Embed Size (px)
Citation preview
OWNER’S MANUALFOR
DUOSEAL® VACUUM PUMPS
MODELS:1400, 1405, 1402,1376, 1397, 1374,1399, 1380, 1392
Contents: InstallationOperationMaintenanceSpecificationDimensional DrawingsParts ListAccessoriesMSDS Sheet for DUOSEAL® OIL
WARNINGNever Block the Exhaust Port.
If the exhaust is blocked, pressure will build-up in the pump with the potential of the pump body bursting and causing
possible injury to personnel in the area.
Welch Rietschle Thomas7301 North Central Ave.Skokie, IL 60077Phone: (847) 676-8800Fax: (847) 677-8606 (Technical Support)Fax: (920) 451-4397 (Ordering)Web Page: www.welchvacuum.com Part No. 67-0777R2.9E-mail: [email protected] Printed in the U.S.A.
CONTENTS
SECTION PAGE1. Installation 3-52. Operation 6-83. Maintenance 9-114. Trouble Shooting Guide 125. Quick Reference Charts 13-146. Pumping Speed Curves 157. Dimensional Drawings (with rotation) 16-178. Exploded Parts Listings 18-319. Accessory Section 32-3310. MSDS Sheet For DUOSEAL® OIL 34
PLEASE READ BEFORE OPERATIONWhile reading your manual, please pay close attention to areas labeled WARNING AND CAUTIONS.
The description of each is found below.
WARNINGWarnings are given where failure to observe instruction
could result in injury or death to people
CAUTIONCautions are found where failure to observe the instruction should
result in damage to the equipment, associated equipment and process.
These units conform to the SI International system of units of measurement.The following symbols (with recommendations of IEC1010) of warning will be found on the pump.
Caution- refer to accompanying documents
Caution- risk of electrical shock
Caution- hot surface
WARNINGMotor includes a self resetting thermal cutout and the pump could restart
without actuation under fault condition.
2
Section 1: INSTALLATION
1.1 IntroductionThis manual has been complied not only for the care and maintenance of the DUOSEAL pump now in yourpossession but as a helpful reference and guide for many problems which are usually associated with mechani-cal vacuum pumps. Take time to read these instructions carefully and preserve this manual for future refer-ence; we think it will be useful to you.
1.2 UnpackingCarefully remove the pump from the shipping case and unfasten and remove the wooden skid. Preserve allpaper work and inspection tags for future reference. If damage has occurred from shipment a claim must befiled with the carrier immediately; preserve the shipping container for inspection by the carrier. If you arerequired to communicate with your dealer or with Welch Vacuum be sure to include your order numbers forquick identification. Do not return the pump to the factory with out first calling for a returned goods number.
1.3 Pump Mounting1.3a Mounted PumpsRubber bumpers are supplied with most of our mounted pumps, either loosely or attached. Bumpers areexcellent for applications involving a semi-flexible surface such as a bench top; they help to isolate noise andeliminate creeping. For more rigid requirements, the pump base may be bolted directly to a firm foundationwith or without the bumpers. All DUOSEAL pumps should be mounted in a horizontal plane.
1.3b Unmounted PumpsIf you have purchased an unmounted pump, refer to parts list for information concerning the motor, motorpulley and belt necessary to drive your particular pump at the recommended speed.
1.4 Pump LocationThe pump should be located preferably in a clean and well ventilated area and adequate space should beprovided wherever possible for routine maintenance such as changes of oil and belt adjustments and replace-ments. Above all, the pump should be located as closely as possible to its system in order to utilize it mostefficiently. Its location should include such determining factors as the length and size of connections, thenumber of bends and the type of exhaust connections.
1.5 Exhaust Provisions (See Accessory section in back of this manual.)Exhaust connections will be determined by the type of system to be exhausted and the desired cleanliness ofthe atmosphere surrounding the pump. Under normal conditions of mild evacuation nothing more than the dustcap will be necessary to cover the port. Where relatively high gas flows are involved or where the presenceof oil vapor is objectionable an exhaust filter may be fastened to the exhaust port in place of the dust cap. Theexhaust filters used on our pumps are capable of absorbing and restricting any vapor particle larger than 0.1micron.
WARNINGNever block the exhaust port. If the exhaust port is blocked, pressure will built-up in the pump with the potential of the pump body bursting
and causing possible injury to personnel in the area.
Where extreme exhaust conditions are encountered it is best to pipe the exhaust direct out of the building.Welch recommended wire reinforced PVC, metal pipe or thick walled rubber hose be used as exhaust lines toavoid potential of line becoming crimped or collapsing resulting in the exhaust port being clocked. Be sure tocall Welch technical service prior to start-up at 847-676-8800 if you have any questions.
3
1.6 Electrical Power
1.6a Power source ReviewReview the power source and the motor rating to be sure they agree in voltage, phase and frequency. On three-phaseapplications the direction of rotation of the motor must be considered. Make a momentary check rotation at the time ofpower installation and wiring. Momentary backward rotation of the pump is not harmful. Check the layout drawings forproper direction of rotation.
CAUTIONMake certain the power settings on the pump match your power
source before attempting to operate the pump
1.6b Overload ProtectionMotor thermal overload protection is made available by the motor manufacturer as an aid to minimizing motor failure.Overload protection is a standard feature on all single-phase 60Hz motors. Single-phase motors will normally haveautomatic overload protection. Motors of 1-1/2 horsepower or larger supplied with DUOSEAL pumps contain nooverload protection. Installations of such equipment must comply with local electrical codes which dictate appropriatestarter and protection devices. It is strongly suggested that you familiarize yourself with the protection supplied withyour motor so that you may react accordingly in the event of an emergency. Automatic reset protection is designed toreset itself after a predetermined cooling period. If the fault to the drive remains unaltered, the motor will cycle on and offuntil the fault is corrected. The motor data plate will indicate the presence of thermal protection.
1.7 Vacuum Connections (See Accessory Section in back of this manual.)1.7a Choice of ConnectionsThe choice of connections and fitting can have a very marked effect on the pumping speed at the vacuum chamber. Anyconnection placed between the pump and the chamber creates an impedance to the flow of gas. This is particularly true atlow pressures in the millitorr range where the gas flow is substantially molecular in character. The gas flow is thendependent upon the kinetic activity of the molecules to bring it to the intake of the pump.
1.7b The Effects of CondutanceIt has been shown that the conductance of a tube is proportional to the cube of its radius and inversely propor-tional to its length. Therefore it is imperative that the connecting lines be as large in diameter and as short inlength as practical. For best results the diameter of the connecting tube should be at least as large as thediameter of the pump intake. To avoid a large reduction in pumping speed at the vacuum chamber, it is clearthat the conductance of the line must be considerably greater than the speed of the pump.
1.7c Metal JointsIf metal piping or tubing is used, it is preferable to solder or braze all of the connections. Where threaded joints must beused, coat the threads with LocTite® Thread Sealant with Teflon®, or Leak Lock and screw together tightly. Flangedconnections with elastomer gaskets make excellent demountable joints. Modular vacuum piping and fittings are nowextensively used.
1.7d Rubber Tubing JointsWhere metal tubing is used between the system and the pump intake, joints can be make by butting the ends of the twosections together in a short section of vacuum hose.Worm-screw band clamps are useful for securing the hose to thetubing.Whatever the joint you choose to use, cleanliness should be of utmost importance.
1.7e Valves and StopcocksMetal valves or stopcocks may be used in the connecting line between the system and the pump to provide a means ofisolating the pump from the system. To minimize the impedance of flow, the valve openings should be as large as possible.Lubricate the rotating plug of the stopcock with a film of vacuum grease sufficiently thick enough to prevent seizure.
4
1.8 Vacuum Gauges (See Accessory section in the back of this manual.)
The type of vacuum gauge to be used is determined largely by the pressure range to be measured. Pressuresin the ranges produced by DUOSEAL pumps can be covered by McLeod, Pirani or Thermocouple gauges.The McLeod gauge is used where high accuracy of measurement is required. The Pirani and Thermocouplegauges are electrical and give continuous readings of the total pressure. There are preferred where rapidpressure changes occur. The McLeod gauge does not measure condensable vapors; therefore, if vapors arepresent it will generally read lower in pressure than electrical gauges. For higher vacuums in systems employ-ing diffusion, turbo-molecular or ion pumps, a hot or cold cathode gauge is used.
1.9 Traps (See Accessory section in the back of this manual.)
1.9a The need for a TrapWhere corrosive vapors or large quantities of condensable vapors are evolved from vacuum processing, a coldtrap may be used in the connecting line to the pump. It will help prevent damage to the pump mechanism andreduce oil contamination. The cold trap, immersed in a suitable Dewar flask, is installed to that the vapors maycome in contact with the surfaces of the trap and condense. Commonly used refrigerants are liquid nitrogenor dry ice and acetone. The refrigerant to be used depends upon the freezing point of the contaminations. Avariety of cold traps are available from Welch Vacuum, Thomas Industries, inc.
1.9b The care of a TrapWhen using a cold trap the refrigerant should be maintained at a high level in the flask to keep the trap at auniformly low temperature. If the trap is re-warmed it may allow re-evaporation of the condensate. Therefrigerant add tube on the liquid nitrogen trap should not be obstructed as the refrigerant boil-off can producedangerously high pressures. If the trap becomes saturated it should be disconnected from the system, drainedand cleaned. An increase in pressure in the vacuum system will normally indicate that the trap has becomesaturated. To clean the trap, remove the trap from the system, allow the trap to warm up and rinse off thecondensate with a suitable solvent in a fume hood. Thoroughly clean and dry the trap before reinstalling in thesystem.
1.10 Types of Lubricants (See Accessory section in the back of this manual.)
All DUOSEAL mechanical vacuum pumps are normally tested with DUOSEAL® oil and shipped with a fullcharge to prevent unnecessary contamination. An additional supply of oil is furnished with each pump withinstruction to drain and discard the oil contaminated in the pump and replace with the fresh oil. DUOSEAL oilhas been especially prepared and is ideally suited for use in mechanical vacuum pumps because of its desirableviscosity, low vapor pressure and chemical stability.
The vacuum guarantee on all DUOSEAL pumps applies only when DUOSEAL oil is used. Other lubricantsfor special applications are available including various lubricants compatibility, lubricants for use with diffusionpumps as well as other special requirements.
5
Section 2: OPERATION
2.1 Starting Procedures
2.1a Starting a DUOSEAL PumpBefore attaching the pump to a system it is well to familiarize yourself with the function and action of thepump which you have now required.Remove the intake and exhaust port plugs and temporarily provide astopper for the intake and a dust cap for the exhaustReview the power requirements as described in Section1.6.
CAUTIONDo not run this pump with the intake open directly to the atmosphere.
The pump will overheat, excessive oil mist will be emitted from theexhaust and the pump will eventually seize.
2.1b Starting of the Model 1392 with Diffusion Pump.1. Turn on Mechanical pump ONLY until a pressure of 100 millitorr or less has been reached.
WARNING Do NOT operate diffusion pump until a pressure of 100 millitorr
has been reached.Turning on the diffusion pump before a pressure of 100 millitorr has been reached will damage your diffusion pump
and may cause serious damage to surroundingequipment and personnel.
2. After a pressure of 100 millitorr had been reached by the mechanical pump, plug in the diffusion pump.Make sure diffusion pump has oil in it at an appropriate level before turning it on. Check the oil indicator sightglass to confirm oil level. Also, make sure that fan is on when operating diffusion pump. Note that it will takethe diffusion pump a few minutes to warm up.Refer to the Varian diffusion pump manual for more information.
2.1c CleanlinessTake every precaution to prevent foreign from entering the pump. A fine mesh screen is provided for thispurpose in the intake passage of all DUOSEAL pumps.
2.1d Oil Level DeterminationThe amount of oil suitable for efficient and satisfactory performance should be determined after the pump hasreached its operating temperature. Initially, however, the pump should be filled with fresh oil while the pump isidle. Fill the pump until the oil level falls half way of the oil level window. If after a short period of operationthe level should fall, it is likely the result of oil entering some of the interior pockets of the pump. If the oil levelrises, this signifies oil has drained into the pump cavity while pump was idle. Shut off pump, then drain oildown to proper level.If a gurgling sound occurs, additional oil must be added. Mechanical pumps will gurgle in varying degreesunder four conditions of performance: [a] when operating at high pressure as in the beginning cycles ofevacuation of a chamber; [b] when the oil level in the pump reservoir is lower than required; [c] when a largeleak is present in the system; and [d] when the gas ballast is open. Awareness of the possibilities will savetime in setting up a system. Best performance of a mechanical pump is generally obtained after sufficient timehas been allowed for the pump to come to operating temperature.
6
2.2 Leak Detection
2.2a Large LeaksThe importance of eliminating all leaks in a vacuum system is obvious when it is realized that a leak into thesystem, at atmospheric pressure, expands in volume by a factor of 750,000 to 10,000,000 or more. The pumpmust remove this added volume to maintain the desired vacuum. Fortunately a number of effective techniquesfor leak detection have been developed. Large leaks can be located by pressurizing the system and paintingthe suspected area with a thick soap solution. Escaping air will produce soap bubbles.
2.2b Small LeaksSmall leaks may also be detected by spraying a suspected area with acetone or gases rich in hydrogen, andobserving a sudden change in pressure on an electrical gauge. The difference in calibration of these gauges,for air and other gases, will produce a distinct change in the pressure reading. To use this method of detection,the system must be under vacuum and the gauge sensing tube must be located between the pump and the areato be probed. Use extreme caution, as these materials are highly flammable!
2.2c Fine LeaksLocating very fine leaks requires a helium-sensitive, mass-spectrometer leak detector. This instrument willlocate leaks which cannot be detected by any other method. Numerous fine leaks can have the total effect ofa large leak.
2.3 High Pressure Operation
DOUSEAL two-stage pumps are designed to be most efficient when operated at or near their ultimateblankoff pressure. The pump is designed to remove air from a vacuum system at atmospheric pressure to adeep vacuum. When the pump is operated at elevated pressures up to about 10 Torr for long periods of time,the pump will run hotter. At elevated ambient temperatures under these conditions, the thermal protectionswitch on single phase motors may cute out. Use of an exhaust filter with coalescing element is required.
CAUTIONDo not run this pump for prolonged periods of time at or above
10 Torr. The pump will overheat, excessive oil mist will be emittedfrom the exhaust and the pump will eventually seize.
Leaky vacuum systems, too large a vacuum chamber for pump size or high gas loads to the vacuum systemsare causes for extended runs of the pump at elevated pressure. If you need additional information, pleasecontact Welch Vacuum at 847-676-8800, extension 1, for further information and precautions.
2.4 Shutdown Procedures
2.4a DuoSeal ShutdownA few simple precautions are all that is necessary when shutdown is in order. If a gauge is connected to thesystem, first isolate the gauge, then turn off the power and open the system to atmosphere. If the pump isremoved from the system, cover the intake port with a rubber stopper or suitable cover to protect the pumpagainst contamination and loose particles. If the pump has been contaminated in service and is going to beshelved for a prolonged period it is best to drain the oil refill with a fresh charge.
7
2.5 the Principle of Gas Ballast
2.5a the Effects of Unwanted Vaporsystems which contain undesirable vapors cause difficulty both from the standpoint of attaining desirable ultimatepressures as well as contamination of the lubricating medium. A vapor is defined as the gaseous form of any substancewhich is usually a liquid or a solid. Water, oil and a mercury vapors are three of the more common vapors encountered intypical vacuum systems. When such vapors exist in a system, the vapors or mixtures of gas and vapor are subject tocondensation within the pump; the precipitated liquid may thus ultimately dissolve or become emulsified with thelubricating medium. This emulsion is recirculated to the chambers of the pump where it is again volatilized causingincreased pressure within the system.
2.5b the Presence and Removal of CondensateCondensation takes place particularly in the compression stroke of the backing or second stage of a two-stage pump.The compression stroke is that portion of the cycle during which the gas drawn from the intake port is compresses to thepressure necessary to expel it past the exhaust valve. Condensation takes place when the ratio between the initialpressure and the end pressure of the compression is high, that is, when the mixture of vapor and gas drawn from theintake port is compressed from a low pressure to high pressure. By adding air though the gas ballast valve to the mixtureof vapor and gas being compressed, the pressure required for delivery past the exhaust valve is reached with a consider-ably smaller reduction of the volume of the mixture; this, depending upon the amount of air added, condensation of thevapor is wither entirely avoided or substantial reduced.
2.5c Pump function With Gas BallastIn a pump functioning on a contaminated system and operating without the gas ballast, compression within the stagetakes place in the normal manner until the saturation pressure of the contaminating vapor contained within the mixture ofgas and vapor is reached. The saturation pressure of water vapor is that pressure and corresponding temperature atwhich the dew point of the vapor is reached and condensation occurs. The saturation pressure of water vapor at anambient temperature of 20°C is 17.5 Torr, while at 60°C, the approximate operating temperature of a pump, the saturationpressure is 149 Torr. The external side of the exhaust valve is subjected to atmospheric pressure. Consequently acompressive force somewhat greater than atmospheric pressure is required to open the valve and permit expulsion of thegas. Sometime during increased compression of the mixture of gas and vapors, the saturation pressure of 149 Torr for thewater vapor is reached and the vapor condenses. The condensate is then allowed to emulsify with the oil which isrecirculated within the pump stages this providing continued contamination of the system.
2.5d Pump function with Gas BallastOn the other hand, when ballast air at atmospheric pressure is supplied to the compression stroke by means of the gasballast, the partial pressure of the unwanted vapor becomes a very small part of the total pressure of the mixture of gas,vapor and newly supplied air. The vapor is thus prevented from reaching its saturation pressure corresponding to thetemperature of the pump and is finally expelled form the pump as a vapor.
2.5e Controlled Ballast FlowSome degree of variation in ballast flow may be obtained by the amount of opening applied tot he gas ballast. Two ormore turns of the gas ballast are sufficient to open it wide. With the gas ballast open, the sound of the exhaust is similarto that of a pump operating against a large leak. Because of the increased pressure introduced into the compressionstroke, the pump must work a little hard to function, thus resulting in an increased operating temperature of approximately8°C over a prolonged period of time. Tests have shown that continuous and prolonged operation for several weeks underthese conditions is not injurious tot he pump.
2.5f Other Forms of contamination controlThe application of the gas ballast is a moderate and very successful method for the removal of condensable vapors. Forvery heavily laden systems, other means of removal such as oil separators may be required. For mild cases of contamina-tion the simple expedient of a cold trap or a change of oil serve the purpose.
8
Section 3: MAINTENANCE3.1 Vacuum Problems3.1a Pressure DeterminationsLeakage, contamination and unusual outgassing are the genera causes of problems associated with poorvacuum. To operate a maximum efficiency a system must be thoroughly clean. If the system is completelyclean and free from leaks, and unwarranted vacuum problems still exist, the pump should be checked. Asimple criterion for the condition of a mechanical pump is a determination of its ultimate pressure capability.This can be accomplished by attaching a gauge directly to the pump. The gauge may be any suitable typeprovided consideration if given tot e limitations of the gauge being used. Refer to Paragraph 1-8 for furthersuggestions. If the pressure is unusually high, the pump may be badly contaminated, low on oil or malfunction-ing. On the other hand, if the pressure is only slightly higher than the guaranteed pressure of the pump, an oilchange may be all that is required.
3.1b Oil Contaminationthe most common cause of a loss in efficiency in a mechanical pump is contamination of oil. It is caused bycondensation of vapors and by foreign particles. The undesirable condensate emulsifies with the oil which isrecirculated and subject to re-evaporation during the normal cycle of pump activity this reducing the ultimatevacuum attainable. Some foreign particles and vapors may form a sludge with the oil, impair sealing andlubrication and cause eventual seizure. A gas ballast calve is helpful in removing vapors, especially water, butit is not equally effective on all foreign substances; therefore, periodic oil changes are necessary to maintainefficient operation of the system. The required frequency of changes will vary with the particular system,.Experiences with the process will help you determine the normal period of operation before an oil changerequired.
3.1c Oil OverheatingThis pump is designed to operate continuously below 10 Torr. Continuous operation of this pump above 10Torr will lead to overheating and eventual pump failure. See Section 2.3. High Pressure Operation.
3.2 Maintenance of the Model 1392 with Diffusion Pump3.2a Determination of an Oil ChangeThe Model 1400 pump of the diffusion-mechanical pump combination may be repaired and maintained asoutlined in the preceding paragraphs, The pump fluid of the diffusion pump should be inspected periodically forcolor change and odor. If the fluid is slightly darkened and had no odor, a simple change of fluid is normally allthat is needed. If the fluid had developed a noticeable odor, the pump should be cleaned. Follow the instruc-tions in the Owner’s Manual for the Diffusion Pump.
3.2b Diffusion Pump Cleaning ProceduresTo clean the diffusion pump, first turn off the power. Turn off the cooling fan and disconnect the power plugafter the diffusion pump has cooled. Disconnect the inlet and foreline connections. Do not scratch or damagesealing surfaces. Remove the cold cap and jet assembly and all O-rings and gaskets. Drain oil from thediffusion pump. Thoroughly clean the diffusion pump body interior and the jet assembly with acetone followedby an isopropyl alcohol rinse. The inside of the pump can be dried using dry nitrogen. Install jet assembly withhe cold cap inside of the pump body. Fill the pump with 30ml of fresh diffusion pump fluid. Reinstall the pumpin the system. For more detailed information and how to replace a burned heater red instructions on the AX-65 Diffusion Pump Instruction Manual supplied with this pump.
WARNING Solvents, such as acetone, used to clean different pumps are extremely hazard
ous. Inhalation may be fatal or harmful. Acetone is also extremely flammable. Never use acetone near heat or open flame. Use only in a well ventilated area.
9
3.3 Oil Changes and Oil Level
3.3a Developing a Maintenance ScheduleAfter studying many examples of pump failure, Welch has found the most common reason is poor condition ofthe oil. This is why a regular maintenance schedule for the oil is critical to obtain the longest service life out ofyour DUOSEAL pump. Welch recommends that you examine the condition of the oil on a daily basis in theearly days of a new process or experiment. You want to look for discoloration of the oil and whether the oillevel is rising. The discoloration can indicate deterioration of the oil and a rising oil level can indicate conden-sation of vapors is occurring in the pump. When changes occur, the oil needs to be change. If no changes inthe oil level or color are observed, extended pump service life is obtained if the oil is changed every three tofour months.3.3b Forced Oil FlushingWhen you drain oil through the drain valve, you are not removing the oil and contaminants that are inside thepumping mechanism. You are removing oil only from the oil case. Welch recommends a forced oil flush ofDUOSEAL pumps be performed at the regular maintenance oil change. The procedure for the forced oilflush is given below.
1. Check the oil level.If the oil level is well above the fill mark, (This may indicate either the pump has been overfilled with oil or hasingested a liquid or a large amount of vapor water or organic solvents.) Please go to step 2.If the oil level is even with the fill mark and you do NOT suspect corrosive gases or particulates (henceforth called contaminants) ingested have damaged the mechanism, run the pump for 15 minutes to allow thepump oil to warm up before going to step 2.
2. Turn off motor for the vacuum pump. Drain the oil into a clear plastic container (may need pliers to opendrain valve). Look for contaminations settling to the bottom of container. If you see contaminants, you willneed to repeat step 3 through 5 several times until the oil comes out clear. The oil you drained from thepump came from the oil case only. There may be contaminants in the pumping mechanism. To be sure allcontaminants have been removed, the pump mechanism needs to be flushed.
3. Make sure the belt guard is installed before proceeding further. Attach a short hose to the drain valve which runs into a clear plastic container.
4. Flushing the pump is carried out by adding a cup of DUOSEAL vacuum pump oil through the intake port (IN) while the pump is turned on for 15 to 20 seconds. While adding the pump oil, the palm of your hand is placed lightly over the exhaust port (OUT). Look for water coming out of the drain. Turn off the pump.
5. Repeat step 4 until clean oil comes out of the drain hose.
6. Fill the pump with the amount of DUOSEAL vacuum pump oil your pump needs.
7. Plug the intake (IN) port with a rubber stopper. Turn the pump on and run the pump for 10 minutes. Close the gas ballast.
8. Check the vacuum reading of the pump by connecting a thermocouple gauge tube to the pump’s intake. If the pump is running nearly as good as when it was new, the total pressure reading you will read on wither of these two gauges will be at least 10 micron.
A simple way to connect the gauge tube to the pump is to run the threaded tip of tube through a hole in arubber stopper. Use pump oil as a lubricant for inserting the tube. The stopper chosen should be bigger thanthe outer diameter of the intake flange.
10
3.3c Refilling The PumpAfter you are satisfied that the pump has been thoroughly flushed, refill the pump by pouring new DUOSEALoil into the exhaust port. Fill to the indicated level and start the pump with the intake closed. A gurgling noiseis characteristic when high pressure air is drawn through the pump. It should disappear quickly as the pres-sure within the pump is reduced. If gurgling continues, add sufficient additional oil through the exhaust portuntil gurgling ceases.3.4 Shaft Seal ReplacementTo replace the shaft seal of a pump, drain the oil and remove the pump pulley and key. Remove the screwssecuring the old seal and pry it loose with a screwdriver or similar wedge, being careful not to mar the surfaceof the pump body against which the seal fits. Discard the seal and its gasket, inspect all surfaces and repairany damages with a fine abrasive stone. Wipe all sealing areas clean and place a film of DUOSEAL oil onboth the shaft and the inside bore of the new shaft seal. Using a new gasket, carefully slide the new seal intoposition and center it on the shaft. It is not necessary to apply any sealant to the gasket. Tighten the mountingscrews uniformly and refill the pump with DUOSEAL oil. Follow instructions included in repair kit.
3.5 Repairing Vacuum Leaks3.5a Location, Cause and EffectOil leaks may develop wherever two mating faces are sealed with a gasket. Such seams may fail as the resultof deterioration of the gasket material, loosening of the screws caused by temperature variations, or impropercare as the result of previous reassembly. Typical gaskets seams in a mechanical pump are located at the oillevel window, the shaft seal, the oil drain, and the mating faces of such mechanical surfaces as the intakechamber cover, the oil case, and the exhaust chamber cover. The importance of a gasketed seam is deter-mined principally by its function. If it is a vacuum seal, the ultimate performance of the pump is dependentupon it. If it is an oil seal, the pump may be operated satisfactorily for some time without loss of function.Eventually, of course, a great loss of oil may cause harmful damage.3.5b Repairing TechniquesAn oil seam may be sealed by any of several methods. When an O-ring is employed, the surfaces of the O-ring and its groove should be wiped clean. If the O-ring is not badly deformed or scratched it may be reusedby sealing with a slight film of vacuum oil or vacuum grease. Thin composition gaskets are generally used forlarge irregularly shaped areas. A replacement joint of this type should be thoroughly cleaned of all previousgasket material and the mating surfaces cleaned of any nicks.
3.6 Repairing Vacuum Leaks3.6a Surface PreparationGood Vacuum seals are an essential and important attribute of a good mechanical pump. A good seal isdependent upon the quality of the mating surfaces as well as the sealant and its preparation. The mating facesshould be carefully inspected for any projections or foreign particles which might interfere with proper mating.Slight projections such as nicks and burrs are most easily removed by rubbing with a fine abrasive stone. Thesurface of the mating parts may be washed with a solvent or alcohol after which they must be thoroughlydried.3.6b Temporary RepairTemporary vacuum repairs are often made by covering the known leak with an industrial sealant such asLoctite with Teflon. Such a practice, however, is not recommended for seals of a permanent nature.3.7 Drive ProblemsIf for any reason the pump will not operate, turn off the power and check the fuse and electrical connections.Then try the power to the motor only by removing the belt. If the motor operates properly try hand-rotatingthe pump in the proper direction with the pump intake port open. If both turn freely then replace the belt andcheck the belt tension. The tension should be sufficient to drive the pump without visible slippage. Anygreater tension will cause noise and possible damage to the bearings of both the motor and pump. Makecertain that both pulley grooves are clean and free from oil. The pulleys must be fastened securely on theirrespective shafts, and in parallel alignment.
11
Section 4: TROUBLE-SHOOTING GUIDE
4.1 Poor Vacuum Reading1. Disconnect vacuum pump from your vacuum system.
2. Obtain 1 gallon of DUOSEAL oil, 1 gallon or larger clear plastic container, clear drain hose (1/4 inch ID by at least 2.5 feet long), rubber gloves, goggles, apron and pliers.
3. Carry out a forced oil flush (See Section 3.3b) if motor can turn pumping mechanism without excessive noise. If pumping mechanism cannot be turned by motor, have pump sent into factory repair center.
4. Check ultimate vacuum with thermocouple gauge. If reading is still unsatisfactory, consult with Welch Technical Service after checking for leaks in your connections.4.2 Noisy Pump
1. Locate noise source on your vacuum pump (motor, belt, pump).
2. If motor makes noise:. Check for loose bolts on motor mount.. Motor may need to be replaced
3. If belt makes noise:. Pulley may be bent. If so, replace.. Loose belt, tighten by loosening bolts on motor and moving motor away from pump until belt
exhibits a 1/2 inch deflection.
4. If pump makes noise: vanes may be sticking, carry out a forced oil flush.
5. If noise level is still unsatisfactory, consult with WELCH Technical Service at (847)676-8800, Extension 1.4.3 Excessive Oil Mist
1. Check oil level. Maintain the level between the two lines on the oil window during operation. Too high a level will cause excess oil mist.
2. Determine the vacuum level in your system with a thermocouple gauge or manometer. Be sure the pump is operating at a pressure of 10 Torr or lower for continuous operation.
CAUTION: if not, discuss application with Welch Technical service before proceeding to prevent oil from overheating and breaking down resulting in the pump failing.
3. A system leak(s) or degassing can cause excessive oil mist. Locate and seal the vacuum leaks. High vapor loads may require a larger pump to compensate.
4. An oil eliminator can be installed for coalescing the oil mist from the exhaust gases. If an oil mist eliminator is already installed, the element may need to be replaced if saturated with oil. Open up oil mist eliminator and examine the element; replace if needed.
5. Check the oil condition for any visible change in color or consistency. contaminants in the oil can add to the amount of oil exhausted. Carry out a forced oil flush if contamination is discovered. (See Section 3.3b.)
12
Section 5: QUICK REFERENCE CHART
13
14
Section 6: PUMPING SPEED CURVES
HIGH EFFICIENCY PUMPING CHARACTERISTIC OF DUOSEAL® PUMPS
The low RPM design of DuoSeal vacuumpumps makes it possible to maintain highpumping efficiencies into the low micron range.High RPM direct drive vacuum pumps, on theother hand, experience a rapid fall off ofpumping speed below 100 microns.
A comparison of the DuoSeal pumping speedcurves shown below, versus high RPM pumpspeed curves conclusively illustrates thesuperior performance of the DuoSeal pump.
What does that mean for the vacuum pump user?DuoSeal pumps provide considerable fasterpumpdown in the low micron range.
15
Section 7: DIMENSIONAL DRAWINGSMounted Pumps
1374B-01 1376B-01
1380B-01 1392B-01
16
1397B-01 1399B-01
1400B-01 1402B-01
1405B-01
17
ITEM
QUA
NPC
. NO
.
A*
B*
DESC
RIPT
ION
011
41-2
074
Pulle
y i
ncl.
item
202
12-
01-9
306
Sock
et
Hea
d Se
t Sc
rew
5/1
6-18
x3/8
031
61-8
378A
Shaf
t Lip
Sea
l Ass
y04
141
-064
3Se
al
Gas
ket
053
2-00
-270
6Fi
l. H
ead
Scre
w 1
0-32
x3/8
061
61-8
685
Larg
e En
d Pl
ate
071
61-8
671
Inta
ke C
over
081
41-0
234
11
Inta
ke C
over
Gas
ket
094
2-01
-611
2So
cket
Hea
d Sc
rew
1/4
-20x
3/4
101
41-1
692
11
Inta
ke S
cree
n11
161
-832
9AIn
take
Scr
een
Bra
cket
126
41-2
363
Was
her
133
2-01
-631
6So
cket
Hea
d Sc
rew
5/1
6-18
x114
141
-061
2D
ust
Cap
151
61-8
468A
Ada
pter
Hos
e16
161
-928
4A1
1O
-Rin
g, F
luor
oela
st.
#21
417
241
-040
32
2O
il C
ase
Gas
ket
1810
62-0
015
Sock
et H
ead
Scre
w 1
/4-2
0x3-
1/8
191
41-0
508
11
Thru
st W
ashe
r20
141
-168
3Sh
aft
211
41-0
624
11
Pulle
y K
ey22
141
-168
8La
rge
Rin
g23
141
-168
2La
rge
Rot
or24
241
-168
42
Larg
e Va
ne25
341
-069
63
3Sp
ring
Hol
der
266
41-1
304
66
Vane
Spr
ing
271
61-8
250C
Cen
ter
Plat
e28
22-
36-9
900
Lock
Nut
1/
4-20
292
2-01
-632
0So
cket
Hea
d Sc
rew
5/1
6-18
x1-1
/430
141
-151
8Ex
haus
t R
otor
312
41-1
487
2Sm
all V
ane
322
41-0
613
22
Woo
druf
f K
ey33
161
-810
8DEx
haus
t R
ing
341
41-2
045
Smal
l En
d Pl
ate
351
41-0
672
End
Cap
361
61-8
310A
Pres
sure
Rel
ease
Tub
e Pa
rt 2
371
4-40
-120
01
1St
eel B
all
ITEM
QUA
NPC
. NO
.
A*
B*
DESC
RIPT
ION
381
41-0
992
1 1
Pres
sure
Rel
ease
Val
ve39
161
-830
9BPr
essu
re R
elea
se T
ube
Part
140
362
-025
9Se
lf Ta
p Sc
rew
#6x
1/4
Type
‘A’
416
2-01
-035
6H
ex H
ead
Scre
w 5
/16-
18x3
-1/2
421
41-2
154
11
Low
er E
xhau
st V
alve
437
2-61
-000
0St
eel
Was
her
1/4
442
2-01
-812
8Se
t Sc
rew
1/4
-20x
1-3/
445
62-
31-0
112
Hex
Nut
1/4
-20x
3/16
x7/1
646
461
-831
4A4
4B
lock
Val
ve47
441
-215
84
4Va
lve
Sprin
g48
241
-215
6Va
lve
Blo
ck49
241
-215
92
2Va
lve
Blo
ck S
pace
r50
161
-810
2AFl
ange
for
Gas
Bal
last
Val
ve51
32-
00-6
712
Sock
et H
ead
Scre
w 1
0-32
x3/4
521
41-1
686
Baf
fle
Plat
e53
241
-217
5Se
t Scr
ew (
Spec
ial)
541
61-8
687
Oil
Cas
e Sp
acer
551
61-8
101
Oil
Cas
e A
ssy
incl
.item
s 63
,67,
72,7
4,75
562
61-8
362
Sock
et H
ead
Scre
w
8-32
x157
161
-810
0AG
as
Bal
last
Val
ve A
dapt
er58
161
-810
31
1O
-Rin
g, F
luor
oela
st.
#905
-75
591
41-1
736
Gas
Bal
last
Val
ve
incl
. ite
m 6
460
661
-845
6AW
ashe
r C
oppe
r 5/
1661
241
-105
6W
ashe
r62
102-
63-0
193
Split
Loc
k W
ashe
r 1/
463
261
-222
9AG
lass
Win
dow
641
41-1
742
11
O-R
ing,
Flu
oroe
last
. #0
1165
341
-176
6Th
rust
D
isk
661
61-8
101A
Gas
Bal
last
Con
nect
or67
161
-227
8D
rain
Val
ve68
141
-275
7Lo
ck N
ut70
12-
01-5
106
Rou
nd H
ead
Scre
w 1
/4-2
0x3/
871
141
-215
31
1U
pper
Exh
aust
Val
ve72
261
-237
0C
over
, W
indo
w73
32-
01-0
316
Hex
Hea
d Sc
rew
5/1
6-18
x174
261
-223
1 2
2O
-Rin
g, F
luor
oela
st.
#127
754
62-1
037
Flat
Hd
Scre
w 8
-32x
7/16
1-99
-528
21
1Se
alan
t, 6
cc14
01D
11
Mec
hani
cal
Seal
opt
ion*
*
A*:
M
AJO
R R
EPA
IR K
IT C
AT #
13
76K
-06
B*:
M
INO
R R
EPA
IR K
IT C
AT #
1
376K
-05
**
1
401D
is m
echa
nica
l sea
l kit
incl
udes
mec
hani
cal s
eal,
gask
et a
nd 3
scr
ews
***
M
AN
OR
REP
AIR
KIT
CAT
# 1
376K
-11
FOR
REF
RIG
EATI
ON
SER
VIC
E PU
MPS
U
SES
NEO
PREN
E SE
ALS
67-
0894
She
et 1
of 2
Rev
. 6 0
1/04
P
AR
TS L
IST
MO
DEL
137
6 VA
CU
UM
PU
MP
18
Section 8: PARTS LISTS & EXPLODED VIEWS
19
ITEM
QUA
NPC
. NO
.
A*
B
*DE
SCRI
PTIO
N1
141
-207
4Pu
lley
inc
l. ite
m 2
21
2-01
-930
6So
c, H
d. S
etsc
rew
5/1
6-18
x3/8
31
61-8
671
Inta
ke C
over
Cha
mbe
r4
42-
01-6
112
Soc
Hd
Scre
w 1
/4-2
0x3/
45
141
-023
4
1
1
Inta
ke
Cov
er G
aske
t6
141
-066
0
1 1
Air
Filte
r7
62-
01-0
316
Hex
Hd
Scre
w 5
/16-
18x1
812
41-2
363
Stee
l W
ashe
r9
141
-066
3A
ir Fi
lter
Bra
cket
103
2-00
-270
6Fi
l H
d Sc
rew
10-
32x3
/811
161
-837
8ASh
aft L
ip S
eal A
ssy.
121
41-0
643
Seal
Gas
ket
1310
2-01
-011
4H
ex H
d. S
crew
1/4
-20x
7/8
1410
2-63
-019
3Sp
lit L
ock
Was
her
1/4
151
61-8
505D
Larg
e En
d Pl
ate
161
41-0
403
1
1
Oil
Cas
e G
aske
t18
161
-846
8AIn
take
Nip
ple
191
61-9
284A
1
1
O-r
ing
#214
201
41-0
508
1
1
Thru
st W
ashe
r21
14-
06-0
754
Ret
aini
ng R
ing
222
41-0
624
2
2
Woo
druf
f K
ey23
141
-177
3Sh
aft
241
41-1
766
1
1
Thru
st D
isk
251
61-8
101
Oil
Cas
e in
cl. i
tem
s 56
, 59,
60,
61,
62
261
41-1
736
1
1G
as B
alla
st V
alve
inc
l. ite
m 2
727
141
-174
2O
-rin
g #
011
282
61-8
362
Soc
Hd
Scre
w 8
-32x
129
241
-105
6A
lum
inum
Was
her
303
2-00
-671
2So
c H
d Sc
rew
10-
32x3
/431
161
-810
2AFl
ange
For
Gas
Bal
last
341
41-1
772
Rin
g
ITEM
QUA
NPC
. NO
.
A*
B*
DESC
RIPT
ION
353
41-1
775
3
3
Low
er E
xhau
st V
alve
363
41-0
695
3
3
Upp
er E
xhau
st V
alve
374
2-61
-000
0St
eel
Was
her
3/16
382
2-01
-510
6R
d H
d Sc
rew
1/4
-20x
3/8
391
61-8
507B
Buf
fle40
32-
31-0
112
Hex
Nut
1/4
-20
411
41-2
175
Spec
ial
Set
Scre
w 1
/4-2
0x2-
1/4
422
41-0
959
2
Vane
434
41-1
304
4
4Va
ne S
prin
g44
141
-177
1R
otor
452
41-1
685
2
2
Vane
Spr
ing
Hol
der
461
41-2
045
Smal
l En
d Pl
ate
471
41-1
005
Pres
sure
Rel
ease
Tub
e N
o.2
481
4-40
-120
0
1
1
Ste
el B
all 3
/849
141
-099
2
1
1Pr
essu
re R
elea
se V
alve
506
2-01
-031
8H
ex H
d Sc
rew
5/1
6-18
x1-1
/851
362
-025
9B
ind
Hd
Shee
t M
et S
crew
#6x
1/4
521
41-0
986
Pres
sure
Rel
ease
Tub
e N
o.1
531
41-0
672
End
Cap
541
41-2
757
Lock
Nut
551
61-8
103
1
1
O-r
ing
#9
0556
241
-375
3O
il Le
vel
Sigh
t57
161
-810
0AG
as
Bal
last
Val
ve A
dapt
er58
161
-810
1AG
as B
alla
st C
onne
ctor
591
61-2
278
Dra
in V
alve
602
61-2
231
1
1
O-R
ing
Tetr.
#12
761
261
-222
8AC
over
, Oil
Win
dow
624
61-2
232
Flat
Hd
Scre
w #
8-32
x1/2
1-99
-528
2
1
1
Sea
lant
, 6 c
c14
01D
1
1M
echa
nica
l Se
al O
ptio
n**
A*:
M
AJO
R R
EPA
IR
KIT
C
AT #
13
80K
-04
B*:
M
INO
R
REP
AIR
K
IT
CAT
#
1380
K-0
3 .
**
1
401D
is m
echa
nica
l sea
l kit
incl
udes
mec
hani
cal s
eal,
gask
et a
nd 3
scr
ews
67
-089
6 s
heet
1 o
f 2
R
ev. 7
-199
8
P
AR
TS L
IST
MO
DEL
138
0 VA
CU
UM
PU
MP
20
21
ITEM
QUA
NPC
. NO
.‘
A*
B*
DESC
RIPT
ION
11
2-01
-930
6Se
t Sc
rew
5/1
6-18
x3/8
21
41-1
492
Pulle
y in
cl.
Item
13
42-
01-6
116
Soc
Hd
Scr
ew 1
/4-2
0x1
41
61-5
074
Shaf
t Lip
Sea
l Ass
y.5
141
-149
4Se
al G
aske
t6
241
-149
0
22
Woo
druf
f K
ey7
141
-148
4Sh
aft
& C
olla
r8
241
-148
6Le
g9
72-
01-6
324
Soc
Hd.
Scr
ew
5/16
-18x
1-1/
210
3841
-236
3St
eel
Was
her
113
41-1
137
Plug
Was
her
122
41-1
136
Plug
131
61-8
770
Larg
e En
d Pl
ate
141
41-0
055
Spac
er15
22-
00-2
704
Fil
Hd
Scre
w
10-3
2x1/
420
42-
01-6
316
Soc
Hd
Scre
w5/
16-1
8x1
212
2-01
-632
0So
c H
d Sc
rew
5/16
-18x
1-1/
423
161
-888
0C
over
Pla
te f
or C
onve
rsio
n Va
lve
241
41-1
508
1
1Va
lve
Gas
ket
251
41-1
736
Gas
Bal
ast V
alve
in
cl. I
tem
45
261
41-2
258
Har
dene
d S
leev
e 1/
4 Si
ze27
161
-853
8A
1 1
Valv
e B
acke
r28
82-
61-0
000
Stee
l Was
her
¼-2
0 B
olt
Size
294
2-31
-011
2H
ex S
teel
Nut
1/4
-20x
7/16
301
41-2
253
Dis
char
ge V
alve
Cov
er31
141
-146
5C
ente
r Pl
ate
321
41-2
161
1
1Ex
haus
t Va
lve
332
2-01
-012
0H
ex H
d Sc
rew
1/
4-20
x1-1
/434
141
-216
4C
over
351
2-01
-813
2H
eadl
ess
Sc
rew
1/
4-20
x236
161
-831
0APr
essu
re R
elea
se T
ube
Part
237
141
-146
1D
efle
ctor
381
61-8
309B
Pres
sure
Rel
ease
Tu
be
Part
139
362
-025
9B
d H
d Sc
rew
#6x
1/4
401
41-1
496
1
1O
il C
ase
Gas
ket
411
41-1
501
Dus
t C
ap42
161
-853
9A
11
Valv
e Fl
appe
r43
182-
01-6
316
Soc
Hd
Scre
w 5
/16-
18x1
451
41-1
742
1
1O
-rin
g #
011
Flu
oroe
last
omer
462
41-3
753
Oil
Sigh
t47
261
-836
2So
c H
d Sc
rew
8-3
2x1
A*:
M
AJO
R
REP
AIR
K
IT
CAT
#
1397
K-0
8B
*:
MIN
OR
R
EPA
IR
KIT
C
AT #
13
97K
-07
ITEM
QUA
NPC
. NO
.
A*
B*
DESC
RIPT
ION
481
61-8
101A
Con
nect
or
for
GB
Val
ve49
562
-022
2So
c H
d Sc
rew
5/1
6-18
x2-3
/450
141
-148
2O
il C
ase
Ass
y. i
ncl
Item
54
& (
2) I
tem
s 46
514
62-0
213
Soc
Hd
Scre
w 5
/16-
18x1
-3/4
521
61-8
102A
Flan
ge F
or G
B V
alve
531
61-8
103
11
O-R
ing
#90
5 F
luor
oela
stom
er54
161
-227
8D
rain
Val
ve55
12-
01-0
344
Hex
Hd
Scre
w 5
/16-
18x2
-3/4
563
2-00
-270
6Fl
at H
d Sc
rew
10-
32x3
/857
141
-067
2Sh
aft
End
Cap
581
41-0
992
1 1
Pres
sure
Rel
ief
Valv
e59
14-
40-1
200
1
1St
eel B
all 3
/8 D
ia60
141
-150
0Sm
all
End
Plat
e61
141
-149
7Ex
haus
t R
ing
621
41-1
499
Exha
ust
Rot
or63
141
-069
6
1
1Sm
all S
prin
g H
olde
r64
241
-130
4
2
2Sm
all V
ane
Sprin
g65
241
-148
7
2
Smal
l Van
e M
etal
662
2-01
-031
6H
ex H
d Sc
rew
5/1
6-18
x167
161
-846
9AIn
take
Nip
ple
681
61-8
475
1
1O
-Rin
g #2
24
Fluo
roel
asto
mer
694
2-01
-631
4So
c H
d Sc
rew
5/1
6-18
x7/8
701
61-8
693
Inta
ke C
ham
ber
711
41-1
495
1 1
Inta
ke C
ham
ber
Gas
ket
721
41-0
937
1
1Sc
reen
Filt
er73
161
-869
1La
rge
Rin
g74
141
-147
8La
rge
Rot
or75
241
-148
9
2 2
Larg
e Sp
ring
Hol
der
764
41-1
488
4
4La
rge
Vane
Spr
ing
772
41-1
477
2
Larg
e Va
ne
Met
al81
141
-151
6
1 1
Key
fo
r Sm
all
Rot
or82
441
-105
6
4
4
Alu
min
um
Was
her
831
41-1
469
1
1Sp
acer
Dis
k84
12-
63-0
193
Split
Loc
k W
ashe
r 1/
485
141
-225
6C
oil
Sprin
g86
141
-225
7H
arde
ned
Slee
ve 5
/16
Size
871
41-2
553
1
1Sp
acer
891
61-8
100A
GB
Val
ve A
dapt
er90
12-
69-7
007
SS W
ashe
r 11
/32x
11/1
6x1/
1691
141
-225
9C
oil
Sprin
g92
141
-275
7Lo
ck N
ut93
141
-216
5G
uard
Stu
d94
261
-871
2
1
1
O-R
ing
#372
Flu
oroe
last
omer
1-99
-528
2
1
1
Seal
ant,
6 cc
1401
F
1
1M
echa
nica
l Se
al
optio
n**
** 1
401F
is
mec
hani
cal
seal
inc
lude
s m
echa
nica
l se
al, g
aske
t an
d 4
scr
ews 67
-089
7 s
heet
1 o
f 2
Rev
. 7
01/0
4
PAR
TS
LIS
T M
OD
EL
1397
/ 137
4 VA
CU
UM
PU
MP
22
23
ITEM
QUA
NA
*B
*PC
. NO
.DES
CRIP
TIO
N1
42-
01-0
308
Hex
Hd
Scre
w
5/16
- 1
8x1/
22
241
-104
9Le
g9
161
-227
8D
rain
Val
ve11
141
-375
3O
il S
ight
12 1
11
41-1
766
Thru
st D
isk
13 1
41-2
378
Oil
Cas
e A
ssy.
inc
l ite
ms
1,2,
9,11
14 1
11
41-1
052
Oil
Cas
e G
aske
t15
41
12-
00-2
706
Fil
Hd
Scre
w
10-3
2x3/
816
141
-067
2Sh
aft
End
Cap
17 1
11
41-1
285
Stee
l W
ashe
r18
42-
01-0
332
Hex
Hd
Scr
ew 5
/16
- 18
x219
441
-236
3W
ashe
r20
141
-237
3En
d Pl
ate
21 1
41-1
042
Inne
r R
ing
22 1
11
41-1
239
Exha
ust
Valv
e23
21
12-
71-0
040
Bra
ss W
ashe
r #1
024
11
141
-237
0Va
lve
Cov
er S
tud
25 1
11
2-65
-000
0Lo
ck W
ashe
r #1
0 Ex
t.26
141
-236
8Va
lve
Cov
er27
22
41-1
059
Vane
28 2
22
41-1
304
Sprin
g29
141
-104
0R
otor
30 1
11
41-1
063
Sprin
g H
olde
r
ITEM
QUA
NA
*B
*PC
. NO
.DES
CRIP
TIO
N31
11
141
-097
4R
etai
ning
Rin
g32
11
141
-061
3W
oodr
uff
Key
33 1
41-2
374
Shaf
t34
11
141
-062
4Pu
lley
Key
35 1
41-1
345
Dus
t C
ap37
161
-846
7AIn
take
Nip
ple
38 7
2-01
-611
2So
c H
d Sc
rew
1/4
-20x
3/4
39 1
41-2
367
Inta
ke C
ham
ber
40 1
11
41-2
375
Cov
er G
aske
t41
141
-236
9In
take
Cha
mbe
r C
over
42 6
2-00
-071
6H
ex H
d Sc
rew
10-
32x1
43 1
41-0
643
Seal
Gas
ket
443
2-00
-671
2So
c H
d Sc
rew
10-
32x3
/445
141
-030
6A
ir Fi
lter
46 1
41-2
371
Air
Filte
r B
rack
et47
11
114
01E
Shaf
t Se
al
incl
. ite
m 4
3 &
(3)
44
**48
12-
01-9
306
Soc
Hd
Set
Scre
w 5
/16-
18x3
/849
141
-219
2Pu
lley
incl
. ite
m 4
850
161
-215
9AO
-Rin
g, #
116,
Flu
oros
eal
11
1-99
-528
2Se
alan
t, 6
cc
A*:
MA
JOR
REP
AIR
KIT
#13
99K
-04
B*:
MIN
OR
REP
AIR
KIT
#13
99K
-03
**
14
01E
is m
echa
nica
l sea
l whi
ch f
its a
ll m
odel
139
9 se
rial n
umbe
rs.
T
here
is a
lips
eal s
eal o
n S/
N 2
5773
and
abo
ve. I
t is
avai
labl
e as
a k
it.
pa
rt no
. 140
1E-0
1
6
7-08
99 s
heet
1 o
f 2Re
v. 3
8/0
1
PA
RTS
LIS
T
MO
DE
L 13
99 V
AC
UU
M P
UM
P
24
25
ITEM
QU
AN
PC.
NO
.A
*B
*D
ESC
RIP
TIO
N1
12-
01-9
306
Soc
Hd
Set
Scr
ew 5
/16
- 18
x3/8
21
41-2
191
Pulle
y in
clud
e. S
et S
crew
, Ite
m 1
31
41-3
696
Shaf
t Se
al4
141
-064
3Sh
aft
Seal
Gas
ket
51
41-0
624
11
Pulle
y K
ey6
141
-106
0Sh
aft
71
41-1
150
11
Ret
aini
ng R
ing
82
41-0
613
22
Woo
druf
f K
ey10
241
-104
9Le
g11
641
-113
8W
ashe
r, C
oppe
r, 7/
16 O
D12
141
-375
3O
il Si
ght
131
41-1
742
11
O-R
ing
#011
141
61-8
540C
Oil
Cas
e*15
141
-134
5D
ust
Cap
161
41-1
052
11
Oil
Cas
e G
aske
t17
92-
01-0
332
Hex
Hd
Scre
w 5
/16
- 18
x218
941
-236
3W
ashe
r19
141
-104
5Ex
haus
t En
d Pl
ate
201
41-1
040
Exha
ust
Rot
or21
141
-123
91
1Ex
haus
t Va
lve
222
2-71
-004
02
2B
rass
Was
her
#10
238
41-1
056
Alu
min
um W
ashe
r24
141
-103
9Ve
nted
Exh
aust
Plu
g25
161
-867
9C
ente
r Pl
ate
261
41-1
285
Stee
l W
ashe
r27
141
-089
01
1A
ir Fi
lter
281
41-0
383
11
Gas
ket
291
41-1
048
Inta
ke C
ham
ber*
*30
161
-846
7AN
ippl
e31
22-
01-0
524
Hex
Hd
Scre
w 3
/8 -
16x
1-1/
232
161
-870
2In
take
End
Pla
te33
161
-867
3En
d C
ap34
52-
00-2
706
Hex
Hd
Scre
w 1
0 -
32x3
/8
ITEM
QU
AN
PC
. N
OA
*B
*D
ESC
RIP
TIO
N35
22-
31-2
521
Hex
Nut
3/
8x16
361
61-8
675
Inta
ke R
ing
371
41-1
041
Inta
ke R
otor
382
41-1
063
22
Sprin
g H
olde
r39
441
-130
44
4Va
ne S
prin
g40
441
-105
94
Vane
(M
etal
)41
52-
01-0
112
Hex
Hd
Scre
w 1
/4 -
20x
3/4
421
41-1
042
Exha
ust
Rin
g43
32-
00-6
712
Soc
Hd
Scre
w 1
0-32
x3/4
441
41-0
578
11
Seal
451
61-8
102A
Flan
ge f
or G
.B. V
alve
461
61-8
103
11
O-R
ing,
Flu
oros
eal
472
61-8
362
Soc
Hd
Scre
w
8 -
32x1
491
61-2
278
Dra
in V
alve
501
2-01
-012
0H
ex H
d Sc
rew
1/4
- 2
0x1-
1/4
511
41-1
736
Vent
ed E
xhau
st V
alve
524
2-01
-030
8H
ex H
d Sc
rew
5/
16 -
18x
1/2
532
2-61
-057
1St
eel
Was
her
.071
Thi
ck x
3/8
ID
541
61-2
159A
O-R
ing,
#11
6, F
luor
osea
l55
141
-106
91
1B
affle
Stu
d56
161
-834
7BEx
haus
t B
affle
571
61-8
100A
Valv
e A
dapt
er58
161
-810
1AC
onne
ctor
591
41-2
757
Loc
knut
601
61-8
665
11
O-R
ing,
M
2.5x
86,
Fluo
rose
al61
12-
00-2
704
Fil
Hd
Scre
w 1
0-32
x1/4
621
61-9
378
11
O-R
ing,
#15
2, F
luor
osea
l63
166
-018
31
1O
-Rin
g, #
120,
Flu
oros
eal
1-99
-528
21
1Se
alan
t 6
cc14
01E
11
Mec
hani
cal
Seal
Opt
ion*
**
*O
il C
ase
Ass
embl
y PT
#61
-854
0C i
nclu
des
Legs
ite
m 1
0, O
il Si
ght,
item
12,
oil
case
,.
Item
14,
Scr
ews,
Ite
m 5
2 &
Dra
in V
alve
, ite
m 4
9**
Inta
ke C
ham
ber
Ass
embl
y PT
#41
-104
8 in
clud
es i
ntak
e ch
ambe
r, ite
m 2
9, n
ippl
e,
It
em 3
0 &
O-
ring,
item
54.
A*:
Maj
or R
epai
r K
it #1
400K
-04
B*:
Min
or R
epai
r K
it #1
400K
-03
***
1401
E is
mec
hani
cal
seal
kit,
it
incl
udes
mec
hani
cal
seal
, gas
ket,
and
3 sc
rew
s
67-0
900
Shee
t 1 o
f 2R
ev. 1
3 8
/01
PART
S LI
STM
OD
EL 14
00 V
AC
UU
M P
UM
P
26
27
ITEM
QTY
PC
. NO
.A
BDE
SCRI
PTIO
N01
161
-811
3CIn
take
Rin
g02
32-
61-0
000
Stee
l W
ashe
r 3
/16
size
033
2-31
-011
2H
ex S
teel
Nut
041
41-2
159
11
Valv
e B
lock
Spa
cer
052
61-8
314A
22
Valv
e06
241
-215
82
2Va
lve
Sprin
g07
12-
01-8
128
Hea
dles
s St
eel S
etsc
rew
081
41-2
156
Valv
e B
lock
091
41-1
742
11
O-R
ing,
Flu
oroe
last
. #0
1110
141
-216
0B
affl
e Pl
ate
111
2-36
-990
0N
ut,
Loc
k 1/
4-20
123
2-00
-270
6Fi
l. H
ead
Scre
w 1
0-32
x3/8
141
41-2
175
Hea
dles
s St
eel S
etsc
rew
151
41-2
092
Inta
ke R
otor
171
61-8
250C
Cen
ter
Plat
e19
22-
01-6
320
Sock
et H
ead
Scre
w 5
/16-
18x1
-1/4
201
41-2
154
11
Low
er E
xhau
st V
alve
211
61-8
310A
Pres
sure
Rel
ease
Tub
e, P
art
222
141
-099
2Pr
essu
re R
elea
se V
alve
236
41-2
363
Was
her
246
2-01
-035
6H
ex H
ead
Scre
w 5
/16-
18x3
-1/2
253
62-0
259
Self
Tap
Scr
ew #
6x1/
4 Ty
pe “
A”
261
61-8
309B
Pres
sure
Rel
ease
Tub
e Pa
rt 1
271
41-0
672
End
Cap
281
4-40
-120
01
1St
eel B
all
3/8
291
41-2
045
Smal
l En
d Pl
ate
301
61-8
108D
Exha
ust
Rin
g31
141
-151
8Ex
haus
t R
otor
326
41-1
304
66
Vane
Spr
ing
332
41-1
487
2Sm
all V
ane
352
41-0
959
2La
rge
Vane
361
41-2
074
Pulle
y in
c. s
etsc
rew
, Ite
m 3
737
12-
01-9
306
Sock
et H
ead
Set S
crew
381
61-8
671
Larg
e En
d Pl
ate
Cov
er39
141
-215
31
1U
pper
Exh
aust
Val
ve40
12-
01-5
106
Rd.
Hea
d St
eel S
crew
1/4
-20x
3/8
414
2-01
-611
2So
cket
Scr
ew 1
/4-2
0x3/
4
ITEM
QTY
PC
. NO
.A
BDE
SCRI
PTIO
N42
141
-023
41
1In
take
Cha
mbe
r C
over
Gas
ket
431
61-8
329A
Air
Filte
r B
rack
et44
62-
01-0
316
Hex
Hea
d C
ap S
crew
5/1
6-18
x145
141
-061
2D
ust
Cap
461
61-8
468A
Inta
ke N
ippl
e47
161
-928
4A1
1O
-Rin
g, F
luor
oela
st.
#214
481
41-0
403
11
Oil
Cas
e G
aske
t49
261
-223
12
2O
-Rin
g, F
luor
oela
st.
#127
501
61-8
102A
Flan
ge F
or G
.B. V
alve
511
41-1
736
Gas
Bal
last
Val
ve52
261
-836
2So
cket
Hea
d Sc
rew
8-3
2x1
531
61-8
101
Oil
Cas
e A
ssy,
in
cl. 4
9,56
,59,
76 ,7
754
141
-275
7Lo
ck N
ut55
161
-810
31
1O
-Rin
g, F
luor
oela
st.
#905
-75
562
61-2
229A
Win
dow
Gla
ss57
161
-810
0AG
as
Bal
last
Val
ve A
dapt
er58
161
-810
1AG
as B
alla
st V
alve
Con
nect
or59
161
-227
8D
rain
Val
ve60
661
-845
6A6
6W
ashe
r C
oppe
r 5/
1661
241
-105
6W
ashe
r62
241
-061
32
2W
oodr
uff
Key
631
41-2
093
Shaf
t64
241
-062
42
2W
oodr
uff
Key
651
41-0
508
11
Thru
st
was
her
661
61-8
668
Larg
e En
d Pl
ate
6710
2-63
-019
3Sp
lit L
ock
Was
her
6810
2-01
-011
4H
ex H
ead
Cap
Scr
ew 1
/4-2
0x3/
469
141
-066
01
1A
ir Fi
lter
701
41-0
643
Seal
Gas
ket
711
61-8
378A
Shaf
t Lip
Sea
l Ass
y.72
341
-168
53
3Sp
ring
Hol
der
- In
take
733
41-1
766
33
Thru
st D
isc
741
4-06
-075
41
1Tr
uarc
Rin
g75
32-
00-6
712
Sock
et H
ead
Scre
w 1
0-32
x3/4
762
61-2
370
Cov
er, O
il W
indo
w77
462
-103
7Fl
. Hea
d Sc
rew
8-3
2x7/
161-
99-5
282
11
Seal
ant,
6 cc
1401
D1
1M
echa
nica
l Se
al o
ptio
n**
A
*:
MA
JOR
REP
AIR
KIT
CAT
#
1402
K-0
6
B*:
M
INO
R R
EPA
IR K
IT C
AT #
1
402K
-05
**
140
1D is
mec
hani
cal s
eal k
it in
clud
es m
echa
nica
l sea
l, ga
sket
and
3 s
crew
s67
-090
5S
heet
1 o
f 2
Rev
. 6 1
1/02
PA
RTS
LIS
TM
OD
EL 1
402 V
AC
UU
M P
UM
P
28
29
ITEM
QUA
NPC
. NO
.
A*
B*
DESC
RIPT
ION
11
61-8
651
Inta
ke R
ing
23
2-61
-000
0St
eel
Was
her
3/1
6 si
ze3
32-
31-0
112
Hex
. Ste
el N
ut4
141
-215
9
1 1
Valv
e B
lock
Spa
cer
52
41-2
157
2
2Va
lve
62
41-2
158
2
2Va
lve
Sprin
g7
12-
01-8
128
Hea
dles
s St
eel S
et S
crew
81
41-2
156
Valv
e B
lock
91
41-1
742
1
1O
-Rin
g #
011
101
41-2
160
Baf
fle
Plat
e11
12-
36-9
900
Nut
, Lo
ck
1/4
-20
123
2-00
-270
6Fi
l. H
d. S
crew
10
-32x
3/8
141
41-2
175
Hea
dles
s St
eel S
et S
crew
151
41-2
092
Inta
ke R
otor
171
61-8
250C
Cen
ter
Plat
e19
22-
01-6
320
Sock
et
Hd.
Scr
ew
5/16
-18x
1-1/
420
141
-215
4
11
Low
er E
xhau
st V
alve
211
41-1
005
Pres
sure
Rel
ease
Tub
e, P
art
222
141
-099
2
11
Pres
sure
Rel
ease
Val
ve23
641
-236
3W
ashe
r24
62-
01-0
356
Hex
. Hd
Scr
ew
5/16
-18x
3-1/
225
362
-025
9Se
lf Ta
p S
crew
#6x
1/4
Type
“A
”26
141
-098
6Pr
essu
re R
elea
se T
ube
Part
127
141
-067
2En
d C
ap28
14-
40-1
200
1
1Ste
el B
all
3/8
291
41-2
045
Smal
l En
d Pl
ate
301
61-8
108D
Exha
ust
Rin
g31
141
-151
8Ex
haus
t R
otor
326
41-1
304
2
2Va
ne S
prin
g33
241
-148
7
2Sm
all V
ane
341
41-0
696
1
1Va
ne S
prin
g H
olde
r-Ex
haus
t35
241
-095
9
2La
rge
Vane
361
41-2
074
Pulle
y in
c. S
et S
crew
, Ite
m 3
737
12-
01-9
306
Sock
et H
ead
Set
Scr
ew38
161
-867
1La
rge
End
Plat
e C
over
391
41-2
153
1
1U
pper
Exh
aust
Val
ve40
12-
01-5
106
Rd.
Hd.
Ste
el S
crew
1/
4-20
x 3/
841
42-
01-6
112
Sock
et S
crew
1/
4-20
x3/4
421
41-0
234
1
1In
take
Cha
mbe
r C
over
Gas
ket
431
41-0
663
Air
Filte
r B
rack
et44
62-
01-0
316
Hex
Hea
d C
ap S
crew
5/1
6-18
x145
141
-061
2D
ust
Cap
ITEM
QUA
NPC
. NO
.
A
*B
*DE
SCRI
PTIO
N46
161
-864
1In
take
Nip
ple,
(7/
16 H
ose
I.D.)
471
61-9
284A
1
1
O-r
ing,
#21
448
141
-040
3
11
Oil
Cas
e G
aske
t49
261
-223
1
11
O-r
ing
Tetr.
#12
750
161
-810
2AFl
ange
For
G.B
. Val
ve51
141
-173
6G
as B
alla
st V
alve
522
61-8
362
Soc.
Hd
Scre
w 8
-32x
153
161
-810
1O
il C
ase
Ass
y,
incl
. Ite
ms
49,5
6,59
,76
,77
541
41-2
757
Lock
Nut
551
61-8
103
1
1O
-rin
g56
261
-222
9AW
indo
w G
lass
571
61-8
100A
Gas
B
alla
st V
alve
Ada
pter
581
61-8
101A
Gas
Bal
last
Val
ve C
onne
ctor
591
61-2
278
Dra
in V
alve
606
61-8
456A
6
6
Was
her
Cop
per 5
/16
612
41-1
056
Was
her
622
41-0
613
2
2W
oodr
uff
Key
631
41-2
093
Shaf
t64
241
-062
4
11
Woo
druf
f K
ey65
141
-050
8Th
rust
w
ashe
r66
161
-866
8La
rge
End
Plat
e67
102-
63-0
193
Split
Loc
k W
ashe
r68
102-
01-0
114
Hex
Hea
d C
ap S
crew
1/
4-20
x3/4
691
41-0
660
1
1A
ir Fi
lter
701
41-0
643
Seal
Gas
ket
711
61-8
378A
Shaf
t Lip
Sea
l Ass
y..
722
41-1
685
2
2Sp
ring
Hol
der
- In
take
733
41-1
766
3
3Th
rust
Dis
c74
14-
06-0
754
1
1
T
ruar
c R
ing
753
2-00
-671
2So
c H
d Sc
rew
10-
32x3
/476
261
-222
8AC
over
, Oil
Win
dow
774
61-2
232
Fl H
d Sc
rew
8-3
2x1/
21-
99-5
282
1
1
Seal
ant,
6 cc
1401
D
1
1
M
echa
nica
l Se
al K
it op
tion
**A
*:
MA
JOR
REP
AIR
K
IT
CAT
#
1402
K-0
6B
*:
MIN
OR
REP
AIR
K
IT
CAT
#
1402
K-0
5**
1
401D
is m
echa
nica
l sea
l kit
incl
udes
mec
hani
cal s
eal,
gask
et a
nd 3
scr
ews.
67-
0906
Sh
eet
1 of
2R
ev.
7-98
PA
RTS
LIS
TM
OD
EL 1
405 V
AC
UU
M P
UM
P
30
31
Section 9: ACCESSORY SECTION
32
33
34
Section 10: MSDS SHEET
35
37
38
39
40
NOTES:
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
41
WARRANTYUNPACKINGInspect the pump carefully. If any damage has occurred, file claim with the carrier immediately. Save the shippingcontainer for carrier to inspect.
OPERATING PUMPRefer to the enclosed Instruction/Operation Manual for all information to properly operate and maintain thepump.
WARRANTYThis Welch Vacuum product is warranted to be free from defects in material and workmanship. The liability ofWelch Rietschle Thomas under this warranty is limited to servicing, adjusting, repairing or replacing any unit orcomponent part which in the judgment of Welch Rietschle Thomas has not been misused, abused or altered in anyway causing impaired performance or rendering it inoperative. No other warranties are expressed or implied.The method of executing this warranty: servicing, adjusting, repairing or replacing shall be at the discretion ofWelch Rietschle Thomas. Vacuum pumps that have been used for any period, however short, will be repairedunder this warranty rather than replaced.
The warranty is effective for one year from the date of original purchase when:
1. The warranty card has been completed and returned.2. The product is returned to the factory or other designated service centers, freight prepaid.3. The product in our judgment is defective through no action or fault of the user.
If the product has become defective through misuse, abuse, or alteration, repairs will be billed regardless of theage of the product. In this event, an estimate of the repair costs will be submitted and authorization of thesecharges will be required before the product is repaired and returned.
To reduce additional charges and delays either within or outside of the warranty period, contact WelchRietschle Thomas @847-676-8800 for a return authorization number. Products without a return authorizationnumber will be refused by our receiving department. Before shipping, properly pack the pump, insure it againstloss or damage, and on the outside of the pump packaging and the packing slip write in the return authorizationnumber. Pumps damaged due to improper packaging are the customer’s responsibil-
Vacuum Pump Repair Facility7301 North Central Ave.Skokie, Illinois 60077Phone: (847) 676-8800 Ext. 1Fax: (847) 677-8606
OWNER’S MANUALFor
DUOSEAL VACUUM PUMPSMODELS 1374, 1376, 1392, 1380, 1399, 1400, 1402, &1405
Part No. 67-0777Copyright®1993-2004 Welch Rietschle ThomasDUOSEAL and Welch are registered trademarks of Welch Rietschle Thomas.
42
![Link Reversal Algorithms Jennifer L. Welch [Welch and Walter, 2012]](https://img.dokumen.tips/doc/110x75/551be0e9550346c3588b5d98/link-reversal-algorithms-jennifer-l-welch-welch-and-walter-2012.jpg)
