Specification Section 061053 remove paragraph 2.1.A

Item No. 8: Specification Section 061053

Specification Section 061053 remove paragraph 2.1.A.

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Specification Section 061600 remove paragraph 2.1.A. and 2.1.B.


Add the attached specification section 230523 “Valves for HVAC Piping”.


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Replace Operations Training/ Dining Hall Fort Indiantown Gap Air Guard Station – Fort Indiantown Gap, PA

VALVES FOR HVAC PIPING 230523 - 1

SECTION 230523 - VALVES FOR HVAC PIPING

PART 1 - GENERAL

1.1 STIPULATIONS

A. The specifications sections “General Conditions of the Construction Contract”, “SpecialConditions”, and “Division 1 - General Requirements” form a part of this Section by thisreference thereto, and shall have the same force and effect as if printed herewith in full.

1.2 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and SupplementaryConditions and Division 01 Specification Sections, apply to this Section.

1.3 SUMMARY

A. Section Includes:

1. Gate valves.2. Plug valves.3. Chainwheel operators.4. Drain valves.5. Balancing valves.6. Globe valves.7. Check valves.8. Butterfly valves.9. Electric motor operators and limit switches.10. Solenoid valves.11. Automatic safety shut off valves.12. Gas cocks.13. Pressure sustaining valves.

1.4 ACTION SUBMITTALS

A. Product Data: For each type of valve.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Prepare valves for shipping as follows:

1. Protect internal parts against rust and corrosion.2. Protect threads, flange faces, grooves, and weld ends.3. Set angle and globe valves closed to prevent rattling.



B. Use the following precautions during storage:

1. Maintain valve end protection.2. Store valves indoors and maintain at higher-than-ambient dew point temperature. If

outdoor storage is necessary, store valves off the ground in watertight enclosures.

C. Use sling to handle large valves; rig sling to avoid damage to exposed parts. Do not usehandwheels or stems as lifting or rigging points.

PART 2 - PRODUCTS

2.1 GENERAL REQUIREMENTS FOR VALVES

A. Source Limitations for Valves: Obtain each type of valve from single source from singlemanufacturer.

B. ASME Compliance:

1. ASME B1.20.1 for threads for threaded-end valves.2. ASME B16.1 for flanges on iron valves.3. ASME B16.10 and ASME B16.34 for ferrous valve dimensions and design criteria.4. ASME B31.1 for power piping valves.5. ASME B31.9 for building services piping valves.

C. Refer to HVAC valve schedule articles for applications of valves.

D. Valve Sizes: Same as upstream piping unless otherwise indicated.

E. Valves in Insulated Piping: With 2-inch stem extensions.

F. The valves and accessories shall be in the quantity, quality, types, and sizes as indicated on theContract Drawings and specified herein.

G. All valves shall have a minimum design pressure rating of 150 psi and capable of a test pressureof 300 psi. Valves above grade shall have flanged or threaded ends. Buried service valves shallhave mechanical joint pipe ends.

H. Operation:

1. Cast iron parts of valves shall meet the requirements of ASTM Designation A126,"Standard Specifications for Gray Iron Castings for Valves, Flanges and Pipe Fittings,Class 'B' “. Flanged ends shall be flat faced and have bolt circle and bolt patternsconforming to ANSI B16.1 Class 125 unless otherwise specified hereinafter. All castingsshall be clean and sound, without defects of any kind and no plugging, welding orrepairing of defects will be permitted. All bolt heads and nuts shall be hexagonalconforming to ANSI B18.2. The materials for the nuts, bolts, and washers shall conformto the specifications for the connecting piping. Gaskets shall be full face and made ofnatural or synthetic elastomers in conformance with ANSI B16.21 suitable for the servicecharacteristics especially chemical compatibility and temperature. Non ferrous alloys of



various types shall be used for parts of valves as specified. Where no definite specification is given, the material shall be the best for that particular application.

2. Operation of valves and gates shall be designed so that the effort required to operate thehandwheel, lever or chain shall not exceed 40 pounds applied at the extremity of thewheel or lever. The handwheels on valves 14 inches and smaller shall not be less than 8inches in diameter, and on valves larger than 14 inches the handwheel shall not be lessthan 12 inches in diameter.

3. Except where noted otherwise, all interior and exposed valves shall be handwheel orlever operated if the centerline of the valve operator is within 6 feet of the floor orplatform from which it is to be operated, and chain wheel operated if the vertical distanceis greater than 6 feet unless otherwise shown on the Contract Drawings. Chains shallextend to within 3 feet from the operating floor.

4. All operators, unless otherwise specified, shall turn counter clock wise to open.Operators shall have the open direction clearly and permanently marked. All valveoperators, manual and pneumatic, shall be provided with the valve by the valvemanufacturer. The Contractor through the valve manufacturer shall be solely responsiblefor the selection of the proper operator to meet the operating conditions specified herein.Field calibration and testing of the operators and valves to ensure a proper installationand an operating system shall be the responsibility of the Contractor.

5. Levers shall be provided at each lever operated valve.6. All valves for which status indication is required according to the instrumentation

drawings and specifications, shall be provided with factory-mounted, standard designintegral end switches in NEMA 12 enclosures.

I. All valves shall have applied to them the same coatings as the adjacent piping.

J. All raised face flanges in conformance with ANSI B16.5 Class 150 shall be milled flat.

2.2 GATE VALVES (SMALLER THAN 3”)

A. Shall be bronze, rising stem, screwed bonnet, solid wedge gate valve with threaded endconnections conforming to Federal Specifications WW-V-54 Class B Type 11 for nominal pipesizes up to 2-1/2 inches.

B. Shall be nominal Class 150.

C. Shall be Model No. 431 by Crane, No. 56 by Walworth or approved equal.

D. Hot water service valves shall be designed for 250 degrees F service.

2.3 GATE VALVES (3” AND LARGER)

A. For interior and exposed piping with nominal pipe sizes of 3 inch and larger, shall be doubledisc gate valves conforming to AWWA C500 for the potable quality water lines, identified asService Water SW, Domestic Water CW, and for all other services, Class 125 pound, iron body,bronze mounted solid wedge gate valves. Except where noted on the Contract Drawings, allgate valves for interior and exposed piping shall be outside screw and yoke type (OS&Y) andshall be provided with packing. The packing shall conform to the requirements of AWWAC500.



B. Hot water service valves shall be designed for 250 degrees F service.

C. All interior and exposed piping valves shall be provided with flanged ends conforming to ANSIB16.1 Class 125.

D. Solid wedge gate valves for interior and exposed service shall be Model 465 1/2 by Crane,Model G623 by Stockham or approved equal for OS&Y type and Model 461 by Crane, ModelG612 by Stockham or approved equal for NRS type.

E. Non rising stem valves for interior and exposed piping shall be provided with a disk positionindicator.

F. For interior and exposed service valves shall be provided with handwheels.

G. Shall be rated for a working pressure of 200 psi.

2.4 PLUG VALVES

A. General:

1. Shall be of the non lubricated, eccentric plug type with elastomer faced plugs equivalentto series 100 models as manufactured by DeZurik Company, or approved equal. Theconstruction of the valve shall require the opening movement of the valve to cause theplug to rise off the seat contact rather than sliding from its seat.

2. Shall have minimum port area of 85 percent for nominal pipe sizes 4 inch and larger.3. Shall be provided with limit stops and rotate 90 degrees from fully open to fully closed.4. Shall be capable of providing shut off up to the full working pressure rating in either

direction.5. Shall be rated for 175 psi pressure.6. Shall be bolted bonnet design.7. Shall, for interior and exposed service with nominal pipe sizes 6 inch and less, be

provided with lever operators.8. Shall, for interior and exposed service with nominal pipe sizes 8 inch and larger, be

provided with totally enclosed worm gear actuators. The actuators shall be properly sizedto suit the maximum differential across the valve.

9. All exposed nuts, bolts, springs, washers, etc. shall be corrosion resistant material.10. Shall have the standard face to face dimensions of AWWA gate valves with flanged end

connection.

B. Valve Body:

1. Shall be ASTM A126 Grade B cast iron.

C. Valve Plug:

1. Shall be ASTM A126 Grade B cast iron or ductile iron A536 Class 65 covered with Buna-N or nitrile for general service. For natural gas service, the covering shall be HYCAR.

D. Valve Seats:



1. Shall be corrosion resistant consisting of a welded in overlay of 90 percent pure nickel orstainless steel mechanically attached to the valve body.

E. Valve Bearings:

1. Shall be replaceable type 316 series stainless steel for both the upper and lower journalsor of phenolic backed or fiberglass backed worn Teflon bearings to prevent debris fromentering journals.

F. Shaft Seals:

1. Shall be multiple ring V type Buna N packing. The stuffing box shall be designed toallow the packing to be adjusted and replaced when the valve is in service.

G. Gear Actuators:

1. Shall be totally enclosed worm gear type.2. Shall have permanently lubricated bearings.3. Shall be designed to handle the seating and unseating torque at the specified handwheel

pull for applications with the maximum pressure differential in either direction.4. Shall be equipped with a handwheel for interior and exposed service.5. Shall clearly indicate valve position with an adjustable stop to set closing.

2.5 CHAINWHEEL OPERATORS

A. Shall be provided where specified herein.

B. Shall be fabricated of malleable iron.

C. Shall be pocketed type chain wheels with chain guards and guides.

D. Shall have galvanized smooth welded link type chain. Chain that is crimped or has links withexposed ends shall not be acceptable.

E. Shall be marked with an arrow and the word "open" indicating direction to open.

2.6 DRAIN VALVES

A. The drain valves shall be ball type, 90 degree turn lever operated with threaded ends and hoseadapter. Ball valves shall be rated for a minimum working pressure of 150 psig. Ball valvesshall be of bronze construction with seat and seal materials suitable for hot water service.Valves shall be manufactured by WKM, Jamesbury, Apollo, or approved equal.

2.7 BALANCING VALVES 12 INCHES AND SMALLER

A. Valves shall be constructed for 175 lbs. working pressure at 250 degrees F, with threaded orflanged ends. All valves up to 3 inch pipe size to be of bronze body/brass ball construction withglass and carbon filled TFE seat rings. Valves 4 inches and larger shall be fitted with bronzeseat, replaceable bronze disc with EPOM seal insert and stainless steel stem. Valves to have



differential pressure read out ports across valve seat area. Read out ports to be fitted with the internal EPT inserts and check valves. Valve bodies to have 1/4 inch NPT tapped drain/purge port. Valves to have memory stop feature to allow valve to be closed for service and then reopened to set point without disturbing balance position. All valves to have calibrated name plates to assure specific valve settings. Valves to be leak tight at full rated working pressure. All valves to be provided with molded insulation to permit access for balance and read out. Valves shall be Bell & Gossett Model CB or approved equal.

2.8 GLOBE VALVES LESS THAN 3 INCHES

A. Valves shall be of brass, rising stem, with threaded ends and composition discs, and shall beconstructed for 150 lbs. W.S.P. The discs shall be suitable for use with hot water up to 300degrees F. Valves shall be Crane Co. with No. 1 Cranite discs, or approved equal.

2.9 GLOBE VALVES 3 INCHES AND LARGER

A. Valves shall have iron bodies and bonnets, rising stem, flanged ends and composition discs, andshall be constructed for 125 lbs. W.S.P. the discs shall be suitable for use with hot water up to300 degrees F. Valves shall be Crane Co. with No. 1 Cranite discs, or approved equal.

2.10 CHECK VALVES LESS THAN 3 INCHES

A. Valves shall be brass, swing type allowing full diameter passage with threaded ends and brassdiscs, and shall be constructed for 125 lbs. W.S.P. Valves shall be Crane Co. No. 37, orapproved equal.

2.11 CHECK VALVES 3 INCHES AND LARGER

A. Valves shall be IBBM swing type allowing full diameter passage with flanged ends and brass orbrass-faced cast iron discs, and shall be constructed for 125 lbs. W.S.P. Valves shall be CraneCo. No. 373, or approved equal.

2.12 BUTTERFLY VALVES

A. General

1. Shall be the product of one manufacturer.2. Shall meet the full requirements of AWWA C504 except as modified or supplemented

herein.3. Shall be wafer or luged body design for interior and exposed piping.4. Valve discs shall operate through a 90 degree angle from full closed to full open position.5. Actual port diameter cannot be less than 1 inch smaller than the nominal pipe size to

which it is attached.6. Disc position stops located in the valve body are not acceptable.7. Shall be equipped with adjustable mechanical stop limiting devices in the operator to

prevent over travel of the valve disc in the open and closed position.8. All butterfly valves shall be Model HP as manufactured by DeZurik or approved equal.



B. Valve Bodies

1. Shall be constructed of ASTM A515 or A516 Grade 70 for 20 inches and smaller andASTM A216 WCB for larger than 20 inch carbon steel.

C. Valve Discs

1. Shall be 316 stainless steel ASTM A351.2. Shall be provided with carbon steel ASTM A515 or A516 seat retainer.

D. Valve Shafts

1. Shall be type 316 stainless steel ASTM A479.2. Shall be 1 piece.

E. Valve Seats

1. Shall be PTFE for 250 degrees F hot water piping services.2. Shall be a full 360 degree without interruption and field adjustable around the full

circumference of the valve body.3. Shall be replaceable without dismantling operator, disc or shaft and without removing the

valve from the line. Manufacturer shall certify that the valve seat is field replaceable.4. Retaining segments and screws if used shall be type 316 stainless steel.

F. Valve Bearings

1. Shall be 317 stainless steel with PTFE woven fabric.

G. Valve Shaft Seals

1. Shall be V-Flex style PTFE packing.2. Shall be the same elastomer as specified for the valve seats for the intended service.

H. Operators

1. Shall be of rotary for manual operation or electric actuator as required and shown on theContract Drawings.

2. Shall be totally enclosed and permanently lubricated.3. Shall have a gear ratio and handwheel diameter designed to produce an output torque

equivalent to the maximum valve shaft torque required to operate the valve under actualline pressures, velocities and flow direction with a maximum pull of 40 pounds on thehandwheel. Manufacturer shall submit calculations verifying compliance with thisstandard.

4. Shall be provided by the valve manufacturer.

2.13 ELECTRIC MOTOR OPERATORS AND LIMIT SWITCHES

A. All motorized valves and valves with limit switches shall be furnished by the valvemanufacturers as a complete package. Motor driven valve operators and limit switches shall befurnished and installed in accordance with the applicable requirements shown on the control and



instrument diagrams and electrical elementary diagrams. Operators shall comply with AWWA requirements for electric operators.

B. Electric operators including the motor, all required gearing, integral solid state reversing starter,controls and switches shall be as manufactured by Limitorque Corp., Auma, Eim, or approvedequal.

C. The motorized operators for modulating service shall be furnished with an integral positionindicator/transmitter/controller. The above unit shall be internally powered, factory calibratedand furnished with adjustable zero, span, gain and deadband controls.

D. The position controller shall accept a linear 4-20mA, 24 VDC input signal proportional to 0-100percent travel span and shall generate appropriate outputs to the solid state reversing starter toopen/close the valve or gate until the desired position has been reached as determined by theposition feedback signal.

E. The controller shall be furnished with circuitry to "lock-in-the-last-position" upon loss ofcontrol signal. The Contractor shall be responsible for proper transmitter/controller calibrationin accordance with the manufacturer's recommendations.

F. Operator capacity shall be adequate to operate the valve under all operating conditions with aminimum of 25 percent reserve capacity above the highest required torque. Operators shall becapable of normal operation at ambient temperatures from -20 degrees F to 150 degrees F.Unless otherwise indicated, or specified, motor operators shall be furnished complete withmotors, limit switch operating mechanisms, travel limit switches, torque switches, transmitters,controllers, starters, terminal blocks, gear reducers, handwheel, gearing, necessary components,wall mounted control panels and incidental accessories as follows:

1. Enclosure:

a. The starter and control housing for 460 volt motor operators and all local devicesshall be mounted in a common NEMA 4 enclosure. The enclosure shall bepermanently affixed to the valve operator housing.

2. Valve Stops:

a. Valve stops for the operators shall be positive in action. Closing shall becomplete, and opening full. Stops shall be field adjustable to the required settings.The torque switches shall prevent any excessive mechanical stress or electricaloverload in any direction of travel.

b. Limit switches and gearing shall be an integral part of the motorized valveoperator. Where required for a 460 volt motor driven operator, the limit switchgearing shall be of the intermittent type, totally enclosed in its own gear case,grease lubricated to prevent dirt and foreign matter from entering the gear train andshall be made of bronze. Limit switches shall be of the adjustable type capable ofbeing adjusted to trip at any point between the normal position (full open, or fullclosed) and 75 percent of the travel to the opposite position.

3. Local (Motor) Devices:

a. Local devices shall include, but not be limited to the following:



1) Torque Switches: Torque switches, responsive to high torque encounteredin either direction of travel. A torque switch which has actuated due tomechanical load shall not reset when the operator motor has come to a halt.Torque switches shall operate during the entire valve cycle without the useof auxiliary relays, linkages, latches or other devices and shall stop the valveoperation in the direction of the overload. For 120 volt motor operators,torque switches are required for torque seated valves only, e.g., plug valves,and gate valves.

2) Limit Switches: Travel limit switches, for opening and closing direction oftravel. Contact operations shall be as indicated on the Drawings. If notshown on the Drawings, the operator shall be furnished with a minimum ofeight DPDT (SPDT for 120 volt motor operator) switches. Limit andauxiliary switches shall be capable of field adjustment to actuate at anypoint of travel. All switches shall be furnished with 5 ampere snap actioncontacts operated by cams in a stack arrangement. Switches shall beconnected such that when the valve is fully open, or fully closed, the "open"or "close" light shall be illuminated and both lights shall be illuminatedduring travel. All limit switch contacts shall be wired out to a terminal stripso that the electrician in the field does not have to connect to the switches.

3) Local/Workstation selector switch with monitor relay to provide drycontacts for collective indication of placement in the "remote" operatingmode, the unit is powered, and that all safety/overload interlocks aresatisfied. All conditions must be satisfied to provide the above signal. Forfurther requirements refer to electrical elementary control schematics,Instrumentation drawings and Specifications.

4) Open/stop/close selector switch with spring return to the stop position forlocal manual operation (modulating service) or open/close selector switch(open/close service).

5) Power on, running, full open, full closed and overload pilot lights.6) Remote mounted local control panels (LCP) containing the control and

indicating devices described in b, c, d, and e above. The panel shall be ratedNEMA 4 and shall be constructed of stainless steel with provisions for wallmounting. Control and indicating devices shall be heavy duty 30.5 mmtype. Panels shall be provided in accordance with Specification 230923“Direct Digital Control (DDC) System for HVAC.”

4. Operating Unit Gearing:

a. The actuator shall be a double reaction unit with the capability of quickly changingthe output speed with a gear change. The power gearing shall consist of generatedspur or helical gears of heat-treated steel, and worm gearing where required by thetype of operator. Quarter turn or traveling nut operators do not specifically requireworm gearing. The worm shall be of hardened alloy steel and the worm gear shallbe of alloy bronze. All power gearing shall be grease-lubricated. Ball or rollerbearings shall be used throughout for 460 volt motor operators. A mechanical dialposition indicator to display valve position in percent of valve opening shall beprovided. The gearing shall comply with AWWA requirements.

5. Stem Nut:



a. The actuator for other than quarter turn valves shall have a stem nut of high tensilebronze or other material compatible with the valve stem and suited to theapplication. The nut arrangement, where possible, shall be of the 2-piece type tosimplify field replacement. The stem nut for rising stem valves must be capable ofbeing removed from the top of the actuator without removing the actuator from thevalve, disconnecting the electrical wiring, or disassembling any of the gearingwithin the actuator.

6. Manual Operation:

a. A handwheel shall be provided for manual operation. The handwheel shall notrotate during hand operation nor shall a fused motor prevent manual operation.

b. When in manual operating position, the 460 volt motor driven unit will remain inthis position until motor is energized at which time the valve operator willautomatically return to electric operation and shall remain in motor position untilhandwheel operation is desired. This movement from motor operation tohandwheel operation shall be accomplished by a positive declutching knob or leverwhich will disengage the 460 volt motor and motor gearing mechanically but notelectrically. Hand operation must be reasonably fast and require no more than 100pounds of rim effort at the maximum required torque. It shall not be possible forthe unit to be simultaneously in manual and motor operation.

c. For 120 volt motor operated unit, the handwheel shall be detachable to be storedon a hook mounted on the valve if a declutching mechanism is not provided asspecified for the 460 volt motor driven unit.

7. Lost Motion Device (for open, close service on torque seated valves only)

a. The valve control shall have a built-in lost motion device that travels sufficiently toallow the motor to reach full speed before imparting a hammerblow to start valvein motion in either the closing or opening direction. This lost motion device alsomust permit the motor to attain full speed before load is encountered, and loadshould be shared equally by two lugs cast integrally on the drive sleeve.

b. The lost motion device is not to be provided for those valves used in throttling,regulating, position seated or modulating service.

8. 460 Volt Motors:

a. All motors on valves with nominal pipe sizes 3 inches and larger shall be designedfor 460 volts 3 phase 60 Hz power. The motor shall be specifically designed forvalve actuator service and shall be of high torque, squirrel cage reversible, totallyenclosed, non-ventilated construction, with motor leads brought into the limitswitch compartment without having external piping or conduit box. Motorinsulation shall be NEMA Class F with a maximum continuous temperature ratingof 155 degrees C. Motors shall be sized to have a rated running time at the ratedrunning torque of 15 minutes without exceeding the temperature rating of theinsulation system. Running load torque shall be not more than 20% of the ratedseating/unseating torque.

b. Speed-torque curves for the motors and torque calculations for searing, unseating,and running conditions shall be submitted. The maximum valve torque(seating/unseating) shall be less than 50% of stall torque potential of the motor.



9. 120 Volt Motors:

a. Shall be provided for valves with nominal pipe sizes of 1 inch up to 3 inches forcast iron body valves. Motor operators for all PVC valves shall be 120V.

b. Shall be reversible permanent split capacitor type designed to operate on a 120 voltsingle phase 60 Hz power supply and for valve actuator service.

c. Insulation shall be class "B" with a temperature rating of 120 degrees C.d. A thermal overload shall be provided in the motor windings.e. Shall have a TENV NEMA 4 enclosure.f. All wiring for the motor and switches shall be internal leading to the single outlet

box with terminal block.g. Running load torque shall be not more than 20% of the rated torque

seating/unseating.h. The maximum valve torque (seating/unseating) shall be less than 50 percent of the

stalled torque or starting torque potential of the motor.i. Motors shall be sized to have a rated running time at the rated running torque of 5

minutes without exceeding the temperature rating of the insulation system.

10. Speed of Operation:

a. The actuator shall be capable of rotating the valve 90 degrees in 30 seconds.

2.14 SOLENOID VALVES

A. Shall be packless forged brass or cast bronze globe type valve with threaded end connectionsfor nominal pipe sizes up to 1 inch.

B. Shall be of the type that is normally closed on failure and can be opened manually on failure.

C. The plunger assembly (plunger and tube) shall be type 316 stainless steel.

D. The disc shall be Viton or Teflon.

E. Shall be rated for 300 psi.

F. Shall have a molded epoxy resin class B temperature range coil rated for continuous duty and aNEMA 4 water tight coil housing.

G. Shall be suitable for operation on a 120 volt 60 hertz power supply.

H. Shall be as manufactured by ASCO or approved equal.

2.15 AUTOMATIC SAFETY SHUT-OFF VALVE

A. Automatic shut-off valve shall be Maxon Series 7000, or approved equal with electrical proof ofopen and close visual position indicator. Valves for natural gas shall be constructed of cast ironbody with stainless steel seats and ductile iron disc.



2.16 GAS COCKS

A. Gas cocks shall be for use only as manual gas shut-off valves at each piece of gas burningequipment; shall be of the plug type, bronze construction with check, nut and washer bottomand tee handle.

B. Gas cocks shall be manufactured by A.Y. McDonald Mfg. Co., Conbraco Industries Inc., orapproved equal.

C. Gas cocks shall only be used on piping 1 inch and smaller.

2.17 PRESSURE SUSTAINING VALVES

A. Construction: Pressure Sustaining Valve shall consist of a main valve assembly and a pilotsystem, completely assembled and tested as a unit and ready for field installation.

B. Main Valve

1. Main valve body shall be angle style, constructed of high-strength cast iron conformingto ASTM A126 Class B with integral flanges, faced and drilled per ANSI B16.1 Class125. The valve shall be “full-ported” with a flow area through the valve no less than thearea of its nominal pipe size.

2. The main valve shall operate on the differential piston principle such that the area on theunderside of the piston is no less than the pipe area and the area on the upper surface isgreater than that of the underside. There shall be no diaphragms of springs in the mainvalve.

3. The valve piston shall be fully guided units outside diameter and all guiding and sealingsurfaces shall be bronze. To minimize the consequences of throttling, throttling shall beby long, stationary vee-ports located downstream of the seat and not by the seat itself.Sawtooth attachments of other add-on devices are not permitted.

4. The valve shall be fully capable of operating in any position without the need of springsand shall not incorporate stems, stem guides or spokes in the waterway. A visual positionindicator shall be provided.

5. The main valve shall be serviceable in the line through a single flanged cover whichprovides easy access to all internal components.

C. Pilot System

1. Provide a system of pilots and controls to enable the valve to perform the function listedbelow. All controls and control piping shall be non-corrosive and suitable for the workingpressure.

2. System shall include a normally closed, direct-acting, diaphragm operated, spring loadedbronze pressure relief pilot. Pilot shall be easily field adjustable from near zero to aminimum of 10% above the factory setting. Controls shall include adjustable closingspeed control, y-strainer and pilot isolating valves.

D. Function

1. The valve shall open when system pressure exceeds its pressure setting and throttle asnecessary to recirculate excess flow to the pump suction of by-pass to the clearwell in



order to maintain a pre-set maximum pressure on the upstream (system) side of the valve when demand falls below pumping rate. When demand increases and upstream pressure falls below the pre-set maximum, the valve shall close tight.

E. The valve shall be GA Industries, Inc. Figure 6700 DR, or approved equal.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine valve interior for cleanliness, freedom from foreign matter, and corrosion. Removespecial packing materials, such as blocks, used to prevent disc movement during shipping andhandling.

B. Operate valves in positions from fully open to fully closed. Examine guides and seats madeaccessible by such operations.

C. Examine threads on valve and mating pipe for form and cleanliness.

D. Examine mating flange faces for conditions that might cause leakage. Check bolting for propersize, length, and material. Verify that gasket is of proper size, that its material composition issuitable for service, and that it is free from defects and damage.

E. Do not attempt to repair defective valves; replace with new valves.

3.2 VALVE INSTALLATION

A. Install valves with unions or flanges at each piece of equipment arranged to allow service,maintenance, and equipment removal without system shutdown.

B. Locate valves for easy access and provide separate support where necessary.

C. Install valves in horizontal piping with stem at or above center of pipe.

D. Install valves in position to allow full stem movement.

E. Install valve tags. Comply with requirements in Section 230553 "Identification for HVACPiping and Equipment" for valve tags and schedules.

F. Valve Supports:

1. Valves shall be supported as integral components of the piping systems as specified inSpecification 230529 “Hangers and Supports for HVAC Piping and Equipment.”

2. All horizontally or vertically mounted valve operators, manual, pneumatic or electric,shall be designed to sustain the working torque without an external support.

3. Valve supports shall anchor the valves against an unbalanced force in either direction.The magnitude of the force shall be based on a pressure equal to twice the maximumworking pressure with a maximum allowable stress of 1/2 of the support's yield strength.



3.3 ADJUSTING

A. Adjust or replace valve packing after piping systems have been tested and put into service butbefore final adjusting and balancing. Replace valves if persistent leaking occurs.

END OF SECTION 230523

Documents

Specification Section 061053 remove paragraph 2.1.A