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Metering Pump Spare Parts Replacement
Metering Pump Spare Parts Replacement
Pump Components (Metering Pump)
• Pumps are supplied with a 120VAC or 240VAC power cord. Use care to ensure pump is plugged into a properly grounded receptacle.
• Be sure the pump is properly anchored before connecting tubing and other pump components
• Pumps are traditionally installed one of two ways, Suction lift and flooded suction.
Pump Components (4-FV)
The Four function valve
(4-FV) mounts on the
discharge side of pump head
4 functions of valve
• Back pressure (yellow)
• Anti-siphon (yellow)
• Pressure relief (black)
• Line drain (black)
Pump Components (Foot Valve and Weight)
• The foot valve is positioned at the bottom of the supply tank
• In suction lift applications the Foot valve is used to prevent loss of prime
• A filter screen prevents debris from entering the pump
Note: Position foot valve vertically
Ceramicweight
Foot valve
Filterscreen
Pump Components (Injection Check
Valve)• The Injection check valve
is positioned at the end of the discharge tubing line
• A 1/2” NPT thread allows the ICV to be piped directly into a pressurized line
• The flapper valve prevents deposits from clogging the injector
Note: Install on underside of pipe
Flappervalve
1/2 NPTpipe thread
Pump Components (Discharge and Suction Tubing)
• Most pumps come equipped with flexible PE tubing for the discharge and suction connections
• In some liquid ends vinyl tubing is offered. This low pressure tubing should be used on the suction line only.
• In applications requiring pipe connections, fittings are supplied with NPT pipe threads. No tubing is supplied with these pumps.
• Optional black UV tubing is available for UV applications
Spare Part Replacement Kit
• Spare part kits, replacement tubing and other pump components can be obtained from your local pump supplier
• Spare parts should be replaced annually
• It is also recommended that discharge and suction tubing be replaced annually
Protective Clothing and Eye Protection
• CAUTION: Wear protective clothing and eye protection when working on or near all chemical metering pumps.
• A full face shield and long chemically resistant gloves and apron are recommended.
• Check MSDS sheet for other precautions
De-Pressurize Liquid End
• Turn pressure relief knob (black) 1/4 turn
• Discharge line is now de-pressurized
• Solution should flow back down discharge line and out return line back to supply tank
Remove Discharge Tubing
• Remove discharge tubing
• Turn coupling nut counter-clockwise to remove.
• Remove tubing from fitting by pulling up.
Remove Return Line Tubing
• Remove return line• Turn coupling nut
counter-clockwise to remove.
• Pull tubing out of valve
Remove 4-FV From Head
• Remove 4-FV• Turn 4-FV counter-
clockwise to remove
Remove Discharge Cartridge Valve (Check Valve)
• Remove discharge cartridge valve or check valve ball and seal ring from pump head
Remove Cartridge Valve (Check Valve)
• Remove suction fitting by unscrewing counter -clockwise
• Remove cartridge valve or check valve ball and seal ring from pump head
Remove Pump Head
• Remove pump head• Remove the four
screws that mount the pump head
Remove Old Pump Diaphragm
• Remove the pump diaphragm by turning it counter-clockwise
Remove Old Diaphragm and Disk
• Remove the diaphragm and backing disk
• Discard diaphragm and inspect disk for damage
Remove Shaft Seal
• Remove the shaft seal using needle nose pliers. Pull shaft seal out and discard
Replace Shaft Seal
• Install the new shaft seal using a large hollow pen cap or wrench socket large enough to clear diaphragm shaft
• Push seal in place
Replace Pump Diaphragm
• Install the disk and new pump diaphragm by turning it clockwise
• position diaphragm in and out until the center of the diaphragm is flush with outside of the spacer housing
Replace Pump Head
• Re-install the four screws that mount the pump head loosely
• Tighten the screws gradually in a crisscross pattern until all screws are tight
Compression Washer Replacement
• Compression washers are located in fittings and function valves
• If necessary, remove washer with small screw driver
• Install new washer by hand by pushing into fitting
Correct Installation of Cartridge Valves
BOTTOM
TOP
Directionof Flow
CORRECTPOSITION
INCORRECTSmoothside
Ballseatside
Cartridge Valves vs. Ball and Seal Rings
Directionof Flow
BALL& SEAL
RING
EXAMPLE: FOOTVALVEFOR LARGER
PUMPS
EXAMPLE: FOOT VALVEFOR SMALLER
PUMPS
CARTRIDGEVALVE SHOWN
DIS ASSEMBLED
Replace Suction and Discharge Cartridge Valves (Check Valve)
• Install new cartridge valves or check valve balls and seal rings in pump head
• Place o-ring on cartridge valve
• Position ball seat side of cartridge valve toward floor
• Hand tighten fittings do not use pliers of pipe wrench
Injection Check ValveSpare Parts
• Install new Injection check valve components
• Screw fitting down hand tight. Do not use pliers or pipe wrench
SPRING
BALL
PTFE SEAT
O-RING
• Install new cartridge valve and o-ring
• Place o-ring on cartridge valve
• Position ball seat side of cartridge valve toward floor
• Screw fitting down hand tight. Do not use pliers or pipe wrench
Foot Valve Spare Parts
CARTRIDGEVALVE
O-RING
Install New Pump Tubing
• Replace all discharge and suction tubing annually
• Contact your local pump supplier for replacement tubing
• Do not re-start pump until all tubing connections have been made