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