4.5 Pump Head Removal
The PULSA GLM includes a Pump Head that clamps the diaphragm to the Reagent Head. In the
event of diaphragm failure process fluid can come into contact with this part (it includes a drain hole
to prevent fluid accumulation). Over time, it is possible for this part to suffer some level of
deterioration and need replacement.
1.
Disconnect and Lockout the power supply to the drive motor.
2.
Relieve all pressure from the piping system.
3.
Take all precautions necessary to prevent contamination to the environment and personnel
exposure to hazardous materials.
4.
Close the inlet and outlet shutoff valves.
5.
Remove the valving, Reagent Head and Diaphragm as described in section 4.2.1.
6.
Drain the oil from the pump.
7.
Set the pump stroke setting to 100%.
8.
Rotate the pump motor until the Cross Head (the part that the Diaphragm threads onto) is fully
retracted into the Gear Box.
9.
Evenly loosen all (4) bolts that retain the Pump Head to the Gear Box.
Figure 17: Pump Head Retaining Bolt Removal
10. Remove old pump head from front of Gear Box.
a.
b.
Figure 18, Pump Head Cross Section and Bellows Seal
11. Orient replacement Pump Head with drain hole pointed down. Assure o-ring is in place on
Gearbox side.
12. Ensure the bellows oil seal is seated on the end of the cross head as shown above.
13. Insert Spring Guide of Pump Head over Cross Head and into spring. Take care to assure spring
does not catch on tapered guide during installation.
14. Install the four retaining bolts. Tighten evenly. Torque to 80 in-lbf.
15. Install Diaphragm, Reagent Head and Valving as defined in Section 4.2.1.
Warning – Stored energy
release possible - use caution!
The pump head compresses a
large spring that is used to
return the diaphragm to its
retracted position. Special tools
may be required to reattach the
pump head.
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