Pulsafeeder PULSAtron Series HV EN - Manual (Page 12)

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Depressurize the system and disconnect tubing or piping from the pump. Remove the four pump head screws and then
remove the pump head assembly.
Remove the diaphragm by grasping it at the outer edge and turning it counter clockwise until it unscrews from the
electronic power module (EPM). Don’t lose the deflector plate or diaphragm shims which are behind the diaphragm, they
are needed for re-assembly. Note shim quantity may be from 0 to 2.
Inspect diaphragm, if it is intended to be used again look for indications of the PTFE face being overstretched, (localized
white areas) or the elastomer on the back of the diaphragm being worn. Excessive amounts of either condition require
diaphragm replacement.
6.3 Diaphragm Replacement
When replacing the diaphragm, it is always a good idea to replace
the valve cartridges and other worn parts. A kit is available from your
supplier with all parts necessary to completely rebuild your pump’s
wet end. All your supplier needs to know is the “KOPkit No.” on your
pump’s data label to supply this kit.
Set pump stroke length at 50% and unplug the pump.
If you kept the shims from the original diaphragm or know the original
quantity you can avoid the next step for shimming the diaphragm.
Apply grease to areas of the diaphragm that contact the deflection
plate.
Slide the diaphragm deflection plate onto the back of the diaphragm
stud, radius side towards the diaphragm. Next slide two shims onto
the diaphragm threaded stud and screw the diaphragm into the EPM
unit. Refer to Figure 14. Turn diaphragm clockwise until deflection
plate and shims are tight against solenoid shaft and the diaphragm
stops turning. If there is a gap between the adaptor and diaphragm,
repeat the procedure removing one shim each time until the diaphragm just touches the adaptor or is slightly recessed.
If not already done, adjust stroke length to 50%. Place the pump head onto the adaptor with valve flow arrows pointing up
and install and tighten pump head screws. Tighten screws until pump head pulls up against adaptor.
NOTE: Adjust stroke length only when pump is running!
Adjust stroke length back to 100% for easier priming and place pump back into service.
6.4 Valve Replacement
Flush pump to clean any chemical from pump head.
Unplug pump, release system pressure, and disconnect tubing or piping.
Unscrew valve cartridges and discard. Also remove o-rings down inside the pump head.
Install new valve cartridges with stamped letters reading from top to bottom, and the arrow pointing in the direction of flow.
Hand-tighten only, do not use wrenches or pliers.
Reconnect tubing or piping and reinstall the pump.
Check for leaks around newly installed fittings.