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Under normal operating conditions this ongoing process
removes accumulation of gas long before they are visible
or detrimental to pump operation. To accelerate
hydraulic startup, pressing the spring-loaded button at
the top of the valve holds the valve momentarily open so
that large amounts of gas can be instantly purged.
When the button is released, the valve reverts to normal
automatic operation. PTP operation can be monitored
by observing oil flow from the diagnostic port through the
sight glass. Any accumulation of solids can cause the
valve to malfunction.
Figure 42
Removal, Cleaning, and Reinstallation of PTP
o
Disconnect the pump from the power source.
o
Relieve all pressure from the piping system.
o
Slowly unscrew the valve to gradually relieve any residual hydraulic system pressure.
o
Remove the valve and clean it by soaking in compatible solvent. Valve operation can be
confirmed by blowing air through it in both directions and listening for the “click” sound of ball
seat contact in both directions.
o
Make sure that the copper gasket is installed at the bottom of the threaded hole in the pump
head. It does not need replacement if it is undamaged.
o
The elastomer gasket around the upper portion of the valve assembly may be likewise re-
used.
THE VALVE IS NOT REPAIRABLE, AND MUST BE REPLACED IF IT CONTINUES TO
MALFUNCTION AFTER CLEANING.
8.10
Piston Seals
PulsaPro piston seals are a thermoplastic elastomer with an FKKM energizer seal. The seal is
mounted two different ways: on the piston (for larger piston sizes) or in the cylinder (for smaller
piston sizes). With oil changes at recommended intervals, piston assemblies should provide
years of service.
Figure 43
