Product Manual

Fault Finding
System Will Not Pressurize 7
7-3
System Will Not Pressurize
1. Ensure correct valve operation during priming process.
2. Check DUT is not leaking.
3. Clean system externally, check for fluid leak by continually trying to pressurize.
Wherever fluid appears, replace the seal—check sealing faces are clean and
undamaged before re-assembly.
Priming Pump Malfunction
1. If pumping does not generate pressure, then the inlet check valve has probably failed,
and requires replacement.
2. If the system pressurizes and depressurizes in conjunction with the downward and
upward strokes of the pump, then the outlet check valve has failed completely. This
should be disassembled and inspected for dirt or damage to valve seat and seal. After
inspection, clean all parts carefully, replace as required, and re-assemble correctly.
3. If the pump handle rises during normal system pressurization, then the outlet check
valve is leaking. Inspect as above.
W
Caution
Do not continue to pressurize if pump handle rises, as this can
damage the inlet check valve.
Cannot Reach Maximum Pressure
If maximum pressure cannot be reached, even after the screw press has been turned fully
in, and the checks above have been made:
1. Ensure that the screw press is FULLY OUT, and the priming pump is used for initial
pressurization.
2. If the DUT has a large internal volume or there is air in the system, then re-prime
increasing the initial pressurization with the priming pump from 100 psi/7 bar to at
least 200 psi/14 bar.