Part Number: 2A33687
Release Date: 8/27/2015
Revision: B
49
Troubleshooting Guide
Always follow existing Weir Oil & Gas procedures concerning identifying equipment for inspection, and removing
equipment from service. The following is intended as a general guide in helping resolve most problems
encountered in repairing emergency relief valves. If problems not covered here are encountered, contact Weir Oil
& Gas for assistance.
SYMPTOM PROBLEM SOLUTION
1. Rapid erosion a) Used as continuous bypass a) Use only as an emergency back
pressure relief device
b) Used beyond rated capacity b) Install sufficient quantity of valves to
meet capacity requirements
2. Shuddering (Rapid
opening and closing)
a) System pressure hovering at
set pressure
a) Raise set pressure slightly
b) Back pressure relief valve
located too close to pump’s
discharge
b) Relocate EXL Back Pressure Relief
Valve. Refer to service literature for
information on proper location.
c) Valve installed before pressure
dampener
c) Relocate relief valve behind pressure
dampener
3. Loss of pressure (Valve
does not seal or loses fluid
through discharge)
a) Valve not set properly a) Set valve correctly.
b) Damaged nozzle or valve gate b) Replace damaged parts
c) Damaged high pressure
cylinder connection
c) Replace damaged parts
d) Contaminants trapped between
valve gate and nozzle
d) Clean affected parts
4. Valve leaks through
weephole or between
valve body and cap
a) Damaged inner or outer or both
flange seals
a) Replace damaged seals
5. Valve releases higher or
lower than intended relief
pressure
a) Valve set incorrectly a) Reset valve to desired pressure per
instructions in Section II
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