Waterous 80-P Operation And Maintenance Instructions page 17

Pump (Continued)
Problem
Relief Valve Malfunction
A. Pressure not relieved
when discharge
valves are closed
Relief Valve Malfunction
B. Pressure will not
return to original
seeing after
discharge valve are
reopened
Relief Valve Malfunction
C. Fluctuating pressure
Relief Valve Malfunction
D. Slow response
F-1031, Section 2449
Troubleshooting Guide
Possible Cause
Sticky pilot valve
Plugged tube lines.
Sticky pilot valve
Sticky main valve
Incorrect installation
Sticky pilot valve
Water surges
(relief valve)
Plugged filter or line
Recommended Action
Disassemble and clean. Replace noticeably worn parts.
Disconnect lines and inspect.
Disassemble and clean. Replace noticeably worn parts.
Disassemble and clean. Replace noticeably worn parts.
Check all lines to be sure installation instructions have been
followed.
Disassemble and clean. Replace noticeably worn parts.
Pressure fluctuation can result from a combination of intake
and discharge conditions involving the pump, relief valve and
engine.
When the elasticity of the intake and discharge system and
the response rate (reaction time) of the engine, pilot valve and
relief valve are such that the system never stabilizes,
fluctuation results.
With the proper combination of circumstances, fluctuation can
occur regardless of the make or type of equipment involved.
Changing one or more of these factors these factors enough
to disrupt this timing should eliminate fluctuation.
Clean lines and filter.
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