Appendix F—Troubleshooting Guide for the ZV200 Bypass Valve
F . Troubleshooting Guide
G . Extended Storage
Appendix G—Extended Storage of the ZV200 Bypass Valve
If your bypass valve is to be removed from service for some time, it must be protected as propane, butane and
anhydrous ammonia all leave the metal “bare” and open to corrosion. Piping and tanks not in service should also be
protected as the rust particles can destroy the pump’s seals almost immediately after startup.
1. Fill or thoroughly flush the bypass valve with a light rust inhibiting oil. (If the bypass valve is flushed with oil, placing
some desiccant packets inside the bypass valve will provide added protection.)
2. Plug all bypass valve openings.
3. Store in a dry location.
4. Before placing the bypass valve back into service, drain the oil and remove any desiccant packets.
5. Refer to pages 5–7.
Problem
Cause
Solution
Low capacity
Valve set too low.
Note: After all potential causes from
the pump and system have been
investigated
Adjust valve as demonstrated in this IOM manual on
pages 5–7.
Adjusting screw
will not turn
Screw adjusted full in
Adjustment too high—back out adjustment and
adjust valve per instructions in this IOM manual on
pages 5–7.
Noise from valve
during system
operation
Spring broken
Depressurize system. Open valve and inspect.
Replace spring if necessary.
Adjustment screw set too far out
Adjust valve per instructions in this IOM manual on
pages 5–7.
Excessive restriction in return line
Remove restrictions.
Valve leaking
product
O-ring failure
Depressurize system. Open valve and inspect.
Replace O-ring.
Fitting loose
Identify and tighten fitting.
Valve will not
adjust to
desired pressure
Spring guide or O-ring failure
Depressurize system. Open valve and inspect
O-ring and spring guide.
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