Pressure Control Valves - Xylem Goulds CentriPro Series Service Manual

Pump Runs But . . .
Pumps water, but does not develop 40 lbs.
tank pressure. . .
Problem
1. Leaks in well piping or
discharge pipe.
2. Jet or screen on foot valve
partially plugged.
3. Improper pressure control valve
setting (deep well only).
4. Suction lift too high for shallow
well system.
a. Jet set too deep for
deep well system.
5. Faulty air charger.
6. Worn impeller hub and/or
guide vane bore.
7. Overpumping the well.
72
Recommended Action
Pressurize piping system
and inspect.
Clean if necessary.
See Pump IOM
Use vacuum gauge on
shallow well systems
Vacuum should not exceed
22 inches at sea level.
On deep well system
check ratings tables
in catalog for maximum
jet depth.
Disconnect the tubing and
plug the hole. If this
corrects the trouble, the air
control must be replaced.
Replace if necessary.
Clearance should not
exceed .012 on a side or
.025 diametrically.
Throttle a valve on the
pump suction – do not
exceed 22" Hg.