Troubleshooting
WILKINS, a ZURN company
1747 Commerce Way, Paso Robles, CA 93446 Phone:805-238-7100 Fax:805-238-5766
a company
®
®
Proposition 65 Warning This product contains chemicals known to the State of California to cause cancer or birth defects
or other reproductive harm.
WARRANTY:
WILKINS Valves are guaranteed against defects of material or workmanship when used for the services recommended. If in any
recommended service, a defect develops due to material or workmanship, and the device is returned, freight prepaid, to WILKINS within 12 months
from date of purchase, it will be repaired or replaced free of charge. WILKINS’ liability shall be limited to our agreement to repair or replace the
valve only.
NOTICE: Annual inspection and maintenance is required of all plumbing system components. To ensure proper perfor-
mance and maximum life, this product must be subject to regular inspection, testing and cleaning.
PROBLEM
POSSIBLE CAUSES
CORRECTIVE ACTION
1. Outlet pressure is above
set pressure
1. The spring is over compressed
1. Loosen the adjusting screw
2. Foreign matter obstruction
2. Disassemble and remove obstruction, replace parts as
necessary
3. Cut, worn or chipped plunger seal or seat. 3. Replace with new plunger or seat.
4. Damaged diaphragm or stem o-ring
4. Disassemble and replace diaphragm or o-ring
5. Yoke dragging on body
5. Disassemble valve. Check yoke placement per
Reassembly Step 2 and reassemble
2. Outlet pressure is below
set pressure
1. Weak or no spring compression
1. Turn adjusting screw in to increase pressure regulation
2. Spring damaged
2. Disassemble and replace spring as needed
3. Spring disc out of place
3. Disassemble and replace or adjust spring disc as
needed
4. Yoke dragging on body
4. Disassemble valve. Check yoke placement per
Reassembly Step 2 and reassemble
5. Foreign matter between plunger and
main cap
5. Disassemble and remove obstruction
3. Leakage from valve
1. Damaged diaphragm, yoke or main cap
o-ring
1. Disassemble and replace damaged part as needed
2. Ports not sealed
2. Remove and reinstall port fittings Teflon tape or pipe
sealant
3. Loose diaphragm nut
3. Disassemble and re-tighten the diaphragm nut
ISPV-PRD (REV. 6/12)
2
Installation Instructions
Before installing the pressure reducing valve, flush out
the line to remove loose dirt and scale which might damage
the plunger and seat. Install the valve in line with the arrow
on the valve body pointing in the direction of flow. All
valves will be furnished with stock settings. To readjust
reduced pressure, loosen the outer locknut and turn the
adjustment bolt clockwise (into the bell housing) to raise
the reduced pressure, or counterclockwise (out of the
bell housing) to lower the reduced pressure. The valve
may be installed in a horizontal or vertical position.
PV-PRD SPECS:
Adjustment Range Pressure:
20-200 psi
(Flowing residual outlet pressure)
Max Inlet Pressure:
400 psi
NOTE : All adjustments should be made with a pres-
sure gauge and while flowing water through the main
valve.
