Watts 957 Series - Parts Identification and Troubleshooting; Troubleshooting Common Issues

6
Troubleshooting
O-ring, Inlet Coupler
Relief Valve Assembly
Closure Sleeve Test Cock with O-ring
Sleeve O-ring and Gasket
Parts
For repair kits and parts, refer to the Backflow
Prevention Products Repair Kits & Service Parts
PL-RP-BPD price list at watts.com.
Second Check Module
SYMPTOM CAUSE SOLUTION
Relief valve discharges water while system is not flowing Check No. 1 is fouled Remove and clean check No. 1
Relief valve does not properly close Service relief valve
Municipal water pressure is fluctuating Install check valve upstream of backflow assembly
Relief valve does not shut off properly Fouled relief valve seat Service relief valve
Incorrectly Installed diaphragm Remove diaphragm and correctly install
Damaged rubber surface on piston Replace with new piston
Damaged or plugged pressure hose Replace or clear pressure hose
Check Module
O-ring
First Check Module
Relief Valve
Disc, Elastomer for tight shutoff
Closure Sleeve
E-clip
Spider Bushing
Spring
Piston Assembly
Screw, Cover
Body
Diaphragm
Cover Plate
Assembly