Watts 957-FS Serie Manual De Instalación & Mantenimiento página 6

Service, Replacement Parts, and Maintenance
Sleeve O-ring and Gasket
Check Module
O-ring
First Check Module
Relief Valve
For repair kits and parts, refer to the Backflow
Prevention Products Repair Kits & Service Parts
price list PL-RP-BPD at www.watts.com.
Troubleshooting
SYMPTOM
Relief valve discharges water while system is not flowing
Relief valve does not shut off properly
6
Closure Sleeve Test Cock with O-ring
Disc, Elastomer for tight shutoff
Second Check Module
Check #1 is fouled
Relief valve does not properly close
Municipal water pressure is fluctuating
Fouled relief valve seat
Incorrectly Installed diaphragm
Damaged rubber surface on piston
Damaged or plugged pressure hose
Closure Sleeve
E-clip
Relief Valve Assembly
Body
Diaphragm
Cover Plate
Assembly
CAUSE
Remove and clean check #1
Service relief valve
Install check valve upstream of backflow assembly
Service relief valve
Remove diaphragm and correctly install
Replace with new piston
Replace or clear pressure hose
O-ring, Inlet Coupler
Spider Bushing
Spring
Piston Assembly
Screw, Cover
SOLUTION