Watts S8 - Manual (Page 44)

2
Reduced Pressure Zone Assemblies
42
Should valve
PROBLEM CAUSE be replaced? SOLUTION
A. Valve spits periodically from the vent.
A.1 Fluctuating supply pressure. No A.1 Install a spring-loaded, soft seated check valve
immediately upstream of the device.
A.2 Fluctuating downstream pressure. No A.2 Install a spring-loaded, soft seated check valve
downstream of the device as close as possible
to the shutoff valve.
B. Valve drips continually from the vent.
B.1 Fouled first check. No B.1 Flush valve. If flushing does not resolve problem,
disassemble valve and clean or replace the first check.
B.2 Damaged or fouled relief valve seat. No B.2 Clean or replace the relief valve seat.
B.3 Relief valve piston O-ring not free to No B.3 Clean, grease or replace the piston O-ring.
move due to pipe scale, dirt or build-up
of mineral deposits.
B.4 Excessive backpressure, freezing, or water No B.4 Eliminate source of excessive backpressure or
hammer has distorted the second check water ham-
mer in the system downstream of the device. Use Watts
Series LF601/601 to dampen out backpressure and Series
LF15/15 to eliminate water hammer. Replace defective
second check assembly. In case of freezing; thaw, disas-
semble, and inspect internal components. Replace as
necessary.
B.5 Electrolysis of relief valve seat or first . No B.5 Replace relief valve seat or inlet cover. Install
check seats dielectric unions (Watts Series LF3001/3001
through LF3006/3006). Electrically ground the piping sys-
tem and/or electrically isolate the device with plastic pipe
immediately upstream and downstream of the device.
B.6 Valve improperly reassembled. No B.6 If valve is diassembled during installation, caution must be
exercised to install check springs in their proper location.
C. Valve exhibits high pressure drop.
C.1 Fouled strainer. No C.1 Clean strainer element or replace.
C.2 Valve too small for flows encountered. Yes C.2 Install proper sized device based upon flow
requirements.
D. No water flows downstream of valve.
D. Valve installed backwards. No D. Install valve in accordance with flow direction arrow.
E. Valve does not test properly.
E.1 Follow manufacturer's test procedure. No E.1, E.2 Clean or replace gate valve with full port ball
E.2 Leaky downstream gate valve. No valves or resilient wedge shutoff valves.
F. Valve quickly and repeatedly fouls following servicing.
F. Debris in pipe line is too fine to be trapped by strainer. No F. Install finer mesh strainer element in the strainer.
G. Winterization of backflow preventers. G. Prevent freeze damage by enclosing in a WATTSBOX
heated enclosure. For additional information, send for
literature ES-WB.
Troubleshooting Guide
Reduced Pressure Zone Assemblies, Reduced Pressure Detector Assemblies