7
Should
valve
PROBLEM CAUSE
be
replaced?
SOLUTION
A. Valve spits periodically from the vent.
A.1 Fluctuating supply pressure.
No
A.1 Install a soft seated check valve immediately upstream
of the device. (Watts 3/4”- 2” No. 601 bronze valve.)
A.2 Fluctuating downstream pressure.
No
A.2 Install a soft seated check valve downstream of the
device close as possible to the shutoff valve.
(Watts 3/4”- 2” No. 601 bronze valve.)
B. Valve drips continually from the vent.
B.1 Fouled fi rst check.
No
B.1 Flush valve. If fl ushing does not resolve problem,
disassemble valve and clean or replace the fi rst 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 move due to
No
B.3 Clean, grease or replace the piston “O” ring.
pipe scale, dirt or build-up of mineral deposits.
B.4 Excessive backpressure, freezing, or water hammer
No
B.4 Eliminate source of excessive backpressure or water
has distorted the second check.
hammer in the system downstream of the device. Use
Watts No. 601 to dampen out backpressure and No. 15
to eliminate water hammer. Replace defective second
check assembly. In case of freezing; thaw,
disassemble, and inspect internal components.
Replace
as
necessary.
B.5 Electrolysis of relief valve seat or fi rst check seats.
No
B.5 Replace relief valve seat or inlet cover. Install dielectric
unions (Watts Series 3001 through 3006). Electrically
ground the piping system 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 fl ows encountered.
Yes
C.2 Install proper size device based upon fl ow
requirements.
D. No water fl ows downstream of valve.
D. Valve installed backwards.
No
D. Install valve in accordance with fl ow 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 fi ne to be trapped by strainer.
No
F.
Install fi ner mesh strainer element in the strainer.
G. Winterization of backfl ow preventers.
G. Electric heat-tape wrap closely together around valve
body. Build a small shelter around the valve with a
large light bulb installed and left on at all times.
If supply line is not used during the winter, removal
of the complete body is the best. This would create
an air gap to eliminate any possible backfl ow.
Troubleshooting Guide
Reduced Pressure Zone Assemblies
IS-TK-DL.indd 7
9/5/08 2:18:59 PM
