Watts Series 709 - Troubleshooting Guide; Check Valve Failure to Hold Pressure; Chatter During Flow Conditions; Low Flows Through Mainline Valve

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Symptom Cause Solution
1. Check valve fails to hold a. Debris on check disc Disassemble and clean
1.0 PSID minimum sealing surface
b. Leaking gate valve Disassemble and clean or repair
c. Damaged seat disc or Disassemble and replace
seat o-ring
d. Damaged guide holding Disassemble clean or replace
check open
e. Weak or broken spring Disassemble and replace spring
2. Chatter during fl ow a. Worn, damaged or Disassemble and repair or
conditions defective guide replace guide
3. Low fl ows passing a. Mainline check fouled Disassemble and clean
through mainline
valve (709DCDA only)
b. Meter strainer plugged Disassemble and clean
c. Damaged mainline seat Disassemble and replace
disc or seat
d. Broken mainline spring Disassemble and replace
Troubleshooting Guide
RP-IS-709_709DCDA.indd 7 9/26/08 2:28:15 PM