10
For additional cross-connection control information, send for F-50 brochure.
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 flow a. Worn, damaged or Disassemble and repair or
conditions defective guide replace guide
3. Low flows passing a. Mainline check fouled Disassemble and clean
through mainline
valve 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
Series 009 and LF009
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