PRESSURE VACUUM BREAKER
Symptom: Cause:
Solution:
1. Check value fails to hold 1.0
A. Debris on sealing surface or guide surfaces
Disassemble and clean check
psid minimum
valve surfaces
B. Damaged seat disc
Disassemble and replace seal
C. Weak or broken spring
Disassemble and replace spring
D. Poppet broken due to thermal expansion
Replace broken poppet (see freeze protection)
2. Poppet fails to open at 1.0
A. Debris restricting free operation
Disassemble and clean check valve surfaces
psig minimum
B. Poppet seal adhering to bonnet
Disassemble and clean and/or replace damaged parts
C. Weak spring load
Replace bonnet assembly (
1
/
2
- 1
1
/
4
)
Replace
spring
(1
1
/
2
and larger)
3. Minor leakage through air vent
A. Damaged poppet seal
Disassemble and replace seal
B. Cracked or damaged poppet
Disassemble and replace poppet seal
C. Cracked bonnet or damaged sealing edge
Disassemble and replace bonnet assembly
D. Debris on sealing surface
Disassemble and clean
4. Signifi cant discharge through
A. Poppet not properly guided
Disassemble and replace damaged parts
air vent
B. Major poppet or seal failure
Disassemble and replace damaged parts
C. Low downstream pressure
Check pressure at
#
2 testcock; should
be higher than 5 psig if low system
D.
Insuffi cient inlet volume to operate device
Pressure needs to be increased or partially
closed outlet ball valve to create higher
pressure
on
poppet.
E. Poppet and or bonnet broken
Replace broken bonnet/poppet
due to thermal expansion (see freeze protection)
5. Chatter during fl ow conditions
A. Worn, damaged or defective check valve guide
Disassemble and repair or replace guide
Troubleshooting Guide
A Division of Watts Water Technologies, Inc.
USA: 4381 N. Brawley • Ste. 102 • Fresno, CA • 93722 • Tel. (559) 441-5300 • Fax: (559) 441-5301 • www.FEBCOonline.com
Canada: 5435 North Service Rd. • Burlington, ONT. • L7L 5H7 • Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.FEBCOonline.ca
IOM-F-765 0823
© FEBCO, 2008
IOM-F-765.indd 4
8/11/08 2:56:43 PM
