Use And Care Manual

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. [phone] • Fax: [phone] • www.FEBCOonline.com
Canada: 5435 North Service Rd. • Burlington, ONT. • L7L 5H7 • Tel. [phone] • Fax: [phone] • www.FEBCOonline.ca
IOM-F-765 0823 © FEBCO, 2008
IOM-F-765.indd 4 8/11/08 2:56:43 PM