INSTALLATION, OPERATION, &
MAINTENANCE MANUAL
TITLE:
F70VP Series
Rev. B
Vacuum Relief Valve
Page 17 of 20
6)
To check backflow preventer operation:
a) Connect the main valve process connection to test air source. Pilot inlet should be open to
atmosphere.
b) Raise test pressure to 5 – 10 psig. Backflow preventer check valves should route pressure to
the pilot bonnet and pilot inlet simultaneously, keeping the pilot closed and routing air into the
main valve dome to seat the piston. Check outlet for indications of leakage.
c) Slowly vent off pressure from test source. Disassemble and check/clean main valve and
backflow preventer check valve sealing surfaces if any leaks were detected. Reassemble
component(s) and repeat test.
7)
Once testing is complete, the valve assembly is ready for installation. If applicable, flange
protectors should be installed and other protective measures taken during transport.
F70VP Assembly – Fixed Set Point
