Learning the Basics
Flush Test Cocks (TC)
Step #1 - Install test adapters (if applicable)
Step #2 - Open TC #1 - close
Step #3 - Open TC #2 - close
Step #4 - Remove canopy from air-inlet valve
Step #5 - Verify the orientation of each shutoff valve. #1 shutoff must be open and #2 shutoff may be closed at this time.
Attach Test Kit - Air Inlet Valve
Step #1 - Close all the gauge valves
Step #2 - Open gauge high-bleed valve
Step #3 - Open TC #2 with trickle flow and attach the gauge high-pressure hose to TC #2
Step #4 - Once water flows from the bleed/bypass hose, SLOWLY close gauge high-bleed valve Step #5 - Open TC #2 completely
Test #1 - Air inlet valve opening
Step #1 - Verify that #2 shutoff is closed and then close #1 shutoff
Step #2 - Establish gauge centerline with assembly air-inlet valve and maintain through step 4
Step #3 - Slightly open gauge high-bleed valve
Step #4 - Test results: Observe and record the value at the air-inlet valve opening (Note: this value must be 1psid or greater)
Step #5 - Close TC #2 and remove gauge hose
Step #6 - Open #1 shutoff
Step #7 - Reinstall canopy
Attach Test Kit - Check Valve
Step #1 - Close all the valves
Step #2 - Open gauge high-bleed valve
Step #3 - Open TC #1 with trickle flow and attach the high-pressure hose to TC #1
Step #4 - Once water flows from the bleed/ bypass hose, SLOWLY close gauge high-bleed valve Step #5 - Open TC #1 completely
Test #2 - Tightness of Check Valve
Step #1 - Close #1 shutoff valve
Step #2 - Establish gauge centerline with assembly check valve and maintain through
Step #3 - Slowly open TC #2
Step #4 - Test results: Observe and record the value when water stops flowing from the test cock. (Note: this value must be 1psid or greater)
Step #5 - Close TC #1 and TC #2
Step #6 - Restore assembly to pre-test condition.
Step #7 - Remove high test hose
One-Hose Test Procedure for an ASSE 1020
Pressure Vacuum Breaker Assembly (PVB)
Field Testing Requirements
Febco PVB
The Febco 765 is a pressure vacuum breaker ( PVB ). It is available in ½” – 2” sizes and has been in production since 1975. The body is made of bronze.
Wilkins PVB
The Wilkins 720A is a pressure vacuum breaker ( PVB ). It is available in ½” – 2” sizes and has been in production since 1984. The body is made of bronze. In 2010 the test cocks were moved from the body to the inlet and outlet shutoff valves.
Feed back is Appreciated !
ASSE Approved PVB 1 Hose Test Procedure