Instruction Manual

Test No. 1
765 Shown
Test Procedure for Pressure
Type Vacuum Breaker
Note: For both of the following tests the test kit must be held at the same
level as assembly being tested.
A.Beforestartingtestallneedlevalvesandbleedvalvesmustbeclosed.
B.Flushtestcock#2and#1.
Test No. 1 – Air Inlet
Requirement:Airinletmuststarttoopenwhendownstreampressureis
1.0psiorabove.
Step1 Removenutontopofhoodandremovehood.
Step2 InstallhosebetweentestcockNo.2andconnection"A"onhigh
side(red)ontestkit.
Step3 OpentestcockNo.2andneedlevalve"A"highside(red)ontest
kit.
Step4 Openbleedvalve"A"ontopoftestkit.Bleedairfromhose.
 Thenclosebleedvalve"A"ontopoftestkit.
Step5 CloseshutoffvalveNo.2thenshutoffvalveNo.1.
Step6 Slowlyopenneedlevalve"C"bypass(yellow)justasairinlet
 opens.Recorddifferentialpressure.
Step7 ClosetestcockNo.2andremovehose.
Step8 Closeneedlevalve"C"bypass(yellow).
Step9 OpenshutoffvalveNo.1.
Test No. 2 – Test Check Valve Pressure Drop
Requirement:Supplypressuredropmustbe1.0PSIDorabovewhen
waterflowstopsfromtestcockNo.2.
Step10 InstallhosebetweentestcockNo.1andconnection"A"high
 side(red)ontestkit.
Step11 OpentestcockNo.1andbleedvalve"A"ontopoftestkit.
 Openbleedvalve"A"ontopoftestkitandbleedairfromhose.
 Shutoffbleedvalve"A"ontopoftestkit.
Step12 Closeshutoffvalve#1.
Step13 OpentestcockNo.2.WhenflowofwateroutoftestcockNo.
 2stops,thedifferentialreadingisthepressuredroprecord
Step14 ClosetestcockNo.1andtestcockNo.2.
Step15 Replacehoodandnutontopofhood.OpenshutoffvalvesNos.
1then2.
2
Test No. 2
765 Shown
Bleed Valve A Bleed Valve B
Test Cock No. 2
Test Cock
Bleed Valve A Bleed Valve B
Test Cock No. 2
Test Cock