Instruction Manual

Test Procedure for Reduced
Pressure Assembly
A. Allneedlevalvesmustbeclosedontestkit.
B. OpentestcockNo.4andflushtestcocksNos.1,2and3onreduced
pressureassemblythenclosetestcockNo.4.
C. Attachhosesasshown.Bleedairfromkit,closeNo.2shutoff.
Test No. 1 - Check Valve No. 2
Purpose:TotestcheckvalveNo.2fortightnessagainstreverseflow.
Requirements: Valve must be tight against reverse flow under all pressure
differentials.
Step1 Slowlyopentheneedlevalve"A"highside(red)and"C"bypass
(yellow).Keepthe"B"low(blue)closed.
Step2 OpentestcockNo.4.OpentestcockNo.2andtestcockNo.3
afteropeningtestcockNo.4.
Step3 Indicatedpressuredifferentialwilldecreaseslightly.Ifpressure
differentialcontinuestodecrease(untiltheventopens)theNo.
2checkvalveisreportedas"leaking".
Test No. 2 - Shutoff Valve No. 2
Purpose:TotestshutoffvalveNo.2fortightness.
Step1 AfterpassingTestNo.1,continuetotestNo.2byclosingtest
cockNo.2.
Step2 Theindicatedpressuredifferentialwilldecreaseslightly.Ifpres-
suredifferentialcontinuestodecrease(approaching"zero")the
No.2shutoffvalveisreportedtobe"leaking".
Note:AleakingNo.2shutoffwillgiveafalsereadingintestsNo.3and4.
Test No. 3 - To test No. 1 Check Valve
Purpose:TotestcheckvalveNo.1fortightness.
Requirements: Valve must be tight against reverse flow under all pressure
differentials.
Step1 Closeneedlevalve"A"highside(red)andopentestcockNo.2.
Step2 ClosetestcockNo.4.Disconnectbypasshose(yellow)attest
cockNo.4.
Step3 Openneedlevalve"B"low(blue)and"C"bypass(yellow),bleed-
ingtoatmosphere,thenclosingneedlevalve"B"(blue)restores
the system to a normal static condition.
Step4 Observethepressuredifferentialgauge.Ifthereisadecreasein
theindicatedvalue,theNo.1checkvalveisreportedas"leaking"
Test No. 4 - Pressure Differential Relief Valve
Purpose: To test operation of pressure differential relief valve.
Requirements: The pressure differential relief valve must operate to main-
tainthe"zone"betweenthetwocheckvalvesatleast2psi(14kPa)less
than the supply pressure.
Step1 Closeneedlevalve"C"bypass(yellow).
Step2 Openneedlevalve"A"highside(red).
Step3 Openneedlevalve"B"low(blue)veryslowlyuntilthedifferential
gauge needle starts to drop.
Step4 Holdthevalveatthispositionandobservethegaugereading
at the moment the first discharge is noted from the relief valve.
Recordthisastheopeningdifferentialpressureoftherelief
valve.Note:itisimportantthatthedifferentialgaugeneedle
drops slowly.
Step5 ClosetestcocksNos.2and3.Removehosefromtestcocks
Nos.2and3.
Step6 Usebypasshose(yellow)torelievepressurefromtestkitby
openingneedlevalve"A","B"and"C"andbleedvalves"A"and
“B”.
Step7 RemovealltestequipmentandopenNo.2shutoffvalveofthe
device.
Bleed Valve A
Bleed Valve B
High
(red)
Bypass
(yellow)
3
Low
(blue)
860 Shown