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SECTION 23—LEAK TEST

Perfecto

2

™

78 Part No 1148070

4 Way Valve Function Test

NOTE:Forthisprocedure,refertoFIGURE 23.1onpage 77.

The4‐wayvalveusedinthePerfecto2SeriesConcentratorsdoeshaveanacceptable

toleranceofleakageperRexRoth

®

.

Bynatureofthevalvedesignitispossibleforthevalvetoexperiencesmallleaks,andstill

operatewithoutaffectingtheoverallperformanceoftheunit.Thevalveisassembled

wherethecomponentsthatmakeupthevalve“Snap”together.Theonlyscrewsinthe

valveareforsecuring

thevalvetothemanifoldassembly.

AccordingtoRexRoththereisanacceptableleakspecificationof60ccperminuteat20

psioneachvalve.Valvesthathaveleakswithinthisspecificationwillfunctionproperly

withoutanyadverseeffectstotheperformanceoftheconcentrator.Aleakintheamount

of60ccorlesswouldbeindicativeofthetypeofsmallleakyouwouldnoticewherethe

endcapsconnecttothemainbodyorwherethethreepiecesofthemainbodyconnect

together.A60ccleakwouldnotbenoticeablewhenexaminingthesystempressure

swings.



Leaksgreaterthan60ccareindicativeofcracksintheendcaps,orablownsealwherethe

endcapconnectstothemainbodyofthevalve.Theseleaksaredetectedbyeitherreading

thesystemswingpressures,noticingtwoconsecutiveswingsnotbeingequalorby

hearinganaudibleleakeveryothercycle.Leaksofthisextremenatureindicatethevalve

needstobereplaced.

Valvesshouldonlyneedtobereplacedwhenthefollowingconditionsexist:

1. Avisiblecrackisnotedoneitheroftheendcapsormainbodyofthe4wayvalve,

regardlessoftheamountofleak.

2. Alargeleakispresentonthevalvethatcausesanimbalanceinthesievebedswing

pressures.Example:SieveBed1pressureswingsfrom14psito16psi,within7‐20

secondsandSieveBed2pressureswingsfrom13psito16psislowly,andmaytake

aslongas25‐30secondsbeforeshifting(timesover30secondwillshutdown

automatically).

3. Valvewillnotshiftandthepilotvalvesolenoidandcircuitboardareworking

properly.

NOTE:Theconcentrator’sP.C .B .shouldexhibitanerrorcodeforHighPressureFailure(1Red/

2Green).

NOTE:Thebestmethodtotestthe4‐wayvalveoperationisbymeasuringtheunitpressure

swings.ThiscaneasilybedoneattheHomeFillportwitha0‐30psipressuregaugeanda¼”fill

lineadapter.Uponstartingtheunitshouldbuildpressureupto16psifor

outputflows3L/min

andbelowor21psiforoutputflows4L/minandabovebeforeitsinitialshift.Aftertheinitialshift

theunitshouldshiftconsistentlyinequalamountsoftime+/‐1second(timerecordedinseconds).

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