Repair

Repairing Repairing

Repairingthe the

theDiaphragm Diaphragm

DiaphragmValve Valve

Valve

NOTE: NOTE:
NOTE:Thediaphragm(17C127–EQ300,17C128
–EQ600)canbereplacedwithoutremovingthe
assemblyfromthepanel.Youwillneedan8mm
AllenwrenchfortheEQ600Sanda6mmforthe
EQ300S.
1.PerformthePressureReliefProcedure,page8.
2.Loosenall4Allen-headcap-boltsevenlyand
thenremovethemcompletelywhilesupporting
thecanisterofthediaphragmvalve.
3.Replacethediaphragm(naturalrubber
compound)andhand-tightenitasfaraspossible
toestablishthealignmentwiththecanister.
NOTE: NOTE:
NOTE:Therearetwoshimsbetweenthe
diaphragmandtheactuator.Keeptheshims
andreusethem(theydonotcomewith
thereplacementdiaphragm).Donotcause
anypre-loadortorqueonthediaphragmby
over-tighteningitinamisalignedposition.
4.Insertall4Allen-headcapboltsbutdonottighten
them.
5.Applymorethan80psi(5.5Bar,MPa)air
pressuretotheregulatorinlettocausethepiston
toretract.
6.Withthepistonretracted,hand-tightenthe4
Allen-headcapbolts.
7.Releasetheairpressure.
8.Tightenthecap-boltsinanalternatingpattern
(seeimagebelow)to80+/-8in-lb(9+/-0.9N•m).
Thiswillcauseaslightbulgeinthediaphragm
betweenthecanisterandthestainlesssteel
casting.
1
2
3
4
9.Testandconrmthattheunitisworkingproperly.
NOTE: NOTE:
NOTE:Thiscanbedoneusingonlywaterto
chargetheequipment–thereisnoneedtouse
abrasiveforthistest.
30 334667B