Graco EcoQuip EQ200T - Repairing the Diaphragm Valve

Repair
Repairing Repairing
Repairing
the the
the
Diaphragm Diaphragm
Diaphragm
Valve Valve
Valve
SeeCommonSpareParts,page47forrepairkits.
NOTE: NOTE:
NOTE:
Thediaphragmcanbereplacedwithout
removingtheassemblyfromthepanel.Youwillneed
an8mmAllenwrenchfortheEQ400anda6mm
fortheEQ200.
1.PerformthePressureReliefProcedure,page8.
2.Applymorethan80psi(5.5Bar,MPa)air
pressuretotheregulatorinlettocausethepiston
toretract.
3.Loosenall4Allen-headcap-boltsevenlyand
thenremovethemcompletelywhilesupporting
thecanisterofthediaphragmvalve.
1
EQ200shown,EQ400usestwoshims.
NOTE: NOTE:
NOTE:
Donotdisassemblethecanister.
4.Replacethediaphragm(naturalrubber
compound)andhand-tightenit(onlyasfaras
necessary)toestablishthealignmentwiththe
canister.
NOTE: NOTE:
NOTE:
Thereareoneortwoshimsbetween
thediaphragmandtheactuator.Keepthe
shimsandreusethem(theydonotcomewith
thereplacementdiaphragm).Donotcause
anypre-loadortorqueonthediaphragmby
over-tighteningitinamisalignedposition.
5.Insertall4Allen-headcapboltsandhand-tighten.
6.Tightenthecap-boltsinanalternatingpattern
(seeimagebelow)to80+/-8in-lb(9+/-0.9N•m).
Thiswillcauseaslightbulgeinthediaphragm
betweenthecanisterandthestainlesssteel
casting.
1
2
3
4
7.Relievethepressureappliedinstep2.
8.Testandcon󰘰rmthattheunitisworkingproperly.
NOTE: NOTE:
NOTE:
Thiscanbedoneusingonlywaterto
chargetheequipment–thereisnoneedtouse
abrasiveforthistest.
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