Vermes MDS 3200A - System Maintenance Procedures; Exchange of Tappet Sealing

VTK‐VS‐BA‐004e‐B|UserManualMDS3200A | Maintenance
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9 MAINTENANCE
9.1 MaintenanceIndicator
Theintegrated“CycleCount“functionrelatestothevalveasawholeandispredetermined
bythemanufacturer.Assoonasthepresetnumberofcyclesiscomplete(100%),thered
“maint”LEDonthecontrolpanelislit.Themanufacturer(oranauthorizedsubcontractor)
hastobeinformedat
once.
Inbetween,youcaninspectthecurrentstate.Usethefunction“Maint.Cycle”inthesub‐
menu“Status”(seechapter4.3.4).Theresultisvisualizedbyeightbarsonthescreen,each
ofthemrepresenting12.5%ofthefinalvalue.
Additionalcyclenumberscanindividuallybeagreedfor
tappetandnozzleinsert.Infactory
settings,thevalueof“Infinite”isassignedtobothofthetargets.Iftheuserwishestoenter
aparticularvalue,proceedasfollows,startingfromthefirstmenulevel:
 1x[RightArrow]‐key=Indicatestheintervalforexchangeofthenozzleinsert

 2x[RightArrow]‐key=Indicatestheintervalforexchangeofthetappet
Toenteradesiredfinalvalue,youhavetousethefunctions“SetNozzle”forthenozzleand
“SetTappet”forthetappet.Theyarelocatedinthesubmenu“Status”.Resultsarealsodis‐
playedin
theformof8bars,eachofthemrepresenting12.5%ofthetotalvalue.Once
100%arereached,thered“maint”LEDislit.Thecorrespondingitem(nozzleortappet)has
tobeexchanged.Aftertheexchangeyouhavetoresetthecorrespondingcounterto“0”.
Usethefunctions
“ResetNozzle”or“ResetTappet”insubmenu“Status“(seechapter4.3.4).
9.2 ExchangeofTappetSealing
Forreplacementofseals,aparticularcounterisnotprovided,asthenecessitydependson
currentapplications,substancestobedispensedetc.
Some materials, caused by the tappet movement, tend to penetrate between tappet and
sealing.Thisisgivingrisetoabrasion,sothatthesealinghastobeinspectedfrom
timeto
time. Continuously working with damaged sealing inevitably entails unexpected interrup‐
tions,lossofmaterialandanincreasedneedofcleaning.Insomecases,eventheactuator
canbedamaged,duetotheingressofliquid.
Thetappetsealingisexchangedasfollows:

Step1: Thedispensingprocessmust
becompleted.Thevalveisinclosedposition.
Step2: Closethecompressedairsupply.
Step3: Removethenozzleunit.
Step4: Disengagethefluidboxasfollows:
 Loosenthetwofasteningscrews.
 Carefullydrawoffthefluidboxfromthetappet.Thefluidboxmeanwhileshould
notbe
jammed,otherwisethetappetcanbreak.
Step5: Usethe“Sealmounter“endoftoolMDT301tosqueezeoutthetappetsealing
andthetappetcenteringpiece.AlternativelythethickendoftoolMDT304can
beusedforthispurpose.
Step6: Tomountthecenteringpiecetogether
withthenewsealing,proceedasfollows:
 Firstpinupthetappetcenteringpieceonthemandrelofthe“Sealmounter”endoftool
MDT301.
 Thenplacethenewsealingtothemandrelaswell.Thefacewiththelowerdiameter
pointsupwards.
 Pressbothelementstogether
intothefluidbox(stillusingMDT301).
Step7: Thefluidboxhastobereinstalledasfollows:
 Carefullypushthefluidboxontothetappet.Makesurenottojamit.
 Attachandtightenthetwoscrewsremovedbeforehand(Requiredtorque:1.2Nm–1.4Nm).
Step8: Refixthenozzleunittothefluidbox.
