Flowserve Selfacting pressure regulator: EN

Contact the manufacturer if the prevailing installation conditions mean that the

valve will have to be tted horizontally.

• Isthereasuitablesurgesectionupstreamanddownstream

EN

ofwherethevalveisinstalled?

The absence of a surge section can create critical operating conditions and

cause impermissible levels of noise and vibration!

• Isappropriateequipotentialbondingprovided?

Impermissible electrical compensating currents across the valve and the actuator

can generate static and cause electrical discharging.

 Inexplosiveatmospheres,theonlyvalvesthatmaybeusedare

thosethatcomplywiththepermittedgroup,equipmentcategory

andtemperatureclassrequirementslaiddowninDirective94/9/

EC(ATEX)!

Recommended installation Successfuluseoftheautomaticregulatorisconditional

  ontheavailabilityofasuitableinstallationenvironment.

Wesuggestthattherecommendedvaluesbeadheredto,as itisvery importanttotake

accountofphysicalaspectswhenusingtheregulator.Deviationscanresultinsignicant

controldeviations,andintheworstcaseexpensivereroutingofthepipingwillbenecessary.

However,somephysicalprocesseswillpermitadeviationfromthesevalues,althoughinsuch

casessystemknowledgeisrequired,asistheexpressapprovalofthemanufacturer.

Physical requirements

• Automaticregulatorsofthistypeareprimarilyusedforwater vapour,

vapours and gases.Undercertaincircumstancestheycanbeused

withneutral liquids,althoughthepluginowisintheclosingdirection

and“hammer”mayoccurneartheclosingpointatlevelsbelowabout

20%.

• Realisticcontrol ratio 1:10

• A water rundown tankwillberequiredattemperaturesabove 100 °C

topreventthemembranefromoverheating!

• To keep friction losses, wear, hydraulic shock and ow noise to

acceptablelevels,theexitvelocitiesfor

vapours and gasesof70 m/s,and

liquids and saturated steamof8 m/s

 mustnotbeexceeded.

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