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Resetting of the shut-off valve with lever reset
(type SSV 8600)
– c losethedownstreamstopvalve
– s lowlyoperatetheresettinglever27clockwise
untiltheinternalby-passisopen26:
withthisoperationpressurefillstheoutletcham-
ber12,thecontrolchamber19andthedown-
stream pipe, checking on the manometer in-
stalledonthepipeline
Shut-off valve calibration
Theshut-offvalveisusuallysuppliedwithcalibra-
tionvaluesaccordingtotheorderShouldbenec-
essarytomodifythecalibrationvalue,itmustbe
consideredthatthemodificationcanbeeffected
onlywithinthecalibrationrangeofthespringin-
stalled,otherwiseitisnecessarytosubstituteitwith
a suitable spring to be selected referring to the
providedtables
– w henthepressureindicatedonthemanometer
isstabilised,continuetomovethelever27in
order to permit the connection of the control
lever24;atthispointtheleverwillremainstable
ontheopeningposition
After these operations, the shut-off valve is into
operationanditispossibletoproceedslowlywith
theopeningofthedownstreamvalve
Whentheinstalledspringisappropriatetoobtain
therequiredpressure,proceedasfollows:
– over-pressure shut-off operation:
rotateinaclockwisedirectiontheexternalscrewing
ringincreasesthecalibrationvalueorinananti-
clockwisedirectiontoreduceit
– low-pressure shut-off operation:
rotateinaclockwisedirectionthecentralscrewing
ringtoincreasethecalibrationvalueorinananti-
clockwisedirectiontoreduceit
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