Resetting of the shut-off valve
Theshut-offvalvemustberesetonlyafterhaving
verifyingthereasonfortheinterventionandafter
havingre-establishednormalconditionsofwork,
proceedingasfollows:
Resetting of the shut-off valve with screw reset
– c losethedownstreamstopvalve
– r emovethecover29,unscrewingit(figa)
Figc
Figa
– s crewitupsidedownintothestem28untilin
comesintocontactwiththecover(figb)
– c ontinuetoscrewitslowly:withthisoperation
(by-pass) pressure fills the downstream pipe
part
– p ullthecoveroutwardsinordertopermitthe
seating of the balls on the stem: the shut-off
valveisreset(figc)
After these operations, screw the cover to it is
housing (figd) and slowly open the downstream
valve
Figb
Figd
35