FORM 119-ING. 04/11
We reserve to modify our production without previous communication
.
7/8
ORDINARY MAINTENANCE PLAN
Check of seat and disc tightness on the plant
Every valve opening
or
every 6-month working.
Check of outwards valve tightness in case of back pressure on the
plant.
Every 30 days.
Check of the painting condition on the plant.
Every 6 months.
Ordinary maintenance of the valve installed on the plant, including the
tightness check and the surface check of the movable components.
Every 12-month working.
General maintenance of the valve removed from the plant including the
disassembling, the seat and the disc check, the incidental seat and
disc lapping, gaskets substitution, painting restoration and test on the
test bench.
Every opening with seats damaging
or
every 24-month working (Group 1)
every 36-month working (Group 2)
DAMAGE TABLE
INCONVENIENT POSSIBLE DAMAGE ACTION TO BE CARRIED OUT
Fluid leakage in-line Seat wear and tear Nozzle substitution or revision
Disc wear and tear
Disc substitution or revision
Seat and disc damaging
Nozzle and disc revision
Impurities presence between seat and disc
Nozzle and disc cleaning and revision
Valve-use with fluid different from the one stated in the
purchase order
Nozzle and disc revision
Valve gaskets damaging Gaskets substitution
Valve body-bonnet damaging Valve revision or substitution
External back pressure fluid
leakage.
Cap or blowdown screw loosen
Check and setting-up of the cap and of the
blowdown screw.
Opening at pressure value
different form setting valve
Back pressure variable
Check of dimensioning and of the discharge piping
working conditions and possible valve substitution
with another type.
Spring release Spring substitution and check compatibility of the
material with the fluid.
Setting screw withdraw
Resetting the valve and tighten very well the lock
nut
Valve intervention with quick
opening and re-closures
repeated in the time
Strong pressure loss in the inlet piping Check the inlet piping length
Not correct setting-up of the blowdown ring Withdraw the blowdown ring until obtain a proper
working, basing the first regulation one table 1; for
liquid fluids withdraw the blowdown ring
completely.
Pulsating flow rate to be discharged Check plant regulation.
Over dimensioned valve Substitute the valve with one correctly
dimensioned.
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