172-65200MA-07 (PCV-1) 8 Oct 2021
9
Disassembly/Reassembly
Use hoisting equipment for heavy objects (weighing approximately
20 kg (44 lb) or more). Failure to do so may result in back strain or other
injury if the object should fall.
CAUTION
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
Be sure to use only the recommended components when repairing the
product, and NEVER attempt to modify the product in any way. Failure to
observe these precautions may result in damage to the product or burns
or other injury due to malfunction or the discharge of fluids.
CAUTION
When the product is disassembled or reassembled, make sure to loosen the
adjustment screw fully so that there will be no load on the coil spring.
Use the following procedures to remove components. Use the same procedures in
reverse to reassemble.
(Installation, inspection, maintenance, repairs, disassembly, adjustment and valve
opening/closing should be carried out only by trained maintenance personnel.)
Part
During Disassembly
During Reassembly
Cover
Loosen nuts (bonnet/cover) and
take out the spring retainer, steel
ball and the coil spring from the
inside after bolts (bonnet/cover)
and cover have been removed
Coat steel ball surface with heat
resistant grease before
reassembly; for bolts and nuts
(bonnet/cover), consult the table
of tightening torques and tighten
to the proper torque
Cylinder
Pull out vertically against the body
Remove and clean the remaining
gasket on the sealing surface and
reassemble
Gasket
(Bonnet/Cylinder)
Remove the gasket and clean
sealing surfaces
Replace with a new gasket; make
sure that the sealing surfaces are
clean
Nut
(Connecting Rod/
Piston)
Pull up the piston by hand until it
stops and hold the connecting rod
with a wrench at the two flat
surfaces on the rod, then remove
the piston by loosening the nut on
the upper part of connecting rod
Consult the table of tightening
torques and tighten to the proper
torque
O-rings
(Piston)
Remove o-rings on the piston
Replace with new o-rings; be sure
to coat surfaces with heat
resistant grease
O-rings
(for Connecting
Rod)
Remove o-rings
Replace with new o-rings; be sure
to coat surfaces with heat
resistant grease
Bonnet
Remove nuts (body/bonnet) and
pull out the bonnet vertically.
Be careful not to scratch the
sealing surface
Remove and clean the remaining
gasket on the sealing surface and
reassemble; consult the table of
tightening torques and tighten to
the proper torque
Connecting Rod
Pull out the connecting rod
together with the valve body
vertically against the body
Insert the valve body connected to
the connecting rod in the valve
seat by making sure that o-rings of
the valve body are in appropriate
places
