KSB BOA-CVP H, Installation & Operating Manual

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7 Servicing/Maintenance
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BOA-H Mat P
Never use force when dismantling and reassembling the valve.
Original spare parts are only ready for operation following assembly/installation and
subsequent shell and leak testing of the valve.
7.2 Maintenance/inspection
The valve has been designed to be largely maintenance-free.
The materials of the sliding parts have been selected to ensure minimum wear.
7.2.1 Supervision of operation
The service life can be extended by taking the following measures:
▪ Checking the function by actuating the valve at least twice a year
▪ Re-tightening the stuffing box screw to the specified in-service torque in good
time (
ð Section 7.5, Page 30)
7.2.2 Inspection work
7.2.2.1 Checking the PTFE V-packing
A PTFE V-packing set 416 comprises a base ring, three V-rings and a top ring.
The PTFE V-packing set is fitted together with a compression spring 950. It is self-
adjusting, i.e. maintenance-free. If leakage is detected at the stem, the V-packing set
is worn and must be replaced with a new one.
7.2.2.2 Checking the graphite gland packing
The graphite gland packing 461 comprises two packing rings fitted between two
packing end rings. This stem seal design is not maintenance-free.
If regular inspection reveals leakage at stem 200 or a reduction in the tightening
torque of stuffing box screw 45-6, the stuffing box screw must be re-tightened to the
in-service torque specified (
ð Section 7.5, Page 30) .
If re-tightening to the in-service torque does not restore seal integrity, the gland
packing must be replaced. The same applies once stuffing box screw 45-6 rests on the
neck of the bonnet, i.e. when the packing has already been re-tightened to
maximum compression.
7.2.3 Valves with actuator
WARNING
Work on the pneumatic actuator by unqualified personnel
Risk of injury!
▷ Always have repair and maintenance work performed by specially trained,
qualified personnel.
WARNING
Actuator parts moving due to pre-loaded springs when auxiliary energy supply
fails
Risk of injury!
▷
Observe the actuator’s operating manual.