IM-P184-17
CMGT Issue 3
12
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TRANSLATION RUN OVER
6.
Carefully remove the old gaskets (
22
) and clean the contact surfaces of the bellows housing. Also ensure
that the mating surfaces of the body and bonnet are clean and free of dirt.
7.
Remove the support cage (
3
) from inside the body.
8.
Lift the seat (
2
) from the body. The gasket may lift with it.
9.
If not, remove the seat gasket (
21
) and clean the contact surfaces.
10.
Fit a new seat gasket (
21
) into the recess, ensuring that it sits flat.
11.
Fit a new seat (
2
) onto the top of the gasket.
12.
Refit the support cage (
3
).
13.
Fit a new gasket (
22
) into the body recess.
14.
Refit the bellows housing (
4
), ensure that orientation of bellows housing is such that counterbore is
uppermost.
15.
Fit a new gasket (
23
) in to the recess of the top of the bellows housing.
16.
Support the bonnet assembly, by holding the bonnet casting horizontally (we recommend clamping in
a vice).
17.
Unscrew the two bonnet bolts that retain the stem couplings (
17
) and remove them from the stem.
18.
Take hold of the plug (
6
) at the end of the stem, so it cannot rotate. Then rotate the handwheel gently
clockwise until the stem is released from the bonnet bush.
19.
Carefully slide the plug and stem assembly (
6+7
) from the bonnet (
5
).
20.
Remove the old gasket (
23
) from the bonnet and clean the contact surface.
21.
Unscrew and the remove the gland nut (
11
).
22.
Remove the gland ring (
10
) and graphite ring (
9
) from the bonnet.
23.
Fit a new graphite ring (
9
).
24.
Refit the gland ring (
10
).
25.
Refit the gland nut (
11
) loosely (do not tighten).
26.
Fit a new gasket (
23
) to the bonnet.
27.
Carefully slide the new plug and stem assembly into the bonnet (take care not to damage any of the
surfaces).
28.
Push the plug and stem assembly into the bonnet bush and rotate the handwheel anti-clockwise until
the thread engages. Keep rotating the handwheel as the plug and stem winds into the bonnet bush.
29.
Wind on several turns until there is enough room to refit the stem couplings (
17
).
30.
Align the flats on the stem to allow the stem couplings to be refitted. Tighten the two retaining screws.
31.
Rotate the handwheel anti-clockwise until the the stem couplings prevent further movement.
32.
Lower the bonnet assembly gently into the bellows housing, making sure that the bonnet fits over the
studs. Check that the underside of the bonnet has aligned with the bellows housing.
33.
Replace the nuts and tighten by hand.
34.
Rotate the handwheel, winding the valve into the closed position (clockwise). Close the valve gently,
do not apply full torque.
35.
Open the valve by unwinding the handwheel by several turns.
Summary of Contents for BSA3HP
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