IM-P148-37
ST Issue 3
12
6. Maintenance
Note:
Before actioning any maintenance programme observe the 'Safety information' in
Section 1.
Warning
The cover gasket and the main valve gasket (DN40 and DN50) contains a thin stainless
steel support ring which may cause physical injury if not handled and disposed of
carefully.
Servicing:
-
With suitable isolation, repairs can be carried out with the trap in the pipeline.
-
When reassembling, make sure that all joint faces are clean and the dowel locates in the
cover.
How to fit the main valve assembly (CA44S and CA46S):
-
Undo the cover bolts (
2
) and lift off the cover.
-
Remove the float assembly (
8 + 9
CA44 and CA46 only) by extracting the pivot pin (
16
).
-
Remove the support (
14
), pivot frame (
15
) and the valve seat (
5
) by unscrewing the set
screws (
7
).
-
Ensure seat /gasket faces are clean and dry.
-
Fit a new valve seat (
5
) into the body using a new gasket (
6
).
-
Attach the support frame (
14
) and pivot frame (
15
) to body with assembly set screws (
7
)
but do not tighten.
-
Fit the float arm (
8
) to the pivot frame (
15
) using the pin (
16
) and by moving the complete
assembly, centre the valve head (
9
) onto the seat orifice.
-
Tighten the assembly set screws (
7
) to the recommended torque (see Table 1).
-
Check the operation by raising and lowering the float (
8
) several times making sure that
the valve head is centering properly on the seat (
5
).
-
Make sure that all joint faces are clean and refit the cover, ensuring the dowel locates in
the cover, by using a new gasket (
3
) and apply a thin coating of an anti-seize compound to
the cover bolts (
2
).
-
Tighten the cover bolts (
2
) uniformly to the recommended torques (see Table 1).
-
Open up the isolating valve slowly until the full system pressure is achieved.
-
Check for leaks.
How to fit valve cone (CA44 and CA46):
-
Withdraw the pivot pin (
6
) to release the float and lever. Push out the soft valve cone (
9
)
and replace with a new one.
-
Reassemble the float and lever into the pivot frame (
15
) and replace the pin (
16
).
-
Check the operation by raising and lowering the float (
8
) several times making sure that
the valve head is centering properly on the seat (
5
).
-
Make sure that all joint faces are clean and refit the cover, ensuring the dowel locates in
the cover, by using a new gasket (
3
) and apply a thin coating of an anti-seize compound to
the cover bolts (
2
).
-
Tighten the cover bolts (
2
) uniformly to the recommended torques (see Table 1).
-
Open up the isolating valve slowly until the full system pressure is achieved.
-
Check for leaks.
Summary of Contents for CA44
Page 16: ...IM P148 37 ST Issue 3 16...
