IM-P145-02
ST Issue 2
10
6. Maintenance
Note: Before actioning any maintenance programme observe
the 'Safety information' in Section 1.
Warning
The cover gasket contains a thin stainless steel support ring which may
cause physical injury if not handled and disposed of carefully.
6.1 General information
Before undertaking any maintenance on the trap it must be isolated from both the supply line
and return line and any pressure allowed to safely normalise to atmosphere. The trap
should then be allowed to cool. When reassembling, ensure that all joint faces are clean.
Note: The following Sections need to be read in conjunction with Figure 5.
6.2 How to fit the main valve assembly
-
Undo the cover bolts (
2
). Place two screwdrivers between the body and cover on either side
and lever off the body, keeping bolt holes aligned.
-
Remove the pivot pin (
14
) and float assembly (
8
).
-
Remove the two main valve assembly screws (
7
) and pivot frame (
12
).
-
Remove the main valve seat (
5
) and replace with a new seat supplied with new gasket and
tighten to the recommended torque (see Table 1, page 8).
Note:
A valve spring (
16
) is fitted to the DN25 (1") traps only.
-
Refit the pivot frame (
12
) by tightening the assembly set screws (
7
) to the recommended
torque (see Table 1). Replace float assembly (
8
) and pivot pin (
14
) .
-
Fit a new 'O' ring (
15
) onto the body ensuring that the 'O' ring contact surfaces are all clean
and in good condition. Care must be taken to ensure that the 'O' ring is not damaged during
assembly. A suitable lubricant may be used to ease assembly.
-
Refit the cover using a new gasket (
3
) and tighten the cover bolts (
2
). This is relevant to all
configurations.
6.3 How to fit the air vent assembly
-
Remove the spring clip, element and spacer plate.
-
Unscrew the seat (
9
) and remove along with the gasket (
6
).
-
Fit a new gasket, seat and frame and tighten to the recommended torque (see Table 1).
-
Assemble the spacer plate, fit capsule and clip.
-
Align the complete air vent horizontally so that the frame clears the cover.
6.4 How to replace the strainer screen (where fitted)
-
Remove the cover bolts (
2
).
-
Place two screwdrivers between the body and cover on either side and lever off the body.
-
Remove the strainer screen and either clean or replace it.
-
Ensure the screen is located securely between the two lugs either side of the outlet passage.
-
Refit the body and tighten the bolts to the recommended torque (see Table 1). Always use
a new 'O' ring (
15
) and body gasket (
3
).
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