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Note: Before actioning any maintenance observe the 'Safety information' in Section 1.
Warning:
The body/cover gasket contains a thin stainless steel support ring which may cause physical
injury if not handled and disposed of carefully.
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. It is
recommended that new gaskets and spares are used whenever maintenance is undertaken. Ensure that the
correct tools and necessary protective equipment are used at all times. When reassembling, ensure that
all joint faces are clean. When maintenance is complete, open isolation valves slowly and check for leaks.
6.1 How to fit the valve and seat assembly:
-
Disconnect the outlet connection and after undoing the bolts (2) remove the cover (1) and valve seat
together with bucket assembly from the body.
-
Unhook the bucket (5) from the valve lever (11).
-
Remove the valve guide plate (7) by undoing the two screws (6).
-
Remove the valve seat (9). The valve seat is spherically ground so that a seal is made at the sealing
face. When fitting a new valve seat, it is extremely important to ensure that thejoint faces are clean, and
STAG jointing compound should be applied to the threaded portion.
-
Screw in a new valve seat (9) (see Table 1 for the recommended tightening torques).
-
Fit a new valve guide plate (7) and lever (11), using new screws (6) supplied. Tighten these after checking
that the valve head is properly aligned to the valve seat orifice (see Table 1 for the recommended
tightening torques).
-
Hook the bucket (5) onto the valve lever (11).
-
Using a new gasket (8), refit the cover (see Table 1 for the recommended tightening torques) and
reconnect the outlet to the pipework.
-
Open the isolation valves slowly until the normal operating conditions are achieved.
-
Check for leaks and correct operation.
6.2 How to fit the check valve assembly:
-
Disconnect the outlet connection and after undoing the bolts (2) remove the cover (1) and valve seat
together with bucket assembly from the body.
-
Remove the check valve (12, 13 and 14) and adaptor (where fitted).
Note: The DN15, DN20 and DN40 units have the check valve screwed directly into the body whereas
the DN25 and DN50 sizes use an adaptor between the body and check valve.
Prior to 1996 the 600 and 900 series used a 'mushroom' pattern check valve.
The new 'ball' design can be fitted into all traps and does not require the spacer tubes fitted on the
earlier 'mushroom' pattern valves.
-
Screw in a new check valve assembly (12, 13 and 14).
-
Using a new gasket (8), refit the cover (see Table 1 for the recommended tightening torques) and
reconnect the outlet to the pipework.
-
Open the isolation valves slowly until the normal operating conditions are achieved.
-
Check for leaks and correct operation.
12
6. Maintenance
IIM-P067-06 CMGT Issue 4
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