Operating instructions

IM-P623-04 ST Issue 5
11
6.4 Disassembly and service
1. Shut the trap inlet and discharge valves, vent the pressure and allow the trap to cool
sufficiently to prevent possible injury from hot surfaces.
2. Remove the blind nut (11).
3. Remove the six cover nuts (9) and the cover (8).
4. Remove the strainer screen (4) and clean or replace.
5. Note: The valve and bimetallic element assembly (3) is assembled loosely. Carefully lift
these as one piece from the body (
1). Take the necessary precautions to ensure that
the bimetal element arrangement is not disturbed. Inspect the valve plug for wear.
6. Remove the valve opening spring.
7. Remove the valve seat (12) with a 36 mm A / F (1 ") pipe wrench. Inspect the valve
seating
surface and the check valve seat for wear.
8. Remove the check valve ball (13) and check valve spring and inspect for wear.
9. Clean all gasket surfaces and remove dirt/scale from the trap internals with a wire
brush or
equivalent. Be careful not to damage the sealing surfaces.
10. Blow out the trap inlet piping and clean the upstream strainer if applicable.
11. The bimetallic assembly kit (see Section 7, Spare parts) consists of the bimetallic element (3),
valve seat gasket (
2), cover gasket (7), blind nut gasket (10), strainer screen (4), valve
seat
(12), check valve ball (13) and check valve spring (14).
Fig. 3
11
Locking gland nut 6
10
9
3
Adjustment screw
8
4
2
7
1
Valve
opening
spring
12
13
14
Check valve
Adjustment screw tube