IM-S24-15 CH Issue 4
17
4.4 Procedure for renewing the valve plug and seat
- Isolate the valve on both sides.
- Remove the actuator from the valve. Refer to the Installation and Maintenance Instructions
covering Spirax Sarco actuators.
Caution: Care should be taken in removing the bonnet since fluid under pressure may be
trapped between the isolating valves.
- Remove the lock-nut (7).
- Unscrew the four bonnet nuts (13) securing the bonnet to the body and remove the
bonnet (2) complete with the stem and plug (3 + 5).
- Unscrew the gland nut (8), withdraw the stem and plug (3 + 5) and remove and discard the
gland seal set (10 + 11 + 15) along with the gasket (6), taking care not to damage the bore
of the gland nut (8). Clean the bonnet and then replace new stem and plug.
- Unscrew and remove the valve seat (4). Remove the seat gasket (16) and replace with a
new seat gasket.
- Lightly smear the threads of the new seat (4) with silicon grease and screw it into the body.
Tighten to the recommended torque (see Table 1, page 13) ensuring the valve plug is on its
seat.
- Using a new bonnet gasket (12) refit the bonnet (2) onto the valve body. Replace the four
bonnet nuts (13) and tighten to the recommended torque (see Table 1, page 13).
- Fit new gland seal and gasket as described in Section 4.2. If graphite seals are used refer
to Section 4.3. Ensure the valve stem (5) moves freely after assembly.
- Bring the valve back into service.
- Check for any leakage at the gland.
9
7
8
4
3
16
13
15
6
11
2
5
10
12
Fig. 5 LE33 DN15 to DN65 shown
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