Flowserve Cast Flex Wedge Gate Valve - Manual (Page 27)

Cast Flex Wedge Gate Valves FCD ADENIM0010-02
27
7.0 ASSEMBLY
Before starting the reassembly of the valve, all parts should be thoroughly cleaned and inspected, All foreign material should
be removed from any area of the valve. However, there are certain critical areas that must be free of dirt, weld spatter, filing,
etc. These include the following:
1. Disc and seat sealing surfaces
2. Bonnet OD (on pressure seal valves)
3. Body neck ID (on pressure seal valves)
4. Gasket tongue (on flanged bonnets)
5. Gasket groove (on flanged bodies)
6. Bonnet studs and nuts
7. Stem (all)
8. Stuffing box (lD)
9. Gland (all)
10. Pressure seal gasket
The above areas must also be free of any nicks, scratches, gouges, etc. Any damage in these areas must be repaired. Any
questions about the acceptability of any surface condition should be discussed with a service engineer prior to using the part.
7.1
Flanged Bonnet Valves
7.1.1 Disc-Stem Assembly
Prior to installing the disc (004), the stem (025) should be attached. The stem can then be used to lower the
disc in the body. The T-Head of the stem should slide freely in the slot in the disc. When raising the
assembly be careful to hold the T-Head in the disc slot. Failure to do so may allow the disc to come loose
and fall, damaging the sealing surface and possibly injuring personnel. In lowering the disc into the body,
take care not to damage either the disc sealing surface or the neck bore (if it is a pressure seal valve). If the
valve is installed with stem in other than the vertical position, it may be easier to insert the disc in the body
prior to connecting the stem. Once the disc is firmly supported by the guides, the stem can be slid into the T-
Head slot.