Flowserve 800 Split-Wedge Gate Valve - Manual (Page 10)

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9.0 MAINTENANCE INSTRUCTIONS (Continued)
9.1.2 Assembly
Assembly of the valves is simply the reverse of disassembly. Prior to reassembly, note the following
special instructions.
(a) All dirt, scale and foreign matter should be removed from inside the valve body and bonnet.
(b) Check the seating surfaces to determine that scratches or minor imperfections do not exist on the discs or
seat rings. If any are evident, lap these surfaces until no visible defects remain. (Reference Paragraph 9.3.)
(c) Position the discs (004A and 004B) onto the stem (025). As the stem and disc pack are lowered into the
valve body, they should be contained to reduce the possibility of falling and becoming damaged.
(d) Once the stem/disc pack assembly is positioned into place, the bonnet (002) can be lowered into the body
neck. Care must be taken in lowering the bonnet onto the stem to prevent possible scoring.
(e) With the bonnet resting inside the body neck, a new pressure seal gasket (030) can be inserted. Because
the tolerances are close and the gasket could cock, the seal gasket must be inserted with care.
(f) Thread the gasket retainer (033) into the body; tighten to the bottom of the threads and back out enough to
align the packing gland bolts onto the valve body. With the gasket retainer in the proper position, the gland
retainer (131) can be lowered over the stem and threaded onto the bonnet (002). The bonnet will be raised
squarely until it is firmly in contact with the pressure seal gasket.
800-lb. Split-Wedge Gate Valves FCD ADENIM0002-00