Flowserve 800 Split-Wedge Gate Valve - Manual (Page 9)

9.0 MAINTENANCE INSTRUCTIONS (Continued)
9.1.1 Disassembly (Continued)
(h) Loosen the gland retainer setscrews (220) until they do not make contact with the gasket retainer
(033). Then turn the gland retainer (131) counterclockwise off the bonnet (002). Turn the gasket
retainer (033) out of the body (001). If the bonnet (002) drops and turns with the gland retainer,
grasp the stem (025) and lift to hold the bonnet, thus preventing it from rotating.
(i) Remove the pressure seal gasket (030) by carefully lifting the bonnet (002). It is imperative
that the bonnet be lifted over the stem as straight as possible to eliminate the possible scoring of
the stem. If the bonnet is wedged into position, carefully lift up on the stem until the gasket and
bonnet come free.
(j) The stem (025) and discs (004A and 004B) can now be lifted from the valve body. As the discs
rise above the guides in the valve body, they should be retained to reduce the possibility of them
becoming damaged by falling on the lapped surfaces.
(k) Remove the discs (004A and 004B) from the stem (025) and place them where they will not be
damaged or scratched.
(l) At this time, the discs and seat rings may be lapped, if required. The sealing surfaces should be
inspected to determine if scratches or minor imperfections can be corrected by lapping and/or if
replacement parts are necessary (refer to Paragraph 9.3 for lapping instructions).
9
800-lb. Split-Wedge Gate Valves FCD ADENIM0002-00