Flowserve 800 Split-Wedge Gate Valve - Manual (Page 8)

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9.0 MAINTENANCE INSTRUCTIONS
9.1 The following instructions cover the disassembly and reassembly of a split-wedge gate valve. Typical valve
configuration is shown in Figure 1 (see Section 12.0).
CAUTION
CHECK ONE PRESSURE: IF LINE IS STILL UNDER PRESSURE, VENT
BEFORE VALVE DISASSEMBLY IS STARTED
9.1.1 Disassembly
Extreme care should be taken to ensure that the stem and disc do not separate when removed as one unit,
until both are adequately supported. Failure to do so could cause damage to the disc.
After removal from the valve, care should be taken to protect the seating surface of the discs from damage.
The discs should be placed in a clean area until they are ready to be replaced in the valve. THE SLIGHTEST
NICK OR SCRATCH ON A SEATING SURFACE COULD PREVENT COMPLETE SHUT-OFF AND NECESSITATE
EXTENSIVE REWORK OR REPLACEMENT.
(a) Place the valve in the closed position without wedging the discs into position by closing the valve
and opening about one-half (1/2) of a revolution of the handwheel.
(b) Remove the handwheel nut (240) from the yoke sleeve (017).
(c) Remove the handwheel (136) and handwheel key (135) and handwheel washer (250) from the
yoke sleeve (017) by sliding it up and over the yoke sleeve.
(d) Rotate the yoke (011) in a counterclockwise direction to remove it from the body (001) and slide
it up and over the yoke sleeve (017).
(e) Turn the yoke sleeve (017) off the stem (025).
(f) Remove the gland stud nuts (234), allowing removal of the gland studs (205).
(g) Lift the flange gland (133) upward and remove the packing (110, 112) from the stuffing box.
Removal of the packing is best accomplished with a packing hook or similar device.
800-lb. Split-Wedge Gate Valves FCD ADENIM0002-00