Flowserve 800 Globe Valve - Manual (Page 9)

800 Globe Valves FCD ADENIM0008-00
9
9.0 Maintenance Instructions
(Continued)
Disassembly
(6) Rotate the yoke (011) in a counterclockwise direction to remove it from the body (001). At the
same time, the yoke bushing (016) will turn off of the stem (024). Lift the yoke and yoke
bushing up over the stem.
(7) Remove the gland stud nuts (234), allowing removal of the gland studs (205).
(8) 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.
(9) 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 (024) and lift to hold the bonnet, thus preventing it from
rotating.
(10) 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.
(11) The stem (024) and disc assembly (004, 142, 245) can now be lifted from the valve body.
WARNING
Be careful when removing the assembly from the valve body. After removal from the valve, care should be taken to
protect the seating surface of the disc from damage. The disc should be placed in a clean area until ready to replace in
the valve. THE SLIGHTEST NICK OR SCRATCH ON A SEATING SURFACE MAY PREVENT COMPLETE SHUTOFF AND
NECESSITATE EXTENSIVE REWORK OR REPLACEMENT
(12) Remove the retaining ring (245) from the disc (004). Remove the stem retainer nut (142)
from the disc (004) and then slide it up and over the stem (024). Place the disc (004) where it
won’t become damaged or scratched.
(13) At this time, the disc and seat ring may be lapped if required. The seating surface should be
inspected to determine if scratches or minor imperfections may be corrected by lapping
and/or if replacement parts are necessary. (refer to Para. 9.3 for lapping instructions).