Flowserve 1878 Y-Pattern Globe Valves - Manual (Page 9)

9.0 MAINTENANCE INSTRUCTIONS (Continued)
(9)
Loosen the Stem Clamp Setscrews (221) and remove the
Stem Clamp (029) and Stem Clamp Key (255).
(10)
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.
(11)
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).
Note: The bellows is seal welded to the bonnet and stem and is an
assembly. The assembly is referred to as a Rapid Change Kit,
and is comprised of all trim parts, stem, bellows, bonnet, and
pressure seal gasket. The Rapid Change Kit is a complete
assembly and must be removed and replaced as such.
(12)
Remove the Pressure Seal Gasket (030) by carefully lifting the
Upper Stem (024), (including the attached bellows assembly)
from the Body (001). It is imperative that the bellows
assembly be lifted out of the body 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.
Note:
The Disc (004) and Disc Skirt (005) are attached to the stem
by the use of a Stem Retainer (028) and Disc Skirt Pin (265).
(13)
The Disc (004), and Disc Skirt (005), can now be removed
from the stem.
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
(14)
Remove the Disc Skirt Pin (265) from the Skirt (005).
Unthread the Disc (004) from the Disc Skirt (005). Place the
disc (004) where it won’t become damaged or scratched.
Remove the Stem Retainer (028) and Disc Skirt (005).
9