Flowserve 1888 Parallel Slide Gate Valve User Manual
Page 8
the stuffing box. Removal of the packing is best
accomplished with a packing hook or similar device.
(i)
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.
(j)
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.
(k)
The stem (025), discs (004), disc carrier (178), and spring
(269), can now be lifted from the valve body. As the discs
(004) 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 (refer to figure 2).
(l)
Remove the discs (004) from the disc carrier (178) and place
them where they won’t be damaged or scratched.
(m)
The stem (025) can be removed from the upper carrier (178)
by sliding it from the “T” slot. Be careful that the discs do not
separate and the spring (269) is lost.
(n)
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 mat be
corrected by lapping and/or replacement parts are necessary
(refer to Para. 9.3 for lapping instructions).
9.1.2 Assembly
Assembly of the valves is simply the reverse of disassembly. Prior to
reassembly, read the following special instructions.
(a)
All dirt, scale and foreign matter should be removed from
inside the valve body and bonnet.