Flowserve 1888 Double-Disc Gate Valve - Manual (Page 13)

13
9.0 MAINTENANCE INSTRUCTIONS (Continued)
9.1.1 Disassembly (Continued)
(g) Remove the gland bolt nuts (234), allowing removal of the gland bolts (210).
(h) 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.
(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 (131), 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), wedge and disc assembly (069, 071, 269, 004) 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 falling from the wedges (069, 071) and becoming damaged by falling on the lapped surfaces
(refer to Figure 2).
(I) Remove the discs (004) from the upper wedge (069) and place them where they will not become damaged
or scratched.
(m) The stem (025) can be removed from the upper wedge (069) by sliding it from the “T” slot. Be careful that
the wedges do not separate and the wedge spring (269) is lost.
(n) At this time, the discs and seat rings may be lapped, if required. The seating surfaces should be inspected
to determine if scratches or minor imperfections can be corrected by lapping and/or replacement parts are
necessary. (Refer to Paragraph 9.3 for lapping instructions.)
1888-lb. Double-Disc Gate Valve FCD ADENIM0001-00