Flowserve 1888 Double-Disc Gate Valve - Manual (Page 15)

15
9.0 MAINTENANCE INSTRUCTIONS (Continued)
9.1.2 Assembly (Continued)
(i) Install the packing into the bonnet in accordance with Section 9.2.
(j) Place the gland bolts (210) into the slots and through the flange gland (133) and tighten the gland stud
nuts (234) (see Section 11.0).
(k) Replacement of the yoke (011), yoke sleeve (017), thrust washer (147), tee handle (175) and
handwheel nut (240) can be accomplished by reversing the procedure specified in Paragraph 9.1.1 (a), (b),
(c), (d), (e) and (f).
9.2 RepIacement of Packing (Reference Figure 1)
If the valve is in service, backseat it. If the valve is not backseated, be sure that line is depressurized.
(Refer to Figure 1 for referenced part designations.)
(a) Remove the two (2) gland stud nuts (234) and raise the flange gland (133), allowing the gland bolts (210)
to be removed.
(b) Lift the flange gland (133) upward and away from the stuffing box area.
(c) Use a packing hook or similar device to remove the old packing.
d) Install the packing (110, 112) a few rings at a time, carefully placing the joint of each ring approximately
180° from the preceding piece to prevent a leakage path. It might be necessary to slightly flatten each
packing ring prior to installation to allow easy insertion within the stuffing box. The flange gland (133) can
be used to seat the packing in position once a ring has been slipped within the box.
(e) Upon completely filling the stuffing box, replace the nuts and bolts. Very carefully draw the packing to
assure that the flange gland is even and that the bore of the flange gland is concentric with the valve stem.
(If the flange gland (133) is drawn unevenly, scoring of the stem may result; or the gland might be tilted,
which could cause binding.) Recommended torque values can be found in Section 11.0.
(f) Check the packing periodically (six-month intervals), replacing as needed.
1888-lb. Double-Disc Gate Valve FCD ADENIM0001-00