Flowserve 800 Globe Valve - Manual (Page 10)

800 Globe Valves FCD ADENIM0008-00
10
9.0 Maintenance Instructions
(Continued)
Reassembly
REASSEMBLY OF THE VALVES is simply the reverse of the disassembly task; also, read the following special
instructions.
First, all dirt, scale and foreign matter should be removed from inside the valve body and bonnet.
Before reassembling the valve, check the seating surfaces to determine that no scratches or minor
imperfections are on the disc or seat ring. If any are evident - lap these surfaces until none are visible.
(Reference Para. 9.3).
9.2 Replacement of Packing (Reference Section 11)
(Refer to Section 11 for referenced part designations.)
(1) Remove the two gland nuts (234) and raise flange gland (133).
(2) Lift the gland flange (133) upward and away from the stuffing box area.
(3) Use a packing hook or similar device to remove the old packing.
(4) Install the packing (110, 112) one ring 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. Do not use a pointed
instrument to push the rings into position. The flange gland (133) can be used for this purpose.
(5) Upon completely filling the stuffing box, lubricate the bolt threads, replace the nuts and very carefully
draw the packing to assure that the gland flange is even and that the bore of the gland flange is
concentric with the valve stem. (If the flange gland (133) is drawn unevenly, scoring the stem may
result; or the gland might be tilted which could cause binding.)
(6) Operating conditions will determine how much to tighten gland bolt nuts. It should be noted that
specific torque values for gland stud nuts (234) usually apply only to live-load spring packages. For
live-loaded valves please consult the live-load spring package supplier, valve assembly or package
assembly drawings.
After tightening the gland stud nuts, stroke the stem and retighten the nuts as required.
(7) Check the packing periodically (6-month intervals), replacing it as needed.