Flowserve 1878 Y-Pattern Globe Valves - Manual (Page 10)

9.0 MAINTENANCE INSTRUCTIONS (Continued)
(15) At this time, the disc and seat ring may be lapped if required.
The seating surface should be inspected to determine if
scratches or minor imperfections may be corrected by lapping
and/or if replacement parts are necessary. (refer to Para. 9.3
for lapping instructions).
9.1.2
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 no
imperfections are visible. (Reference Para. 9.3).
Prior to installing the Rapid Change Kit or Bellows Assembly, ensure
that the keyhole in the stem clamp is lined up with the keyway on the
stem. Ensure that the stem clamp is parallel with two of the
stanchion holes to prevent interference with the stanchions once
installed and rotation of the bellows assembly for line up, once
installed into the body.
The following torque values serve only as a guide in determining
approximate gland bolt nut torque values for 1878 Bellows-Sealed
Globe Valves. It should not be necessary to exceed the following
gland bolt nut torques for pressures up to 2735 psi.
VALVE SIZE APPROXIMATE TORQUE
½" thru 1" 6 ft-lbs
1½" & 2" 17 ft-lbs
After tightening gland bolt nuts, stroke the stem and retighten the nuts
as required.
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