Flowserve 1878 Y-Pattern Globe Valves - Manual (Page 6)

6.0 INSTALLATION INSTRUCTIONS (Continued)
6.2.3
Where possible, install the valves with the stem vertical.
6.2.4
The valves should then be blocked or slung into position with
apparatus that is sufficient to hold the valve assembly weight while
the valve is being welded into the line. WELDING SHOULD TAKE
PLACE WITH THE DISC IN THE OPEN POSITION. Care should be
taken during welding to ensure that foreign material or dirt does not
enter the valve and cause interference with subsequent operation.
6.2.5
Valves are normally shipped pre-packed; if specified otherwise, the
packing is shipped loose with the valve, and should be installed at
this time.
With the valve fully backseated, install the packing, carefully placing
the joint of each ring approximately 180
° from the preceding piece. It
will probably be necessary to slightly flatten each packing ring prior to
installation to allow easy insertion within the stuffing box. The flange
gland can be used to seat the packing in position, one ring at a time.
Upon completely filling the stuffing box, replace the gland stud nuts
(234) and very carefully draw the packing down. (Refer to Section
9.1.2 for bolt torque values). Stroke the valve several times and then
retighten the nuts.
Special
attention should be observed to assure the flange is drawn
evenly and that the bore of the flange is concentric with the valve
stem. If the flange is drawn unevenly, scoring of the stem may result.
6.3
PRE-OPERATIONAL CHECKS
6.3.1 After installation the operation of manual valves should be verified by
closing the valve. The valve should seat tightly with less than 40 lbs.
of push/pull force on the handwheel. If the valve does not close
tightly
DO NOT apply extra leverage; instead refer to Para. 9.4 A and
B.
6.4
OPERATION
6.4.1 After the valves are heated and run in, it may be necessary to draw
the packing to eliminate leakage. In adjusting the packing, the flange
gland should be drawn in as evenly as possible. This can be
accomplished by alternately tightening the gland stud nuts one-half
turn until the packing is tight.
6