Flowserve 800 Globe Valve - Manual (Page 6)

800 Globe Valves FCD ADENIM0008-00
6
6.0 Installation Instructions
(Continued)
6.2 Installation (Continued)
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. It is NOT necessary to
disassemble the valve prior to welding in the line; however, 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. For valves
with resilient seats - caution should be exercised so that the resilient seat material is not subjected to
temperatures greater than 400
°
F.
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.
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 and very carefully draw
the packing down. 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.