Flowserve 1878 Y-Pattern Globe Valves - Manual (Page 8)

9.0
MAINTENANCE INSTRUCTIONS
9.1
DISASSEMBLY and REASSEMBLY
The following instructions cover the disassembly and reassembly of the ½”-
2” Y- Globe valves.
WARNING
Prior to performing disassembly, close off the line pressure to
the valve, and release all pressure in the valve.
Extreme care should be taken to ensure that the lower stem (025) and disc
(004) do not separate when removed as one unit until both are adequately
supported. Failure to do so may cause the disc to fall off the stem, and may
cause damage to the disc and/or injury to personnel.
After removal of the disc from the valve, care should be taken to protect the
seating surface from damage. The disc should be placed in a clean area
until it is ready for replacement. THE SLIGHTEST NICK OR SCRATCH ON
A SEATING SURFACE MAY PREVENT COMPLETE SHUTOFF AND
NECESSITATE EXTENSIVE REWORK OR REPLACEMENT.
9.1.1 Valve Disassembly (Refer to figure 1 for reference part numbers)
(1) Relieve pressure from valve.
(2) Place the valve in the closed position and then open the tee-
handle (175) 1-2 revolutions.
(3) Remove the Handwheel Nut (240) from the Upper Stem
(024).
(4)
Remove the Tee-Handle (175) and Thrust Washer (147) from
the upper stem.
(5)
Remove the Gland Stud Nuts (234), and then remove the
corresponding Gland Studs (205).
(6)
Remove the Stanchion Capscrews (280) and Stanchion
Lockwashers (251).
(7)
Remove the Yoke Cap (019). Remove the Thrust Washers
and Needle Bearing (168) (356) if applicable. Rotate the Yoke
Sleeve (017) in a counterclockwise direction to remove it from
the Upper Stem (024)
(8)
Remove the Stanchions (427) from the Body (001).
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