Flowserve 1878 Y-Pattern Globe Valves - Manual (Page 13)

9.0 MAINTENANCE INSTRUCTIONS (Continued)
9.4
TROUBLESHOOTING
A. Excessive Tee-Handle (175) Effort or Binding
Excessive
tee-handle effort or binding would indicate that the Upper
Stem threads or Yoke Sleeve (024) (017) needs to be lubricated; or
the Gland Flange (133) is too tight as a result of the gland nuts being
tightened unevenly. Lubrication (Para. 7.3) should be checked at
regular intervals of 6-months. To tighten the gland nuts evenly, they
should be loosened and retightened in even increments while
checking concentricity between the stem and gland bore.
B. Leakage Between the Disc (004) and Seat (013)
This could be an indication that there is foreign matter on the seating
surfaces in which case the valve should be opened and closed ONE
TIME in an attempt to dislodge any matter that may have
inadvertently lodged there. DO NOT OPEN AND CLOSE THE
VALVE MORE THAN ONCE AS THIS MAY TEND TO CAUSE
PERMANENT DAMAGE TO THE SEATING SURFACES IF THE
FOREIGN MATTER IS SECURELY LODGED IN PLACE. Instead,
disassemble the valve and remove the source of the trouble.
If no foreign matter is found, inspect the seating surfaces of the valve
for signs of a scarred or damaged seat - in which case the seating
surfaces of the Disc (004) and Seat Ring (013) should be refinished
until no visible defects remain. (Refer to Para. 9.3)
C. Leakage Around Upper Stem (024) and thru the Stuffing Box
Indicates
worn Packing (110, 112) and failed Bellows (163). Tighten
the packing, (reference paragraph 9.2(6)) and replace the Packing
and Bellows at the earliest opportunity. The Bellows and Packing
may be replaced with a Rapid Change Kit (reference paragraph
9.1.1(11) and Section 11.0 Figure 1-Note 10).
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