Kenco Engineering KDV DumpValve - Manual (Page 3)

TRIM SEAL REPAIR PROCEDURE
1. Make sure all the pressure is off of the pressure vessel and the condensate is drained to a level
below the valve inlet. Also ensure the pressure is off the pneumatic input signal.
2. Disconnect the pneumatic input signal.
3. With a wrench on the union nut and a back-up wrench on the valve body, break the union nut
loose.
4. While removing the union nut, make note of the weep hole. If at any time, pressure is escaping
through the weep hole, STOP! Tighten the union nut and check the vessel shut down and
depressurizing procedures to make sure no pressure is on the valve. NEVER remove the valve
while pressure of any kind, no matter how low, is present in the vessel.
5. With the union nut removed, slide the valve assembly out of the valve body.
Figure 2
6. Loosen the jam nut (#11) and spin it all the way to the top of the maintenance bolt (#10). (See
Figure 2)
7. Screw the maintenance bolt (#10) in until it bottoms and lightly snug. DO NOT OVER
TIGHTEN. This will take the spring load off of the trim plug, allowing for its removal.
8. With a wrench backing up the trim plug (#4) break the lock nut (#1) loose. Once the lock nut is
loose, backing up the trim plug is no longer necessary. The maintenance bolt and diaphragm
assembly will provide the resistance needed to remove to locknut.
9. With the locknut removed, remove the washer (#2), o-ring (3), trim plug (#4), crush washer (#5)
and trim seat (#6). Also remove the o-ring (#8) from the spud (#9) under the union nut. (Note: if
fluid was leaking from weep hole, then replace packing (#26)).
10. Replace all of the parts in the reverse order they were removed. Lubricate the O-rings (and the
packing if replaced) with Parker O-ring lubricant or equivalent.
11. When installing the new locknut (#1) on the trim shaft (#7) screw it on until it just contacts the
trim plug (#4). Then, using a wrench to back up the trim plug (#4) tighten up the locknut (#1).
12. Loosen the maintenance bolt (#10) until the trim plug (#4) is firmly in contact with the trim seat
(#6). Back the maintenance bolt up another couple of turns to make sure it does not come in
contact with the trim shaft during normal operation.
13. Spin the jam nut (#11) down against the housing and tighten. The KDV Dump Valve is ready
for operation.