Adjustable packing assembly for valve stem

Details Adjustable packing assembly for valve stem Adjustable packing assembly for valve stem

1990-10-31

1991-11-12

Schwadron, Martin P.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

277105, 251315, F16K 504

Patent

active

050641670

ABSTRACT:
A ball valve (10) has a stem (36) and a packing (82) about the stem (36). A spring (85) comprises a plurality of Belleville washers (86) biased between the upper cover plate (72) and the packing (82) for exerting a compressive loading against follower (84) and packing (82) for sealing against the stem (36). The upper plate (72) has an enlarged diameter bore portion (76) adjacent the valve body portion (12) and Belleville washers (86) including a load transmitting ring (88) over the Belleville washers (86) are received within the enlarged diameter bore portion (76). Manual threaded adjusting screws (94) extend through the upper plate (72) and have inner ends in abutting contact with the load transmitting ring (88) to restore a compressive loading thereon if the Belleville washers (86) lose their capability to apply a sufficient compressive loading against the packing (82). The outer ends of the adjusting screws (94) receive a suitable manual adjusting tool such as an allen head wrench for adjustment of the screws (94). A thrust ring (98) is compressed between shoulder (52) on the stem (36) and the upper plate (74) by adjusting nut (100) on the stem (36).

REFERENCES:
patent: 3916943 (1975-11-01), Hester et al.
patent: 3917223 (1975-11-01), Sidler et al.
patent: 4475713 (1984-10-01), Reed et al.
patent: 4500092 (1985-02-01), Uomala et al.
patent: 4940208 (1990-07-01), Kemp

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