Metal working – Method of mechanical manufacture – Valve or choke making
Patent
1991-01-22
1992-03-24
Cuda, Irene
Metal working
Method of mechanical manufacture
Valve or choke making
29451, B21D 5300
Patent
active
050975951
ABSTRACT:
A liveload assembly including a stack guide, compressed belleville washers stacked inside the stack guide and a retainer to hold the compressed washers in the stack guide. A longitudinal slot in the wall of the stack guide permits visual checking of the compression provided by the liveload assembly on the gland follower of the valve or pump. The rotary or reciprocating shaft of a valve or pump is liveloaded by placing the liveload assembly over the bolt securing the gland follower to the stuffing box. A nut is threaded on the bolt until it contacts the washers and the retainer removed.
REFERENCES:
patent: 2947320 (1960-08-01), Oxby et al.
patent: 3873079 (1975-03-01), Kuus
patent: 3884268 (1975-05-01), Wagner et al.
patent: 4106170 (1978-08-01), Schoeneweis
patent: 4571133 (1986-02-01), Lindow
patent: 4607421 (1986-08-01), Zemek et al.
patent: 4651981 (1987-03-01), Passiniemi
Electrical Power Research Institute's paper prepared by Foster-Miller, Inc. Waltham, MA entitled "Valve Stem Packing Improvements", EPRINP-4255, Project 2233-3, Interim Report, Feb. 1986, including topics on valves, seals, maintenance, materials testing and leakage.
Cuda Irene
Pressure Services, Inc.
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