Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed
Patent
1990-09-28
1994-12-13
Walton, George L.
Valves and valve actuation
Mechanical movement actuator
Particularly packed or sealed
73 46, 137240, 137312, 251312, 277 2, 277 27, 277 59, 277105, F16K 4104, F16J 1520, F16J 1540
Patent
active
053723520
ABSTRACT:
A novel sealing arrangement for fluid carrying devices and particularly for plug type valves, such as retractable double block and bleed plug valves. The sealing arrangement of the present invention adds secondary and tertiary seals to the conventional packing gland primary seal along the outer surface of the trunnion of such plug type valves. A unique isolated chamber is formed between the secondary and tertiary seals and because of the elastomeric nature of the secondary and tertiary seals, this isolated chamber is bubble tight and thus resists the gradual accumulation of minute leakage, which might otherwise cause false alarms in prior art leakage sensing equipment. Furthermore, the bubble tight feature of a chamber between isolated elastomeric seals, enables purging this chamber for making accurate observations and measurements of true leakage that might otherwise be an environmental hazard. Still more significantly, the bubble tight aspect of the chamber formed between the secondary and tertiary seals of the present invention, provides a means for providing an over-pressure in the chamber by using an inert fluid, such as nitrogen gas, which significantly increases the sealing efficacy of the present invention, as well as providing both local and remote sensing of leakage prevention status, by simply monitoring the over-pressure condition within the chamber. The chamber may also be evacuated to provide enhanced leak detection capability.
REFERENCES:
patent: 2635903 (1953-04-01), Hansen
patent: 2691773 (1954-10-01), Lichtenberger
patent: 3209830 (1965-10-01), Orr et al.
patent: 3307574 (1967-03-01), Anderson
patent: 3429555 (1969-02-01), Wrenshall
patent: 3827285 (1974-08-01), Grove
patent: 3991974 (1976-11-01), Bonafous
patent: 4010769 (1977-03-01), DeLorenzo et al.
patent: 4022424 (1977-05-01), Davis et al.
patent: 4230299 (1980-10-01), Pierce, Jr.
patent: 4353388 (1982-10-01), Isoyama et al.
patent: 4383546 (1983-05-01), Walters, Jr.
patent: 4660591 (1987-04-01), Brown et al.
patent: 4901751 (1990-02-01), Story et al.
patent: 4916938 (1990-04-01), Aikin et al.
patent: 4972867 (1990-11-01), Ruesch
patent: 5078175 (1992-01-01), Martin et al.
Smith Gordon M.
Van Der Wiel Hans M.
Johnston Pump/General Valve Inc.
Tachner Leonard
Walton George L.
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