Fluid handling – Systems – Flow path with serial valves and/or closures
Patent
1996-04-18
1997-09-23
Lee, Kevin
Fluid handling
Systems
Flow path with serial valves and/or closures
13762532, 251309, F16K 508
Patent
active
056694156
ABSTRACT:
A shut-off device of the double block-and-bleed type comprising a flow passageway accommodating two shut-off members provided with through-going cavities, and a drain means. The flow passageway is provided with an inlet and an outlet. Each of the shut-off members may be moved between a position in which the flow passageway is open and a position in which the flow passageway is closed. In association with the shut-off members two auxiliary chambers are communicating with cavities of the shut-off members. The shut-off device is formed of a single undivided casing. The shut-off members are truncated cone-shaped and mounted in matching truncated cone-shaped recesses in the common casing. As a result, the overall length of the shut-off device may be reduced compared to prior art. Moreover, the tightness at high pressure, e.g. above 100 ato. is enhanced.
REFERENCES:
patent: 611899 (1898-10-01), Freeman
patent: 911546 (1909-02-01), Shields et al.
patent: 1130399 (1915-03-01), Gustafson
patent: 2045113 (1936-06-01), Ward
patent: 3101191 (1963-08-01), Wolfensperger
patent: 4658847 (1987-04-01), McCrone
patent: 4846212 (1989-07-01), Scobie et al.
patent: 5312086 (1994-05-01), Hollingworth
Brdr. Christensens Haner A/S
Dowden Donald S.
Lee Kevin
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