Safety valves and control apparatus

Details Safety valves and control apparatus Safety valves and control apparatus

1990-04-13

1991-02-12

Cohan, Alan

Fluid handling

Systems

Plural noncommunicating flow paths

405 59, B65G 6530

Patent

active

049916246

ABSTRACT:
Safety valves and control apparatus for generally inaccessible fluid storage facilities wherein a closure mechanism may be attached to an access conduit at an accessible control location and inserted with the conduit into a casing or outer conduit, which closure mechanism may be actuated by control mechanism from the accessible control location to open or close the access conduit or the annulus between the access conduit and the casing, as desired, to permit or interrupt fluid flow, respectively therein. In an underground storage reservoir with access facilities including an outer casing and an inner conduit, separate closure mechanisms may be attached to the inner conduit and inserted therewith along and within the casing to the reservoir, and may be actuated independently to open or close the annulus between the outer casing and inner conduit, and the inner conduit, to thereby control fluid flow in either or both, as desired.

REFERENCES:
patent: 2768840 (1956-10-01), Coberly
patent: 2938383 (1960-05-01), Blackburn
patent: 2981071 (1961-04-01), Brandt
patent: 3056265 (1962-10-01), Swinney
patent: 3068884 (1962-12-01), Naul et al.
patent: 3360048 (1957-12-01), Watkins
patent: 3490240 (1970-01-01), Preston
patent: 4117684 (1978-10-01), Hendrix
patent: 4221234 (1980-09-01), Kruschik
patent: 4392354 (1988-07-01), Schwarzenbach

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