High/low safety valve

Details High/low safety valve High/low safety valve

1975-05-05

1976-11-16

Cohan, Alan

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

137467, 137488, 251 86, F16K 1700, F16K 2500

Patent

active

039917843

ABSTRACT:
A high-low shutoff valve of the reciprocating ball type which does not vent fluid to atmosphere upon the closing of the valve in response to operation of either the high or low pressure pilot.

REFERENCES:
patent: 1832341 (1931-11-01), Williamson
patent: 2629578 (1953-02-01), Paul
patent: 2718371 (1955-09-01), Erdman
patent: 2923316 (1960-02-01), Paul et al.
patent: 2935997 (1960-05-01), Abercrombie
patent: 2935998 (1960-05-01), Richardson
patent: 3092136 (1963-06-01), Willis
patent: 3258027 (1966-06-01), Willis
patent: 3749355 (1973-07-01), Paul
patent: 3779508 (1973-12-01), Paul
patent: 3800822 (1974-04-01), Baker

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