Flow limit shutoff valve

Details Flow limit shutoff valve Flow limit shutoff valve

1982-03-08

1984-09-18

Schwadron, Martin P.

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

13761421, 137501, F16K 1720, F16K 1732

Patent

active

044718039

ABSTRACT:
A flow limit shutoff valve for automatically shutting off all flow between a source of high-pressure gas and a pressure regulator when that flow exceeds a preset flow rate. The flow to the shutoff valve is metered, resulting in lowering the pressure downstream from a metering valve. A main valve has a first chamber on one side downstream from the metering valve, and the valve's outlet is connected to this first chamber. A second chamber on the opposite side is connected to the inlet pressure. The main valve is biased in the opposite direction from that urged by the inlet pressure, so as normally to keep it open, but the main valve snaps shut when the inlet pressure forces overcome the sum of the downstream gas pressure forces and the biasing forces. To enable reopening, a bypass system connects the upstream side of metering valve to the first chamber, while there is a manually operated closure for manually opening and closing off the bypass to the first chamber.

REFERENCES:
patent: 2209956 (1940-08-01), Chase et al.
patent: 2227297 (1940-12-01), Coy
patent: 3538951 (1970-11-01), Bownass

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