Check valves

Details Check valves Check valves

1978-12-15

1980-05-06

Weakley, Harold W.

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

1375123, 137519, F16K 3112

Patent

active

042012430

ABSTRACT:
A check valve for connection between a source of pressure medium and a pressure medium reservoir to allow passage of pressure medium from the source to the reservoir but to prevent reverse flow from the reservoir to the source.
In order reliably to prevent reverse flow through the valve when the back pressure on the valve is low, the check valve comprises first (31,32) and second (46,50)individual pressure responsive valves in series in a common housing (10), both valves permitting forward flow of pressure medium but, in conditions of zero forward flow, one (46,50) of said valves being firmly closed in response to high back pressures from the reservoir and the other valve (31,32) being firmly closed at low back pressures from the reservoir.

REFERENCES:
patent: 697702 (1902-04-01), Buckley
patent: 1236056 (1917-08-01), Coleman
patent: 3140726 (1964-07-01), Arenhold

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