Check-valve assembly, in particular for a pressurized water reac

Details Check-valve assembly, in particular for a pressurized water reac Check-valve assembly, in particular for a pressurized water reac

1987-03-09

1988-07-12

Rivell, John

Fluid handling

Line condition change responsive valves

Direct response valves

13751611, 13751627, 251127, F16K 2110

Patent

active

047563346

ABSTRACT:
This check-valve assembly, adapted to close a fluid flow circuit without creating overpressures or hammering in this circuit, comprises a tubular body (1) connected at both of its ends to a respective pipe section (2, 3), a closure member (4) mounted to be movable inside the body (1) between an open position in which the fluid may circulate in the direction of arrow F1 and a closed position in which the closure member bears against a seat (21) so as to cut off any circulation of this fluid in the direction of arrow F2. According to the invention, the closure member (4) is axially slidably mounted in the body (1) and delimits a cylinder (4a) cooperating with a fixed piston (11) so as to constitute a restraining device which becomes more effective when the closure member approaches its closed position. Simultaneously, the reverse flow of the fluid (direction F2) is progressively limited by passage in a path (24, 25) having a relatively high pressure drop.

REFERENCES:
patent: 693513 (1902-02-01), Golland
patent: 1105255 (1914-07-01), Caskey
patent: 1356238 (1920-10-01), Taylor
patent: 1385932 (1921-07-01), Stayman
patent: 1684987 (1928-09-01), Hazard
patent: 2490511 (1949-12-01), Courtot
patent: 2622613 (1952-12-01), McNeal
patent: 2693931 (1954-11-01), Leisy et al.
patent: 3107688 (1963-10-01), Caslow
patent: 3954124 (1976-05-01), Self

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