Bi-directional snub valve

Details Bi-directional snub valve Bi-directional snub valve

1987-05-04

1988-09-13

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

91397, F15B 1304

Patent

active

047702052

ABSTRACT:
A bi-directional snub valve provides two parallel fluid paths therethrough and means for restricting the fluid flow through each of the parallel paths to one preferred direction. A movable piston is provided with two land portions which selectively are movable into blocking association with two openings in a fluid chamber. Blockage of either of the two openings in the fluid chamber and the corresponding fluid flow path does not effect the ability of the alternate path to conduct a fluid therethrough. The bi-directional snub valve therefore is able to slow the flow of fluid therethrough as a movable object approaches its end-of-travel position. However, because of the nature of the two parallel flow paths, the movable object can be moved away from its end-of-travel position at full speed. A cam arrangement is used to move the piston of the snub valve in response to movement of the movable object.

REFERENCES:
patent: 519639 (1894-05-01), Matthews
patent: 1033181 (1912-07-01), Larsson
patent: 1132203 (1915-03-01), Matthews
patent: 3001511 (1961-09-01), Poyner
patent: 3216446 (1965-11-01), Schmiel
patent: 3319653 (1967-05-01), Stephens
patent: 3489172 (1970-01-01), Whitmore
patent: 3661422 (1972-05-01), Sember
patent: 3866627 (1975-02-01), Dezelan

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