Fluid control valves

Details Fluid control valves Fluid control valves

1996-09-12

1998-05-19

Michalsky, Gerald A.

Fluid handling

Line condition change responsive valves

Direct response valves

91446, 137596, 13759613, F16K 1502, F15B 1308

Patent

active

057525463

ABSTRACT:
Fluid control valves are combined to form a layered multi-directional valve, each having a high-pressure port connected to a high-pressure source, a tank port opened to a low-pressure region, an actuator port, a spool capable of connecting said actuator port selectively either to the high-pressure port or to the tank port, and a load check valve capable of blocking the passage of a fluid through the high-pressure port. The load check valve includes a poppet which encloses a spring chamber and is forwardly biased by a spring contained inside the spring chamber. The poppet is movable between a backward position and a forward position inside a valve-containing chamber which has an opening on a portion of the outer wall of the control valve but this opening is blocked by a portion of the outer wall of another similarly structured control valve. When the poppet is moved to its forward position, the poppet comes into contact with a seat disposed inside the high-pressure port to block it, but high-pressure oil on one side of the load check valve in the high-pressure port can flow into the spring chamber through an liquid inlet formed through the poppet. Grooves are formed either on the side of the poppet or on the side of the outer wall of the adjacent control valve which comes into contact with the poppet when the poppet is at its backward position.

REFERENCES:
patent: Re26523 (1969-02-01), Tennis
patent: 3455210 (1969-07-01), Allen
patent: 4519419 (1985-05-01), Petro
patent: 4561463 (1985-12-01), Brownbill et al.

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