Flow control valve and control method therefor

Details Flow control valve and control method therefor Flow control valve and control method therefor

1995-04-28

1996-06-11

Nilson, Robert G.

Fluid handling

Processes

With control of flow by a condition or characteristic of a...

137486, G05D 706

Patent

active

055246591

ABSTRACT:
The present invention provides a flow control valve which makes it possible to prevent the leakage of hydraulic fluid when the valve is closed while continuously controlling the flow rate. An axially slidable piston (12) housed in a housing (11) provided with a first port (13) and second port (16) is urged by an electromagnet (20). A first closing valve (14) for connecting and isolating the first port (13) and first fluid chamber (A), with a valve seat portion (14C) opened opposite one end portion of the piston (12) in the first fluid chamber (A) and a valve body (14B) which is seated in and separated from the valve seat portion in accordance with the axial displacement of the piston (12), is provided between the first port (13) and the first fluid chamber (A). An orifice (15) is provided in the conduit connecting the first fluid chamber (A) and the second fluid chamber (B).

REFERENCES:
patent: 2272684 (1942-02-01), Vickers
patent: 3502100 (1970-03-01), Jonson
patent: 3729018 (1973-04-01), Butterfield
patent: 4206781 (1980-06-01), Salter
patent: 5018797 (1991-05-01), Takata
patent: 5127435 (1992-07-01), Takata
patent: 5137339 (1992-08-01), Brown
patent: 5190068 (1993-03-01), Philbin
patent: 5215357 (1993-06-01), Brown
patent: 5261731 (1993-11-01), Togo et al.

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