Patent Number: 6,167,906

Title: Bi-directional flow control valve

Abstract: A bi-directional flow control valve includes a two-port housing, and a hollow cage within the housing. The hollow cage has rows of cross-sectional holes that communicate with the ports. A hollow compensating spool is slidably arranged within the hollow cage between the cross-sectional holes. Pressure differential between the ports induces movement in the compensating spool. This movement causes the compensating spool to reduce the opening of one row of cross-sectional holes and increase the opening of the other. In this manner, the valve provides consistent flow control characteristics in each flow direction.

Inventors: Liberfarb; Zilek (Morton Grove, IL)

Assignee: HydraForce, Inc.

International Classification: F15B 13/01 (20060101); F15B 11/00 (20060101); F15B 11/05 (20060101); F15B 13/00 (20060101); F16K 31/06 (20060101); G05D 16/20 (20060101); F16K 031/363 ()

Expiration Date: 01/02/2018