The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 2001
Filed:
Jun. 25, 1999
Applicant:
Inventor:
Zilek Liberfarb, Morton Grove, IL (US);
Assignee:
HydraForce, Inc., Lincolnshire, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K 3/1363 ;
U.S. Cl.
CPC ...
F16K 3/1363 ;
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.