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:
Mar. 29, 2005
Filed:
May. 28, 2003
Dennis R. Barber, Oconomowoc, WI (US);
Dennis R. Barber, Oconomowoc, WI (US);
HUSCO International, Inc., Waukesha, WI (US);
Abstract
A first control valve selectively connects a first port of a double acting actuator to either a pump supply line or a tank return line, and a second control valve selectively connects a second port of the actuator to either a pump supply line or a tank return line. A first pilot operated check valve restricts fluid flow to a direction only from the first control valve to the first workport unless a pilot pressure from the second port is sufficient to open the valve for the opposite flow direction. A second pilot operated check valve restricts fluid flow to a direction only from the first control valve to the second workport unless a pilot pressure from the first port is sufficient to open the valve for the opposite flow direction. A load sense circuit is incorporated to produce signal indicating the greater pressure at the actuator ports.