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:
Nov. 15, 1994
Filed:
Dec. 18, 1989
James R McBurnett, Greer, SC (US);
Weston R Poyner, Greenville, SC (US);
Dana Corporation, Toledo, OH (US);
Abstract
A hydraulic pressure system includes a pump and a dry valve situated in the inlet of the pump, the dry valve being actuated by a pilot valve capable of capturing the pressure differentials between inlet and outlet of the pump for shifting the dry valve between opened and closed positions. In the dry operational mode, the pump inlet operates at a pressure below atmospheric, thus providing a pressure differential substantial enough to move the dry valve to an opened position. In the preferred form, the pilot valve is a solenoid actuated two-position, four-way, spring loaded valve. The dry valve is a gate valve directly coupled to a fluid control motor.