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:
Sep. 28, 1999
Michael Davis, Liverpool, NY (US);
Tactair Fluid Controls, Inc., Liverpool, NY (US);
Abstract
A slide valve containing a ceramic apertured slide block slidably supported upon a pair of ceramic shear seals so that the slide can reciprocate between an operative and an inoperative position. A roof block also formed of a ceramic material is mounted over the slide block and a roller unit is positioned between opposing surfaces of the two blocks. Control pistons are mounted in cylinders on either side of the slide block. Control circuits are arranged to bring pilot fluid in a selected one of the cylinders to extend the piston housed therein against the slide thus changing the slide position. The control circuits are isolated from other circuits within the valve to prevent contaminants from adversely effecting poppet valves operatively associated with the control circuits.