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. 17, 1992
Filed:
Aug. 28, 1991
Applicant:
Inventor:
Jan R de Fries, Wallisellen, CH;
Assignee:
Festo KG, Esslingern, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
13762566 ; 13762525 ; 251167 ; 251172 ; 251174 ; 251175 ;
Abstract
A valve whose housing has valve spool receiving means arranged in it so that the spool is able to move between two switching positions reciprocatingly and is able to connect valve ducts in the housing with each other for the passage of fluid. For this purpose it has window-like transversely extending passages, through which the fluid may flow between two valve ducts. While offering a low resistance to flow the valve design leads to large orifices. Special means are provided for sealing and the control of frictional forces during operation.