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:
Jul. 07, 2009
Filed:
Oct. 03, 2005
Michael J. Veltri, Pittsburgh, PA (US);
Jeffrey D. Wurzer, Turtle Creek, PA (US);
Michael J. Veltri, Pittsburgh, PA (US);
Jeffrey D. Wurzer, Turtle Creek, PA (US);
Wabtec Holding Corp., Wilmerding, PA (US);
Abstract
A release graduating proportioning valve for a rail car brake system having a brake pipe, a brake cylinder, and a load sensor valve which selectively connects the control volume to the brake cylinder. The release graduating proportioning valve has a proportioning piston movable between a first position at which a control volume is isolated from atmosphere to a second position at which the control volume is connected to atmosphere, to enable graduated release of brake cylinder pressure. A port to atmosphere is provided in the valve body, and the port is connected to, or isolated from, the control volume responsive to movement of the proportioning piston.