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. 11, 2006
Filed:
Sep. 26, 2002
Peter Bruck, Althornbach, DE;
Thorsten Hillesheim, Saarbrücken, DE;
Peter Bruck, Althornbach, DE;
Thorsten Hillesheim, Saarbrücken, DE;
Hydac Fluidtechnik GmbH, Sulzbach/Saar, DE;
Abstract
A pressure regulating valve, in particular a proportional pressure regulating valve, includes a valve body () with at least a pump connection (P), a use connection (A) and a tank connection (T). A piston (), capable of being displaced by a controllable actuating device (), is guided in the valve body (). At the periphery of the piston, a recess () is formed and defines a peripheral annular gap () delimited by the control edges () of the piston (). In the piston (), a passage () provides fluid communication between the front surface of the piston (), subjected to the use connection (A) pressure, and the rear surface () of the piston (), adjacent to a pressure chamber () located behind. The passage () of the piston () has, in the region proximate to the piston front surface, a restriction zone (). In a region away from the restriction zone () towards the rear of the piston surface (), an orifice () faces the peripheral annular gap (), and has a second restriction zone ().