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:
May. 24, 2011
Filed:
Jan. 14, 2009
Jorgen Hallundbæk, Græsted, DK;
Jorgen Hallundbæk, Græsted, DK;
Other;
Abstract
The invention relates to a sequence valve for use in a hydraulic plant, which sequence valve has a pressure-controlled slide valve () with a spring return and in a starting position defines a first cavity (), which cavity is connected with a tank and the hydraulic plant, and in a second, pressurized position closes off the connection with the tank. The cavity is connected to a second cavity () via a channel () in the slide valve, and the second cavity is adapted to be connected with a pump via a throttle () and is positioned on the same side of the slide valve as the spring (). The sequence valve has a third cavity (), which is adapted to be connected with the pump and is positioned on the opposite side of the slide valve from the spring, and the second and the third cavity are connected with each other via a fixed throttle with a short flow channel. The invention also relates to downhole tractor with the sequence valve.