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:
Jun. 22, 2004
Filed:
Aug. 23, 2002
Nils T Ottestad, Tønsberg, NO;
Finn Wichstrom, Hvalstad, NO;
Other;
Abstract
A system for controlling the working conditions for mechanical pumps supplying associated devices with pressure fluid via a pipe system. A valve means ( ) is placed between at least one of the pumps and an appurtenant device supplied by the pump, which valve means is arranged to open only when the pump has started up, and by adjustment of its flow cross-section seeks to maintain its downstairs pressure at a value (P ) which is predetermined from the specifications of the pipe system and said device, but gives priority to restrict its flow cross-section so that counterpressure of the pump does not fall below a given minimum value (P ) determined from the characteristic properties of the pump. The valve means is a regulating valve ( ) operating in accordance with this functional principle. The regulating valve is based on a servo function utilising the Upstream pressure of the valve, the valve comprising a main valve body ( ) having an end surface constituting a movable surface in the servo chamber ( ), the volume of the servo chamber, and thereby the flow cross-section of the regulating valve, being regulated by a pair of control valves ( ) affected by the upstream pressure and the downstream pressure, respectively.