Throttle valve

US4535966A · kind A · utility

Assignee

• Barmag Barmer Maschinenfabrik Aktiengesellschaft · DE

Inventors

• Karl-Heinz Post · Nittendorf, DE
• Otwin Eich · Remscheid, DE

Key dates

• Filing date: Sep 24, 1982
• Grant date: Aug 20, 1985
• Expiry date: Sep 24, 2002

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B13/0435
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A hydraulic throttle valve is disclosed which includes a choke piston slideably mounted in a bore for movement between an open position and a closed position. A differential piston is coaxially mounted with respect to the choke piston, and a control valve is mounted for slideable movement in a second bore which is laterally spaced from and parallel to the first bore. The control valve is operated by an electromagnet to selectively direct a control fluid to either side of the differential piston, and thereby open or close the choke piston. A feedback spring arm interconnects the choke piston and the control valve, with the spring arm resisting the opening of the choke valve and with the resisting force being a function of the force applied to the control valve by the electromagnet. A balance of forces acting on the choke piston is thereby achieved, with the choke piston being opened to an extend functionally related to the magnitude of the input current to the electromagnet. A shuttle valve is also provided which is operatively connected to each of the hydraulic inlet channel and the hydraulic outlet channel of the throttle valve, with the output of the shuttle valve being operative…