Valve with noise reducing two stage pressure drop

US5417244A · kind A · utility

Assignee

• TRW Limited · US

Inventors

• Herman W. Behrens · Rancho Palos Verdes, US
• Wendell L. Gilbert · Pleasant Shade, US
• George M. Harpole · Rancho Palos Verdes, US
• Jane M. Lin · Rancho Palos Verdes, US
• Michael F. Wolff · Torrance, US

Key dates

• Filing date: Feb 7, 1994
• Grant date: May 23, 1995
• Expiry date: Feb 7, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86654
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A valve for controlling flow of hydraulic fluid. The valve includes first and second relatively movable valve members (60 and 62). The valve members (60 and 62) include cooperating surfaces (112, 142, 144) which define first and second orifices for metering fluid from a pressurized fluid source (44) toward first and second locations (22 and 24) in a fluid utilization device (12). The valve members (60 and 62) have a displaced position in which the first orifice is increased in size and the second orifice is decreased in size. The increased size of the first orifice reduces a pressure drop across the first orifice. The decreased size of the second orifices increases a pressure drop across the second orifice. The valve members (60 and 62) include means (114 and 146) for increasing a pressure on a downstream side of the second orifice to reduce the pressure drop for controlling valve noise.