Pressure valve

US6196201A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolfgang Fehlmann · Stuttgart, DE
• Ruben-Sebastian Henning · Stuttgart, DE
• Walter Fuchs · Stuttgart, DE
• Stephan Jonas · Gerlingen, DE
• Kiyotaka Ogata · Saitama, JP

Key dates

• Filing date: Apr 30, 1999
• Grant date: Mar 6, 2001
• Expiry date: Apr 30, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7774
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A pressure control valve for installation in a supply line between a pump work chamber of a fuel injection pump and an injection point in the engine to be supplied. A valve body that has a first valve seat and an axial through conduit in which a pressure control valve closing member is guided. The pressure control valve closing member opens toward the injection point counter to the force of a first valve spring and has a sealing face that cooperates with the first valve seat, as well as with an axial through bore in the pressure control valve closing member. The bore can be closed by a back-flow valve that opens in the direction of the pump work chamber and has a second valve spring. For an optimal, unthrottled fuel flow through the pressure control valve, fuel conduits are respectively formed between the radially outer circumference faces of the first and second valve springs and the housing walls that encompass them, through which conduit the fuel flows in an unthrottled fashion.