Valve

US7740224B2 · kind B2 · utility

Assignee

• HYDAC FLUIDTECHNIK GMBH · DE

Inventors

• Markus Bill · Eppelborn, DE
• Peter Bruck · Althornbach, DE
• Alois Hoffmann · Eschborn, DE

Key dates

• Filing date: Apr 7, 2004
• Grant date: Jun 22, 2010
• Expiry date: Nov 12, 2026

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B2211/75
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A valve, in particular, a proportional seat valve or gate valve, includes a valve housing (10) and at least three fluid connections (1, 2, 3) extending through the valve housing. A main piston (18) extends in the valve housing (10). A pilot piston (24) for executing a pilot control (26) may be controlled by a current-carrying magnetic device (28). During an open pilot control (26), fluid from one (2) of the connectors (1, 2), controlled by the main piston (18), reaches the connector (3), controlled by the pilot piston (24), by a cross-sectional narrowing (38) in the main piston (19). The pilot control (26) and, as a result of the corresponding pressure drop, the main piston (18) achieves a control position, controlling both fluid connections (1, 2) with regard to fluid amount.