Timing valve for the discontinuous metering of a volume flow

US5564458A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolfgang Roth · Zweibrücken, DE
• Johannes Pfetzer · Laufenburg (Baden), DE

Key dates

• Filing date: Apr 6, 1995
• Grant date: Oct 15, 1996
• Expiry date: Apr 6, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/87507
• WIPO field: Control
• WIPO sector: Instruments

Abstract

In a constant timing valve for the discontinuous metering of a volume flow, in particular the flow of cooling water flowing through a heat exchanger of a motor vehicle heater, the volume flow flowing through the valve outlet (17) is maintained constant regardless of the magnitude of the volume flow available at the inlet (16) in the valve housing (15) in that a bypass channel (28) is formed which leads from the inlet (16) to a return (18) and is closed by a spring-loaded, pressure-contro led bypass valve (29). The bypass valve (29) is designed in such a way that the excess volume flow flows off via the return (18) when the connection between the inlet (16) and outlet (17) is not blocked, at least after reaching a given minimum pressure in the bypass channel (28). The integrated bypass valve (29) is coupled with the timing valve (14) in such a way it is compulsorily pushed opened by the timing valve (14) when the timing valve (14) is closed (FIG. 1).