Pressure reducing valve

Abstract

A pressure reducing valve includes main and pilot valves. The pilot valve is configured to regulate a pilot pressure, and includes pilot, drain, and first control-oil ports, a first opening cross section between the first control-oil and pilot ports, a second opening cross section between the pilot and drain ports; and a pilot part. The pilot part is configured to keep the pilot pressure at least substantially constant and control the first and second opening cross sections to be open during a pressure control operation. The main valve is fluidically connected to the pilot port and includes a second control-oil port, an outlet port, a third opening cross section between the second control-oil port and the outlet port, and a control part configured to control the third opening cross section based on the pilot pressure.

Description

technical field

[0001] The invention relates to a pressure reducing valve according to the preamble of claim 1 , in particular a preadjusted pressure reducing valve. Background technique

[0002] A pressure reducing valve maintains a constant output pressure (secondary pressure) as the input pressure (primary pressure) varies.

[0003] Such a pressure relief valve is disclosed in the laid-open document DE 35 37 336 A1. Such a pressure reducing valve has a distribution valve as main stage and a regulating valve as upstream stage. The secondary pressure is regulated within specified pressure limits with the pressure regulating valve. If the secondary pressure exceeds the pressure limit, the spool of the distribution valve is actuated in such a way that the control oil connection is directly connected to the output connection and the connection is no longer made via the regulating valve. The disadvantage of this solution is that the entire pressure reducing valve is prone to...

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