Pressure reducing valve

A pressure reducing valve and main valve technology, applied in the field of pressure reducing valves, can solve the problem that the pressure reducing valve is easy to vibrate, and achieve the effect of avoiding vibration

Active Publication Date: 2015-09-23
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this solution is that the ent

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Embodiment Construction

[0073] according to figure 1 A pressure relief valve 1 is shown. The pressure reducing valve is a pre-adjusted 3-way-pressure reducing valve. Such pressure reducing valves are used, for example, in load control transmissions of passenger cars, trucks, buses, construction machines or tractors. In addition, it is suitable for many common hydraulic applications, such as for actuating large directional valves, power brakes, fan drives, hydraulic pumps or hydraulic motors. The pressure relief valve is less susceptible to vibration and has less loss of control oil. It can be used for higher pressures and higher pressure medium volume flows.

[0074] The pressure reducing valve 1 has a main stage 2 and a prestage 4 . The main stage 2 has a main valve 6 . The pressure medium connection between the control oil connection P and the outlet connection A and between the outlet connection A and the tank connection T can be controlled by a control element in the form of a control piston...

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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...

Claims

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Application Information

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IPC IPC(8): F15B13/043F16K31/06
CPCG05D16/2093G05D16/2097G05D16/2024Y10T137/7762Y10T137/87209Y10T137/86614F16K17/10
Inventor J.帕斯图施卡L.蔡泽
Owner ROBERT BOSCH GMBH
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