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Hydraulic valve

一种液压阀、液压介质的技术，应用在液压阀领域，能够解决压力冲击大、驱动机构和/或开关影响等问题

Active Publication Date: 2012-11-28
HITACHI ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It has been found, for example, that in the case of the use of two-stage switchover valves in hydrodynamic spring-loaded drives for high-pressure switching devices, the pressure surges in the hydraulic system can be so great that the drive and / or the switch are thus subjected to influences

Method used

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  • Hydraulic valve

Examples

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Effect test

Embodiment Construction

[0018] figure 1 A section through a changeover valve 10 is shown, in which a valve body 12 is shown, which is not shown in the lower half but is indicated by the line of symmetry 14 of the valve body 12 . The valve body 12 can move back and forth in the valve housing 16 along the direction of the axis of symmetry 14 .

[0019] The valve housing 16 has a first channel 18 which, in the example shown, is in the form of a cylindrical bore and is arranged to the right in the drawing. In this case, the first channel 18 communicates with a pressure accumulator, here a high-pressure accumulator, which supplies hydraulic oil at a defined pressure. This hydraulic oil is delivered via a high-pressure line (not shown) via first channel 18 to switchover valve 12 .

[0020] The valve body 12 is shown in a position that completely closes the first channel 18 , and this position is referred to as a first end position. The sealing between valve body 12 and valve housing 16 takes place at a ...

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Abstract

Hydraulic valve ( 10 ) having a valve body ( 12 ) in a valve housing ( 16 ), which has a first ( 18 ), a second ( 20 ) and a third ( 22 ) cutout. A hydraulic medium can be fed via the first cutout ( 18 ), the hydraulic medium can be fed to a pressure consumer via the second cutout ( 20 ), and the hydraulic medium can be fed to a pressure sink via the third cutout ( 22 ). The valve body ( 12 ) moves to and fro between two end positions, in which case, in the first end position, the hydraulic medium passes from the first ( 18 ) to the second cutout ( 20 ), and, in the second end position, the hydraulic medium passes from the second ( 20 ) to the third cutout ( 22 ). Owing to the valve body ( 12 ), a constant flow cross section for the hydraulic medium, which is released by the first cutout, arises during a switching operation from the first into the second end position in a fixed time span, with the result that a maximum flow cross section is achieved when the valve body ( 12 ) is in the second end position and, in addition, the flow cross section differs from the maximum flow cross section.

Description

technical field [0001] The invention relates to a hydraulic valve having a valve body within a valve housing having a first, second and third passage. Hydraulic medium can be supplied via the first channel. Furthermore, the hydraulic medium can be supplied to the pressure load via the second channel and the hydraulic medium can be supplied to the pressure outlet via the third channel. The valve body is movable back and forth between two end positions in which hydraulic medium flows from the first passage to the second passage and in which hydraulic medium flows from the second passage to the third passage. Background technique [0002] Hydraulic valves of this type are known and are also referred to as switching valves. In this case, the switching takes place by relatively rapid back and forth movement of the valve body. If the flow cross section for the hydraulic medium is released relatively quickly through the valve body, this can cause undesired pressure surges in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/02F16K11/044
CPCF16K11/044Y10T137/8671Y10T137/86686
Inventor H·洛尔伯格D·J·沃尔菲
Owner HITACHI ENERGY LTD