Feedback compensation type hydraulic unloading valve

A feedback compensation and unloading valve technology, which is applied in the field of hydraulic unloading valves, can solve problems such as system damage, load impact, and rapid internal pressure loss, so as to improve efficiency, reduce load unloading opening force, and avoid failure. The effect of pressing too fast

Active Publication Date: 2014-07-09
JIASHAN HANDIJACK TOOLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing spool type unloading valve, the opening inertia of the unloading valve will cause the internal pressure of the system to lose pressure too quickly, and the load will impact, causing system damage

Method used

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  • Feedback compensation type hydraulic unloading valve
  • Feedback compensation type hydraulic unloading valve

Examples

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] see figure 1 and figure 2 , a feedback-compensated hydraulic unloading valve, including an oil circuit board 4, an unloading valve core 6 and a plug 14; the oil circuit board 4 cooperates with the unloading valve core 6 to form a first closed cavity 401, which cuts off Area is S 1 , the first closed cavity 401 communicates with the first oil passage 402 of the oil circuit plate 4; a valve seat 9 with a through hole 901 in the center is provided below the unloading valve core 6, and the cross-sectional area of ​​the through hole 901 is S 2 The lower end surface of the valve seat 9 is provided with a valve ball 10 that can close the through hole; the valve seat 9, the valve ball 10, the unloading valve core 6 and the inner wall of the oil circuit plate 5 form a second closed cavity 403, and the second closed cavity 403 communicates wit...

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PUM

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Abstract

The invention discloses a feedback compensation type hydraulic unloading valve comprising an oilway board, an unloading spool and a plug. The oilway board and the unloading spool form a first sealed cavity in a matching manner, the cross-sectional area is S1, the sealed cavity is communicated with a first oilway of the oilway board, a valve seat with a through hole at the center is arranged below the unloading spool, and the cross-sectional area of the through hole is S2; the lower end face of the valve seat is provided with a valve ball capable of sealing the through hole; the valve seat, the valve ball, the unloading spool and the inner wall of the oilway board form a second sealed cavity which is communicated with a second oilway; the plug seals the lower end of the oilway board, and a valve ball reset component is arranged between the plug and the valve ball; the plug, the valve seat, the valve ball and the inner wall of the oilway board form a third sealed cavity communicated with a third oilway of the oilway board; the first oilway is communicated with the third oilway, the second oilway is an unloading oil return channel communicated with an oil tank, and the cross-sectional area S1 of the first sealed cavity is smaller than the cross-sectional area S2 of the through hole.

Description

technical field [0001] The invention relates to a hydraulic unloading valve, in particular to a feedback compensation type hydraulic unloading valve; it is mainly used to realize pressure release of an oil pressure system, and belongs to the field of unloading valves among pressure control valves of hydraulic control valves. Background technique [0002] The hydraulic system is widely used in various fields of the machinery industry. The unloading valve mainly controls the unloading and loading of the hydraulic system. It is generally used in the hydraulic circuit. The unloading valve uses the control of the hydraulic oil circuit to stop the hydraulic pump or make it Valves that operate under very low differential pressure or unload the hydraulic actuator to realize unloading and loading of the hydraulic system. [0003] At present, the commonly used unloading valves mostly adopt the thread locking type. The structure of this kind of valve body adopts the one-way valve closi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/16F15B13/02
Inventor 傅勇刚王军
Owner JIASHAN HANDIJACK TOOLS
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