Load holding valve for excavator

A load-holding valve and excavator technology, applied in the field of hydraulic valves, can solve the problems of complex structure, high production cost, large internal leakage, etc., and achieve the effects of good fretting performance, simple and reliable parts, and stable and reliable structure

Active Publication Date: 2021-06-01
龙工(上海)精工液压有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The currently used load holding valve has a certain amount of internal leakage and the internal leakage is relatively large, and the structure is more complicated, the production cost is high, and the pilot control requires a large pressure to open the pilot control spool

Method used

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  • Load holding valve for excavator
  • Load holding valve for excavator

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Embodiment Construction

[0021] In order to make the present invention more obvious and comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0022] The present invention provides a load holding valve for an excavator, such as figure 1 As shown, it includes a first valve body 1, a second valve body 8, and a main valve body. The second valve body 8 is matched and sealed with the main valve body through the third O-ring 11 and the fourth O-ring 17. The first valve body The body 1 cooperates and seals with the second valve body 8 through the first O-ring 7 and is fastened by bolts.

[0023] The main valve body is provided with a main valve body hole, the large cone valve core 19 is installed in the main valve body hole, the large cone valve core 19 and the main valve body hole are precisely matched, and the outer cone surface of the large cone valve core 19 is fitted with the main valve body hole. The inner wall cone surface is sealed and matc...

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PUM

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Abstract

The invention discloses a load holding valve for an excavator. The load holding valve is characterized by comprising a first valve body, a second valve body and a main valve body, and two ends of the second valve body are respectively sealed and fixedly connected with the first valve body and the main valve body. The required parts such as the valve element, the valve body and the valve sleeve are simple and reliable, and the structure that a spring seat and a steel wire check ring compress the valve element is stable and reliable. The area ratio of the pilot valve element to the valve sleeve is very large and reaches about 80, the micro-motion performance is very good, a pilot control valve element can be opened only through small pressure in pilot control, and internal leakage is very low and reaches 2 cc / min or below.

Description

technical field [0001] The invention relates to a hydraulic valve, in particular to a load holding valve for an excavator. Background technique [0002] The load holding system is a necessary hydraulic system in the hydraulic system of the excavator. , It can also perform precise and sensitive micro-control on the loaded actuator, and can improve the stability of the loaded operation, improve the quality of the excavator operation and protect the safety of the operator. [0003] The currently used load-holding valve has a certain amount of internal leakage, and the internal leakage is relatively large, and the structure is complex, the production cost is high, and the pilot control requires a large pressure to open the pilot control spool. SUMMARY OF THE INVENTION [0004] The technical problem to be solved by the present invention is: how to reduce or avoid the internal leakage of the load holding valve, reduce the production cost and facilitate the opening of the pilot ...

Claims

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Application Information

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IPC IPC(8): F15B13/01
CPCF15B13/01F15B2013/004
Inventor 马宗宇余红波夏世亮白永刚杨乐
Owner 龙工(上海)精工液压有限公司
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