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Overflow valve with filtering function for main control valve of excavator

A technology for main control valves and excavators, which is applied in the direction of filtration and separation, safety valves, balance valves, etc. It can solve the problems of valve core issuance, etc., and achieve the effects of reduced internal leakage, guaranteed working life, and compact structure

Pending Publication Date: 2020-06-19
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 technical problem to be solved by the present invention is: how to improve the anti-pollution performance and pressure stability of the overflow valve, and avoid the valve core from being stuck

Method used

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  • Overflow valve with filtering function for main control valve of excavator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The present invention is an overflow valve with filter for the main control valve of excavator, such as figure 1 As shown, it includes a valve seat 5, a control spool 9 is set at the front end of the inner cavity of the valve seat 5, the front end of the control spool 9 is closely matched with the inner cavity of the valve seat 5, and a spring seat 8 is set at the rear end of the control spool 9 One end of the spring 7 is connected to the rear end of the spring seat 8, and the other end of the spring 7 is connected to the adjusting bolt 1. Both the spring seat 8 and the spring 7 are located in the inner cavity of the valve seat 5. The front end of the adjusting bolt 1 extends Into the inner cavity of the valve seat 5, the outer peripheral surface of the adjusting bolt 1 is closely matched with the inner wall of the valve seat 5, the two are sealed by the first O-ring 4, and the adjusting bolt 1 passes through the lock nut 2 and the nut 3 Locked and fixed on the valve se...

Embodiment 2

[0023] In this embodiment, an oil inlet inclined hole P and an oil return inner hole T are opened on the valve seat 5 .

[0024] Others are the same as in Example 1.

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PUM

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Abstract

The invention discloses an overflow valve with a filtering function for a main control valve of an excavator. The overflow valve comprises a valve seat with an inner cavity, wherein a control valve element, a spring seat and a spring are arranged in the inner cavity of the valve seat, the front end of the control valve element is in fit connection to the front end of the inner cavity of the valveseat, the spring seat is arranged at the back end of the control valve element and the back end of the spring seat is connected to one end of the spring, the other end of the spring is connected to anadjusting bolt, the outer side of the front end of the adjusting bolt is hermetically connected to the inner wall of the valve seat, the valve seat is provided with at least one oil inlet inclined hole and at least one oil return inner hole, the front end of the outer side of the valve seat and a distance sleeve are in clearance fit, a filter screen is arranged in the distance sleeve, and the filter screen is arranged at the front end outside the oil inlet inclined hole. The overflow valve is compact in structure. By adopting a ridge sealing and guiding design, inner leakage is reduced, and the opening and closing characteristic is improved. Meanwhile, the overflow valve has the characteristics of good pressure stability, good pollution resistance and small effect by pressure fluctuationof the main control valve, so that the service life of the main control valve and the integral stability of an excavator system are guaranteed.

Description

technical field [0001] The invention relates to an overflow valve, in particular to an overflow valve with filter for a main control valve of an excavator, which belongs to the technical field of excavators. Background technique [0002] The relief valve for the main control valve of the excavator is mainly used to control the maximum working pressure of the hydraulic system and protect the safety of the entire hydraulic system. Due to the complex structure of the prior art overflow valve for the main control valve of the excavator, the processing accuracy and processability of the parts are relatively high, the coordination is relatively precise, and the cleanliness of the hydraulic oil is very high, and a little pollution of the oil will make the valve core Card issuance affects the stability of the relief valve and greatly increases the failure rate of the main valve. Contents of the invention [0003] The technical problem to be solved by the present invention is: how...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/02F16K17/06B01D35/04
CPCB01D35/04F15B13/02F16K17/048F16K17/06
Inventor 马宗宇余红波屈方方陈新钻
Owner 龙工(上海)精工液压有限公司