Integral plugged electric-hydraulic control reversing valve with classified filtering function

Abstract

The invention discloses an integral plugged electric-hydraulic control reversing valve with a stage filtering function, comprising a support filter, a pilot valve filter and a reversing valve set. The integral plugged electric-hydraulic control reversing valve with the stage filtering function is characterized in that the support filter and the pilot valve filter are integrally arranged in the reversing valve set; the reversing valve set is provided with a liquid inlet, a first liquid inlet and a second liquid outlet, and the liquid inlet is communicated with the support filter; and the support filter and the pilot valve filter are arranged between passageways. The electric-hydraulic control reversing valve integrates the support filter and the pilot valve filter into a whole main valve body to form a plugged structure; a high-pressure liquid is filtered by the support filter, one path of the liquid directly enters a valve core high-pressure port of the integral main valve, and the other path of the liquid enters the pilot valve filter and provides liquid for the pilot valve after secondary filtering. The pilot valve and the main valve have different requirements on filtering precision of a working medium, the pilot valve requires high cleanliness of the working medium and small amount of liquid quantity while the main valve requires relatively lower cleanliness of the working medium and large amount of liquid quantity, therefore, the stage filtering function can effectively control the cleanliness of the work medium and ensure the normal use of the main valve and the electro-magnetic pilot valve.

Description

technical field [0001] The invention relates to an integral plug-in electro-hydraulic control reversing valve with graded filtering function, in particular to an integral plug-in electro-hydraulic control reversing valve with graded filtering function for a hydraulic support. Background technique [0002] The electro-hydraulic control reversing valve is an important control core component of the electro-hydraulic control system, and its pilot valve part realizes the control of small flow to large flow. Due to the small stroke of the internal valve stem of the pilot valve, the cleanliness of the fluid medium is relatively high. In order to ensure the cleanliness of the fluid medium flowing through the pilot valve, a filter is added in the valve body of the electro-hydraulic control reversing valve. The precision of channel filtering is generally higher. Now the filter system of the electro-hydraulic control reversing valve of the hydraulic support is composed of two parts, t...

AI Technical Summary

Problems solved by technology

[0004] Tubular filter: The initial investment cost of the tubular filter is low, the structure is simple, and the initial installation is convenient; the disadvantage is that once the system is polluted, it is inconvenient to replace it underground, and it is easy to cause secondary pollution, and the subsequent operation cost is high

[0007] The above prior art has at least the following disadvantages: although the manual backwashing filter can realize backwashing, this kind of filter has a large volume and requires two filter elements, which is costly and unfavorable for replacement

Difficult to replace the tube filter, easy to secondary pollution

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