Full-bridge pilot control switch valve

Abstract

The invention belongs to the field of fluid transmission and control, and particularly relates to a full-bridge pilot control switch valve. The full-bridge pilot control switch valve comprises a valvebody and a main valve element, two driving devices are arranged at the two ends of the valve body correspondingly, adjusting cavities are formed between the driving devices and the main valve element, the adjusting cavities are provided with pilot valve elements, the valve body is provided with first through bridges used for enabling the adjusting cavities to communicate with low-pressure oil outlets, and second through bridges used for enabling the adjusting cavities to communicate with high-pressure oil inlets, the pilot valve elements are driven to enable the adjusting cavities to communicate with the high-pressure oil inlets or the low-pressure oil outlets, hydraulic acting force is formed, and thus the main valve element is moved. The full-bridge pilot control switch valve has the following advantages that 1, the main valve element is driven by the hydraulic pressure, and driving force is greatly increased; 2, the pilot valve elements are designed in the valve body, and the sizeis greatly decreased; and 3, the pilot valve elements are designed for controlling the pressure of control cavities in the two ends of a main valve, the flow required for pilot control is quite small,therefore, the driving force for driving the pilot valve elements is quite small, the size of the electromagnetic driving devices is decreased, and energy saving and emission reduction are achieved.

Description

technical field [0001] The invention belongs to the field of fluid transmission and control, and in particular relates to a full-bridge pilot control on-off valve. Background technique [0002] Fluid control valves, especially hydraulic valves, play the role of controlling flow, pressure and switching oil circuits. For example, the electromagnetic switching valve plays the role of controlling the flow and switching the oil circuit; the electromagnetic switching valve is divided into: single-stage valve (direct acting valve) and two-stage valve (pilot control valve) according to the flow capacity. In the industry standard, single-stage valves (direct-acting valves) are divided into 6 channels and 10 channels; two-stage valves (pilot control valves) are divided into 16, 25, 32... channels (the larger the number The larger the valve volume, the greater the flow capacity). [0003] The fluid switching control valve used for small flow is generally in the form of a single-stage...

AI Technical Summary

Problems solved by technology

For fluid control valves with medium and large flow rates, since the hydraulic force acting on the valve core is too large when the valve core is opened, it is still impossible to overcome the hydraulic force to push the valve core simply by increasing the volume of the electromagnetic drive device.

So the current technology is: use a small electromagnetic switch valve (usually 6-way through) as the pilot stage, control the pressure of the left and right chambers of the valve core, and realize the hydraulic power to push the valve core, which solves the problem of large flow down-changing However, this technology not only increases the volume of the switch valve, but also increases the cost. The superposition of the two valves also increases the complexity of the valve and reduces the reliability of the valve.

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