A pilot control switch valve

Abstract

The invention belongs to the field of fluid transmission and control, and specifically relates to a pilot control switch valve, which includes a valve body and a main valve core. A drive device is provided at both ends of the valve body. An adjustment chamber is formed, two separate slots are arranged at both ends of the main valve core, and two pilot valve cores are respectively arranged in the two slots, and the adjustment chamber is connected to the high-pressure oil inlet or The low pressure oil outlet creates hydraulic force to move the main spool. The pilot control switch valve of the present invention has the following advantages: 1. The main valve core is driven by hydraulic pressure instead of direct electromagnetic drive, and the driving force is greatly increased; 2. The pilot valve core is designed inside the main valve core, which greatly reduces Small size; 3. The pilot spool is designed to control the pressure of the control chamber at both ends of the main valve. The flow required for pilot control is very small, so the driving force for driving the pilot spool can be very small, further reducing the volume of the electromagnetic drive device. At the same time to achieve the purpose of energy saving and emission reduction.

Description

technical field [0001] The invention belongs to the field of fluid transmission and control, and in particular relates to a pilot control switch 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 direct-acti...

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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