A damping pilot valve sleeve control on-off valve

Abstract

The invention belongs to the field of fluid transmission and control, and in particular, relates to a damping pilot valve sleeve control switching valve. The damping pilot valve sleeve control switching valve comprises a valve body and a main valve element; driving devices are arranged at two ends of the valve body; an adjusting cavity is formed between the driving devices and the main valve element; an oil inlet channel communicating with the adjusting cavity and an oil outlet channel communicating with the adjusting cavity are arranged in the main valve element; a fixed damper is arranged inthe oil outlet channel; a pilot valve sleeve is arranged outside the main valve element; and through driving of the pilot valve sleeve, the hydraulic pressure of the adjusting cavity on one side is changed to form a hydraulic difference so as to shift the main valve element. The pilot control switching valve has the following advantages: (1) the main valve element is driven by hydraulic force, not directly driven by electromagnetism, so that the driving force is greatly increased; (2) the pilot valve sleeve is designed in the valve body to greatly reduce the size; and (3) the pilot valve sleeve is designed to control the pressure of control cavities at two ends of a main valve; and the flow needed by piloting is lower, so that the driving force for driving the pilot valve sleeve is lower,the size of an electromagnetic driving device is further reduced, and meanwhile, the purposes of energy conservation 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 damping pilot valve sleeve 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 switch valve plays the role of controlling the flow and switching the oil circuit; the electromagnetic switch valve is divided into a single-stage valve direct-acting valve and a two-stage valve pilot control valve according to the flow capacity. In the industry standard, the single-stage valve direct-acting valve is divided into 6 passages and 10 passages; the two-stage valve pilot control valve is divided into 16, 25, 32... The larger the passage number, the larger the valve volume, The flow capacity is also greater. [0003] The fluid switch 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, generally 6-way channel, as the pilot stage to control the pressure of the left and right chambers of the spool, and realize the use of hydraulic power to push the spool, thus solving the problem of reversing valves with large flow rates 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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