Differential pressure compensation valve with fast and stable main valve opening degree

Abstract

The invention provides a differential pressure compensation valve with a fast and stable main valve opening degree. The differential pressure compensation valve with the fast and stable main valve opening degree is used for realizing the compensation of various disturbance factors in the control of a large flow multi-way valve by the differential pressure compensation valve, with the help of the structural design of a valve element of a main valve, the pressure before and after the main valve is fast and stable, pressure fluctuation is reduced, and noise is reduced. The differential pressure compensation main valve and a differential pressure compensation pilot valve are included. The differential pressure compensation main valve comprises a main valve body and the valve element of the main valve. An oil inlet and an oil outlet are formed in the main valve body, the oil inlet communicates with an internal main valve cavity through a valve port, the valve element of the main valve is arranged in the main valve cavity, and the differential pressure compensation pilot valve comprises a pilot valve body and a valve element of the pilot valve. A pilot valve cavity is formed in the pilotvalve body, and the valve element of the pilot valve is arranged in the pilot valve cavity.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a differential pressure compensating valve with fast and stable main valve opening. Background technique [0002] As the core component of the hydraulic control system, the valve controls the supply and closure of high-pressure liquid, but the valve is usually a structure in which the valve core opens and closes to control the valve port switch to flow the liquid, and the valve core will inevitably lead to fluctuations in the liquid pressure during the opening process , especially when the liquid with small flow rate is controlled, the small opening of the valve core leads to more obvious pressure fluctuations; in addition, when multiple valves act in combination, the system flow flows to the low-load actuator, which has the problem of poor controllability. [0003] In the hydraulic control system of the multi-way valve, setting the pressure difference compensator to directly cont...

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Problems solved by technology

[0002] As the core component of the hydraulic control system, the valve controls the supply and closure of high-pressure liquid, but the valve is usually a structure in which the valve core opens and closes to control the valve port switch to flow the liquid, and the valve core will inevitably lead to fluctuations in the liquid pressure during the opening process , especially when the liquid with small flow is controlled, the small opening of the valve core leads to more obvious pressure fluctuations; in addition, when multiple valves act in combination, the system flow flows to the low-load actuator, which has the problem of poor controllability

[0003] In the hydraulic control system of the multi-way valve, setting the pressure difference compensator to directly control the pressure difference and flow of the multi-way valve can compensate the control stability of the multi-way valve to a certain extent, but the pressure difference compensator is affected by the spring force and hydraulic pressure. Due to the double influence of power, only when the difference between the two remains constant can the flow rate of the reversing valve in the flow control system be guaranteed not to be affected by pressure changes. Influenced by other disturbance factors, the control accuracy of the compensated pressure difference is low, resulting in low flow control accuracy of the multi-way valve. Reducing the influence of the disturbance factor of the pressure difference compensator is conducive to the stable control of the flow rate. At the same time, it is also necessary to Analyze the influence of the spool structure on the pressure fluctuation, so as to reduce the pressure fluctuation from the improvement of the spool structure

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