A high-frequency-response electro-hydraulic servo valve dynamic characteristic optimization structure and a control method thereof

By using a voice coil motor to drive the axial displacement of the valve core and a unique piston structure, combined with a piezoelectric ceramic sensor and a cleaning auger, the control accuracy and safety issues of traditional electro-hydraulic servo valves at high frequencies are solved. This enables rapid oil circuit switching and impurity removal, improving the system's reliability and maintenance efficiency.

CN122129456APending Publication Date: 2026-06-02LISHUI GATE VALVE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LISHUI GATE VALVE CO LTD
Filing Date
2026-03-16
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Traditional electro-hydraulic servo valves suffer from signal delay and noise interference in high-frequency response designs, leading to communication interference and affecting system performance. Existing technologies struggle to meet high-frequency response requirements, and impurities in the hydraulic oil cause reduced control accuracy and safety hazards.

Method used

The valve core is directly driven by a voice coil motor for axial displacement. The valve core is slidably connected to the irregularly shaped piston and the irregularly shaped hole at the end of the valve core. An integrated piezoelectric ceramic sensor senses the reaction force in real time. The valve core is rotated and sealed by driving the motor. A filter cartridge and a cleaning auger are installed in the oil distribution channel to clean impurities regularly. Impurities are discharged by the flow of hydraulic oil.

Benefits of technology

It enables rapid switching and emergency sealing of the oil circuit, improves the safety and control flexibility of the system, significantly extends the fault-free operation time of the servo valve, and reduces maintenance costs.

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Abstract

This invention relates to the field of electro-hydraulic servo valve technology, and discloses an optimized structure for the dynamic characteristics of a high-frequency response electro-hydraulic servo valve. The structure includes a valve body, a valve core sleeve internally connected to the valve body, a valve core body inside the valve core sleeve, side plates on both sides of the valve body, a sealing cap at the top of the valve body, a wiring terminal on one side of the sealing cap, an original drive assembly internally connected to the sealing cap, a motorized assembly on one side of each side plate, and a mounting ring on another side of each side plate. This invention achieves multi-functional integration without significantly increasing the overall size of the valve body by compactly arranging the motorized assembly, drive assembly, cleaning assembly, and oil storage and pressurization assembly within the valve body and side plates, and by rationally designing each oil circuit and control channel. This facilitates installation and widespread application.
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