The principle and application of hydraulic proportional valve

Hydraulic proportional valve, as an innovative hydraulic control device, achieves remote, continuous, and proportional control of oil flow pressure, flow rate, or direction by replacing the traditional control part with a proportional solenoid. This control method is highly dependent on the input electrical signal, and proportional valves usually have pressure compensation function to ensure that the output pressure and flow remain stable when the load changes.

1. Principle and composition Working principle of hydraulic proportional valve Electro hydraulic proportional valve, abbreviated as proportional valve, works based on the input of electrical signals to achieve remote, continuous, and proportional control of hydraulic system pressure and flow. Unlike traditional hydraulic valves, proportional valves replace the traditional control part with proportional electromagnets, achieving more flexible and precise control. In the working process of the equipment mechanism, if real-time adjustment or continuous control of the pressure and flow parameters of the hydraulic system is required, such as requiring the worktable to achieve continuous feed according to slow, fast, and slow speed changes during feed, or accurately simulating an optimal control curve to achieve pressure control, then ordinary hydraulic valves cannot meet these requirements. However, electro-hydraulic proportional valves can easily address these challenges and achieve effective control over hydraulic systems.

2. Structure of electro-hydraulic proportional valve Electro hydraulic proportional valve is a type of valve that can continuously and proportionally control the direction, flow rate, and pressure of hydraulic system based on input electrical signals. Its core components include an electric mechanical proportional conversion device and a hydraulic control valve body. The former is responsible for continuously and proportionally converting electrical signals into mechanical forces and displacement outputs, while the latter receives these mechanical forces and displacements and continuously and proportionally outputs the required pressure and flow based on them.

3. Work Process Torque motor and valve core control Working principle: When there is no electrical signal input, the armature in the torque motor remains in a neutral position, balanced with the magnetic force of the permanent magnet. Once current is introduced into the coil, the armature will produce a clockwise or counterclockwise deflection action according to the polarity of the input control signal. This deflection action causes pressure changes by rotating the two nozzles through the frame, pushing the valve core to move and achieve linear flow output. At the same time, the feedback rod and mechanical spring assembly will generate a force opposite to the torque motor force, ensuring that the valve core can perform repeatable proportional motion according to the electrical signal.

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