Langjie proportional valveAs the "control center" of the hydraulic system, its core advantage lies in the precise command of electrical signals, which is seamlessly converted into the flow or pressure output of hydraulic oil through the "electric mechanical hydraulic" three-stage conversion, achieving stepless speed regulation and force control of the actuator. This conversion process is not simply energy transfer, but relies on the collaborative linkage of various modules to build a balance between response speed and control accuracy, providing reliable hydraulic control support for engineering machinery, industrial automation and other scenarios.

The first stage of "electrical signal decoding" is the source of conversion instructions, with the core being the conversion of control signals into drivable electromagnetic force. The dedicated proportional amplifier installed on the Langjie proportional valve first receives an analog electrical signal (usually a 4-20mA current signal or a 0-10V voltage signal) from the PLC or controller, and filters out high-frequency interference through a signal conditioning circuit to ensure the stability of the command signal. Subsequently, the amplifier outputs a proportional driving current to the proportional electromagnet based on the signal amplitude. The electromagnetic force generated by the electromagnet coil is strictly positively correlated with the input current, for example, 20mA current corresponds to the rated electromagnetic force, achieving a linear mapping of "electrical signal strength → electromagnetic force magnitude", laying a precise foundation for subsequent conversion.

The second stage "mechanical force transmission" is the core bridge of conversion, responsible for the precise conversion of electromagnetic force to valve core displacement.Langjie proportional valveAdopting the design of a moving iron or moving coil proportional electromagnet, when electromagnetic force acts on the armature, the armature overcomes the pre tension force of the reset spring and produces linear displacement, and the displacement is proportional to the difference in electromagnetic force. To eliminate mechanical hysteresis, the valve core and armature are rigidly connected and equipped with displacement feedback sensors (such as differential transformer LVDT) to collect real-time valve core position data and feed it back to the proportional amplifier, forming a closed-loop control. If the displacement of the valve core deviates from the instruction value, the amplifier immediately adjusts the driving current to control the displacement error within ± 0.01mm, ensuring the error free transmission of "electromagnetic force → valve core displacement".

The third stage 'hydraulic energy output' is the ultimate goal of conversion, achieving precise control of valve core displacement to hydraulic parameters. The valve sleeve and valve core of the Langjie proportional valve adopt a precision grinding mating pair, with a clearance controlled at 5-10 μ m. When the valve core moves along the axis, it will change the flow area of the valve port. According to the principles of hydraulic fluid mechanics, the flow area and flow rate have a specific functional relationship. By designing special valve port shapes (such as equal percentage and linear characteristics), the flow rate or pressure can be linearly proportional to the displacement of the valve core. For example, when the displacement of the valve core reaches 50%, the overcurrent area of the valve port synchronously opens by 50%, and the output flow rate stabilizes at 50% of the rated value, completing the proportional conversion of "valve core displacement → hydraulic parameters".

The collaborative optimization of third-order conversion is the technical highlight of Langjie proportional valve. To improve response speed, it adopts a combination of low hysteresis electromagnet and high stiffness reset spring, which shortens the response time from electrical signal input to hydraulic output to within 10ms; For high-pressure working conditions (up to 31.5MPa), the valve core is made of high-strength alloy material, combined with a labyrinth seal structure, which not only ensures pressure resistance but also reduces the impact of hydraulic clamping force on displacement accuracy. In addition, the built-in temperature compensation algorithm of the proportional amplifier can correct the force deviation caused by the temperature drift of the electromagnet, ensuring that the linearity error of the third-order conversion is always below 1% in the environment of -20 ℃ to 80 ℃.

　　Langjie proportional valveThe essence of the "electric mechanical hydraulic" third-order conversion is to achieve distortion free transmission of various forms of energy through closed-loop control and precision design. From precise decoding of electrical signals to closed-loop correction of mechanical displacement, to linear output of hydraulic parameters, the technical optimization of each link revolves around the core requirements of "precision, speed, and stability", making proportional valves a key hub connecting electrical control and hydraulic execution, providing a solid guarantee for the intelligent control of hydraulic systems.