What is a proportional valve？

In the industrial, engineering, manufacturing and scientific industries, valves serve multiple purposes. Their main purpose, however, is to control a specific medium flow through a system. Typically, valves may be used to start, stop, or throttle the flow to ensure safe and efficient operation of the process. Valves come in many different types and arguably the most dependable, cost-effective, and consistent control at relatively low flow rates are proportional control valves.

A proportional valve is a valve that produces an output that is proportional to an electronically controlled input. How it works can be a bit technical. It starts with a source that provides an electrical current. This source can be a machine operated potentiometer, a preset potentiometer, a joystick, or a PLC. Once the electrical current is provided, its input will regulate an electrical signal to the valve’s solenoid coil. The solenoid coil will then convert the electrical input into a mechanical force. This mechanical force will allow for movement by the armature, which in turn will input a force to the valve spool in a flow control, pressure reducing, or directional control fashion.
A proportional valve is a control valve that can continuously and proportionally control the flow, pressure and direction in a hydraulic system or pneumatic system according to the size of the input electrical signal.

In industrial automation production, the accuracy and response speed of proportional valves are crucial. It can achieve precise control of the movement speed and position of the actuator to meet the requirements of various complex processes.

For example, in the hydraulic system of a CNC machine tool, a proportional valve can accurately control the feed speed of the tool to ensure machining accuracy.

In the field of automobile manufacturing, proportional valves are used to adjust the pressure of the brake system to ensure stable and reliable braking performance of the vehicle.

In plastic molding machinery, proportional valves can accurately control the pressure and flow during injection molding and extrusion to improve product quality.
In short, proportional valves play an indispensable role in many industrial fields with their excellent control performance, and play an important role in improving production efficiency and product quality.