How a Proportional Control Valve Works?

An electric control valve controls the flow rate of fluid or gas independent of load and empowers the user to control it electronically. Nowadays, proportional flow control valves come in various types to control fluid flow in different types of systems. They are suitable for various pneumatic and hydraulic machinery or equipment.

Proportional Control Valve

Furthermore, It is one of the most cost-effective solutions for controlling the flow, defining a direction and keeping the pressure under control. Further, various types of fluids and gases are used at the industrial level and they have unique natures and characteristics. Because of this, it’s crucial to use the right type of valve that suits the system.


Having an expected outcome from an electric proportional control valve, it’s necessary to have the proper knowledge of their working. Read more to know about the working of a control valve. 

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Working of a Proportional Valve:

Proportional flow control valves in a circuit reduce the need for various components. They help to enhance the efficiency and accuracy of a fluid system. A control valve has the ability to vary the flow of the fluid according to the provided electrical signal. After receiving that signal, the valve performs the necessary changes in the passage of the fluid so that it can have the desired value of flow rate and pressure. So that the system can outperform.


A Flow Valve keeps the output directly proportional to the provided electrical signal. It can provide three types of output to the user such as direction, flow rate and pressure. The coils of the valves operate on DC voltage and this can vary. Resultantly, it will create a varying force that will move the spool. The remote controllability of proportional flow control valves makes them an ideal option for various industrial applications where it’s not suitable to go near the place of valve installation. 


A PLC device is commonly used for the operation of the valve because it sends a signal to the valve that tells the proportional needle valve what to do for maintaining the required flow. This control device provides an electrical signal to the driver of the valve and further, it sends a signal to the valve and the spool is shifted for creating a flow path so the fluid can flow at the desired flow rate. 

Typical Applications:

A flow control valve is good for various applications like blow molding, hydraulic systems or equipment, spraying, analytical and testing instruments and medical applications, where accuracy is the main key concern of the user. 


Here we have listed some common applications of proportional flow valves:


  • Burner/Flame Control.
  • Level Control.
  • Accurate Mixing of fluids or gases.
  • Temperature Control.
  • Maintaining the Flow Rate.
  • Keeping the Pressure Low.

Final Words:

The use of proportional flow control valves helps in decreasing waste by maintaining the required flow and stable pressure of the fluid. Providing a quick and accurate response allows them to improve the efficiency and the working of a system. 

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