Why Use a Proportional Valve?

Why Use a Proportional Valve?

Proportional valves provide a change in output pressure or flow in the same ratio as the change in the input; for example, if the input is doubled, the output will also be doubled. This article outlines the advantages and applications of these valves.

What are its main characteristics?

Proportional valves are suitable for applications where the output pressure changes, and can be either gradual or continuous. Stepped output pressure means that the pressure remains at one value before the pressure increases to another value. Continuous output pressure means that the pressure continues to increase at a set rate.

Proportional valves can be connected to each other, for example, from one output to be used as an input to another. Many are programmable with on-board diagnostics, making them very suitable for Industry 4.0 system design.

They are reliable, cost-effective (especially pilot operation), quick response and consistent control.

Proportional valve

What are the benefits?

Proportional valves can help reduce the number of cycles by quickly achieving stable pressure. They have a fast and accurate response, which will increase efficiency. They also provide repeatable control and pressure output, giving the expected response every time.

What are the main considerations when choosing?

There are some basic parameters to consider. First, what is controlled? Pressure, flow or other characteristics. What input and output pressure ranges are required, and what is the range of flow rates? What is the operating temperature that the proportional valve may experience? Are there other environmental considerations, such as wet and dirty applications.

It is important to consider whether this process is a static, step-by-step, or dynamic one. This may well determine the required response time and hysteresis performance.

Cost may be a consideration. As mentioned earlier, air-pilot operated valves are particularly cost-effective.

What are the typical applications?

Proportional valves are suitable for analysis and testing instruments, process applications such as tension, spraying and blow molding. They have also been found in medical and foundry applications. However, they can also be used in many other applications.

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