Pneumatic butterfly valve working principle

Pneumatic disc valves operate by rotating a circular disc within the valve body, making them primarily suitable for on/off control. However, they can also be designed to function as flow regulators or multi-step valves. These valves are increasingly being used in low-pressure pipelines with medium and large diameters due to their efficiency and reliability.

One of the main benefits of disc valves is their simple design, compact size, lightweight, and cost-effectiveness. This is especially true for pneumatic versions, which are often installed in hard-to-reach areas like high-altitude tunnels. They can be easily controlled using a two-position five-way solenoid valve, offering quick and convenient operation. The fluid resistance is minimal, and when fully open, large and medium-sized pneumatic disc valves allow for a significant flow area. Opening and closing requires only a 90-degree rotation, making the process efficient and less labor-intensive. Due to the balanced force on both sides of the shaft, the torque required for operation is low, resulting in excellent sealing performance under low pressure.

The sealing materials used in disc valves include nitrile rubber, fluororubber, food-grade rubber, and PTFE lining. These materials ensure strong sealing properties. In particular, hard-seal disc valves combine a metal sheet with an elastic seal, offering the advantages of both rigid and flexible sealing. This makes them ideal for low-temperature applications where reliable sealing is essential.

The working principle of butterfly valves involves a disc that rotates within the pipe’s diameter. The disc rotates around an axis inside the valve body, with an angle ranging from 0° to 90°. When it reaches 90°, the valve is fully open. This mechanism allows for fast and smooth operation, making butterfly valves a popular choice in various industries.

Butterfly valves are known for their simple structure, small footprint, and lightweight design, consisting of just a few components. They can be opened or closed in just 90 degrees, making them easy to operate. Electrically actuated models offer excellent flow control characteristics. When fully open, the disc acts as the only resistance, leading to minimal pressure drop and better flow performance.

There are two main types of sealing: spring-loaded and metal seals. Elastomeric seals are typically mounted on the valve body or attached to the edge of the disc. Metal-sealed valves tend to last longer but may not provide a perfect seal. They are suitable for high-temperature environments, whereas elastomeric seals have temperature limitations.

When selecting a butterfly valve for flow control, choosing the right size and type is crucial. The structural design of butterfly valves makes them ideal for large-diameter applications. They are widely used in industries such as oil and gas, chemical processing, water treatment, and even in cooling systems of thermal power plants.

Available types include Hard Seal Butterfly Valves, Wafer Type Hard Seal Butterfly Valves, Flange Hard Seal Butterfly Valves, Soft and Hard Seal Butterfly Valves, Manual Butterfly Valves, Pneumatic Butterfly Valves, Electric Butterfly Valves, Ventilation Butterfly Valves, Signal Butterfly Valves, Japanese Standard Butterfly Valves, American Standard Butterfly Valves, Gate Valves, Globe Valves, and Check Valves.