Introduction of Pneumatic Butterfly Valves

The pneumatic butterfly valve operates by rotating a circular butterfly plate to open and close the valve. Primarily used for on-off control, it can also be adapted for throttling applications as a segment valve. Increasingly, the disc valve finds utility in low-pressure, large-diameter pipelines.

The butterfly valve offers several notable advantages, including its simple structure, compact size, lightweight construction, and cost-effectiveness. Particularly noteworthy are the characteristics of the pneumatic disc valve, which find significant application in high-altitude tunnels. When controlled by two five-way solenoid valves, this valve allows for convenient operation and precise adjustment of the flow medium. With minimal fluid resistance, the large-diameter pneumatic disc valve ensures efficient fluid flow when fully open, thanks to its ample effective flow area and rapid opening and closing mechanism achieved through a 90-degree disc rotation. Moreover, the balanced force exerted on both sides of the disc by the rotating shaft results in minimal torque during opening and closing, enabling effective sealing even at low pressures. Butterfly valves utilize various sealing materials, including butadiene rubber, fluorine rubber, and edible rubber, or are lined with tetrafluoride for enhanced sealing performance. Furthermore, the hard seal butterfly valve, featuring a hard and soft laminated metal sheet, combines the advantages of metal hard seals and elastic seals, ensuring excellent sealing performance, even in low-temperature conditions.

The analysis of the working principle of the butterfly valve structures applicable to environmental 

An examination of the operational principles of butterfly valve structures and their environmental applicability reveals their versatile design and functionality. Positioned within the diameter direction of the pipe, the butterfly valve's disc rotates within the cylindrical channel of the valve body, with its rotation angle typically ranging from 0 to 90 degrees. Achieving full openness at a 90-degree rotation, this valve type boasts a simplistic design, compact size, and lightweight construction, comprising only a handful of components. Its swift operation, requiring just a 90° rotation for quick opening and closing, ensures ease of use.

Moreover, electrically operated butterfly valves offer precise fluid control, particularly when fully open, where the only resistance encountered by the flowing medium is the thickness of the butterfly plate. Consequently, the pressure drop generated by the valve remains minimal, facilitating superior flow control. Butterfly valves are available in two sealing types: flexible seal and metal seal. Flexible seal valves feature seal rings that can be positioned on the body or affixed to the disc circumference, while metal seal variants, although typically longer than their elastic seal counterparts, provide greater adaptability to higher working temperatures.

However, it's important to note that achieving a complete seal with metal seals can be challenging. Despite this, metal seals offer advantages in environments with elevated temperatures, addressing the temperature limitations inherent in elastic seals. When selecting a butterfly valve for flow control purposes, ensuring the appropriate size and type of valve is paramount. The structural principles of butterfly valves are particularly conducive to the production of large-diameter valves, making them widely utilized across various industries, including petroleum, gas, chemical, water treatment, and thermal power station cooling water systems.