01/06/2026
A pneumatic wafer butterfly valve is an automated valve widely used in industrial fluid control systems. Its core function is to drive the butterfly plate to rotate 90° using compressed air, thereby achieving rapid opening/closing or flow regulation of the medium within the pipeline. This valve combines a "wafer-style" installation structure with a "pneumatic actuator" drive method, offering advantages such as a compact structure, lightweight design, low operating torque, fast response speed, and reliable sealing. It is particularly suitable for applications with limited space, frequent switching requirements, or the need for remote automated control.
Structurally, it consists of a valve body, butterfly plate, valve stem, sealing ring, and a pneumatic actuator mechanism. The valve body does not have its own flanges; instead, it is clamped directly between two pipeline flanges using long bolts, which saves installation space. The butterfly plate is disc-shaped and forms a sealing surface with the inner wall of the valve body,linked to the pneumatic actuator via the valve stem. The sealing rings are typically made of elastic materials such as EPDM, NBR, or PTFE, enabling bidirectional zero-leakage sealing. Some high-end models also feature a triple-offset metal hard-seal structure, making them capable of withstanding high temperatures, high pressures, and corrosive media.
Pneumatic actuators are categorized into two types: double-acting (air-to-open/air-to-close) and single-acting (spring return). They support 4-20mA signal input and can seamlessly integrate with control systems like PLCs and DCS for precise remote control. Additionally, most products are equipped with a manual override handwheel to ensure safe operation in the event of a power outage or air supply failure.
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