Pneumatic Concentric Resilient‑Seated Flanged Butterfly Valve

Pneumatic Concentric Resilient‑Seated Flanged Butterfly Valve is driven by a pneumatic actuator. It adopts a concentric disc structure, flanged end connections and a resilient soft seat. The valve body is equipped with integral flanges at both ends, which can be directly bolted to pipeline flanges for firm installation and convenient disassembly and maintenance. The disc and valve stem are arranged concentrically on the same axis, resulting in low operating torque. Reliable sealing is achieved when the disc compresses against the resilient seat.

Operating Principle of Pneumatic Resilient‑Seated Flanged Butterfly Valve：
Opening Stroke: Upon receiving an opening signal from the control system, compressed air enters the pneumatic actuator, which drives the valve stem to rotate and turns the disc gradually from the closed position. As the disc rotates, the flow‑through area of the pipeline increases progressively. When the disc turns to a position substantially parallel to the pipeline flow path, the valve reaches full‑open status, allowing smooth media passage with low pressure loss.

Closing Stroke: When the control system sends a closing signal, the pneumatic actuator operates in reverse and rotates the disc to the closed position. The disc turns to be approximately perpendicular to the pipeline flow path and compresses the resilient seat. The soft‑seated seat undergoes certain elastic deformation and makes tight contact with the disc sealing surface. Reliable shut‑off is realized by sealing specific pressure to block media passage.

Automatic Control: Double‑acting or spring‑return single‑acting pneumatic actuators are selectable according to service conditions. Solenoid valves control compressed air supply to realize automatic valve opening and closing. Limit switches provide feedback of valve open‑close status. When equipped with a valve positioner, the disc opening can be adjusted based on control signals to achieve flow control within a certain range.