Regulated Type Pneumatic Butterfly Valve

Pneumatic Butterfly Valves are categorized into single-acting and double-acting types based on their actuator mechanism. They differ significantly in terms of operation principle, structural characteristics, and application scenarios.

A single-acting actuator has only one air chamber and relies on a one-way air supply to open the valve, while a built-in spring ensures automatic closure when the air supply is cut off.

Working Principle:
When compressed air is supplied, the air pressure pushes the piston or actuator, driving the valve to open. Once the air supply is cut off, the built-in spring automatically resets the valve to the closed position.

Key Features:
• Simple Structure: Typically consists of a single valve seat and a spring return mechanism.
• Failsafe Function: In case of air supply failure, the spring ensures automatic closure for safety.
• Lower Air Consumption: Uses compressed air only in one direction, making it more energy-efficient.

A double-acting actuator controls flow in both directions and requires air supply in both directions to operate the valve.

Working Principle:
The actuator has two air chambers. Compressed air alternates between the chambers, driving the piston left or right to rotate the valve body in the desired direction, thus controlling the opening and closing of the valve.

Key Features:
• More Complex Structure: Typically has an integrated design with two valve seats at the inlet and outlet.
• No Automatic Reset: The valve’s position is entirely dependent on the air supply, without a spring return function.
• Higher Air Consumption: Requires compressed air in both directions, making it suitable for frequent operation scenarios.