Double-Flange Butterfly Valve
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Double-Flange Butterfly Valve
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Double-Flange Butterfly Valve
Detailed introduction:
This valve is a pneumatic lug-type butterfly valve, utilizing a pneumatic actuator to control the opening and closing of the valve. The pneumatic actuator converts pneumatic energy—driven by compressed air—into mechanical energy, which in turn drives the valve to open, close, or adjust its degree of opening. Below is a detailed explanation of its operating principle from three aspects: the air intake process, energy conversion, and control mechanism.
Intake Process
1. The pneumatic actuator receives compressed air from the air supply, which is regulated by a valve before entering devices such as cylinders or air motors.
2. For a double-acting actuator, the air supply enters the cylinder from different air ports, pushing the piston to move in opposite directions.
3. For a single-acting actuator, the air supply enters from one air port, pushing the piston to compress the spring; when the air supply is cut off, the spring rebounds.
Energy Conversion
1. The cylinder generates linear motion by using compressed air to push the piston, thereby producing torque as output.
2. An air motor uses compressed air to drive the rotor, generating rotational motion and outputting torque.
3. This energy conversion method enables pneumatic actuators to adapt to various operational requirements, such as linear or rotary motion.
Control Method
1. The pneumatic actuator receives signals from the control unit, such as a 4-20mA DC signal.
2. The valve positioner controls the stem displacement of the control valve by adjusting the output air pressure according to the input signal.
3. The magnitude of the control signal determines the valve opening, thereby enabling precise control of the production process.
Pneumatic actuators are classified into two types—single-action and double-action—depending on their structure and operating principles. Single-action actuators feature a spring-return mechanism, while double-action actuators do not include such a spring. In terms of failure modes, pneumatic actuators can be configured to either Fail Open (the valve opens in case of a failure), Fail Close (the valve closes during a failure), or Fail Location (the valve remains in its current position when a fault occurs). These characteristics make pneumatic actuators highly versatile and widely used in the field of industrial automation.
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