Pneumatic control valves use compressed gas as a power source and a cylinder as an actuator. They are driven by accessories such as valve positioners, converters, solenoid valves, position-holding valves, air tanks, and gas filters to achieve on/off or proportional regulation. They receive control signals from industrial automation control systems to regulate various process parameters of pipeline media, including flow rate, pressure, temperature, and level. The characteristics of pneumatic control valves are simple control, rapid response, and inherent safety, requiring no additional explosion-proof measures.
Working Principle
The pneumatic control valve receives an electrical or pneumatic signal from the controller. This signal is converted into a corresponding pneumatic pressure signal by a converter and input to the actuator.
The actuator generates a corresponding thrust or displacement based on the magnitude of the pneumatic pressure signal, causing the valve core of the control valve to move. This changes the opening between the valve core and the valve seat, thereby regulating parameters such as fluid flow, pressure, or temperature.
Features
High Control Precision: Capable of precisely regulating parameters such as flow rate, meeting the control requirements of various complex processes.
Rapid Response: Fast response speed, enabling the valve to open and close quickly, rapidly adjusting process parameters.
Simple and Reliable Structure: Pneumatically driven, eliminating the need for complex mechanical transmission devices, resulting in a relatively simple structure, low failure rate, and convenient maintenance.
Intrinsically Safe: Powered by compressed air, eliminating the safety hazards of electrical sparks, making it suitable for flammable and explosive environments.
Application Areas
Petrochemical Industry: Used in petroleum refining and chemical production processes for controlling the flow, pressure, and temperature of various fluid media, such as crude oil transportation and material proportioning in chemical product manufacturing. Power Industry: Used in boiler feedwater regulation, steam flow regulation, and cooling water flow control in thermal power plants to ensure the safe and stable operation of generator units.
Metallurgical Industry: Precisely controls the flow rates of gases such as coal gas, air, and oxygen during steelmaking to ensure the smooth operation of ironmaking and steelmaking processes.
Pharmaceutical Industry: Used for fluid transport and flow control in pharmaceutical production to ensure the stability and consistency of drug quality.