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.
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Pneumatic Control Valve Technical parameters
Design and manufacturing:GB/T 12235, ASME B16.34, IEC 60534
The structural length: GB/T 12221, ASME B16.10
Connection forms:HG/T 20592-20605, GB/T 9112-9124, ASME B16.5
Inspection and test:GB/T 13927, API 598, IEC 60534-4
Caliber:1/2″ ~ 24″ (DN15 ~ DN600)
Pressure temporature level:ASME B16.34, GB/T 12224
Drive mode: Pneumatic Actuated
Pressure:PN1.6 MPa ~ PN40 MPa Class 150 ~ Class 2500
Pneumatic Control Valve Features
High control precision: Capable of precisely adjusting parameters such as flow rate to meet the control requirements of various complex processes.
Rapid action: Fast response speed, enabling valve opening and closing actions to be completed in a short time, allowing for rapid adjustment of process parameters.
Simple and reliable structure: Utilizing pneumatic drive, it eliminates 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, it eliminates the safety hazards of electrical sparks, making it suitable for flammable and explosive environments.
Pneumatic Control Valve Installation Principles
(1) The pneumatic control valve should be installed at a certain height from the ground, with sufficient space above and below for easy disassembly and repair. For control valves equipped with pneumatic valve positioners and handwheels, convenient operation, observation, and adjustment must be ensured.
(2) The control valve should be installed on a horizontal pipeline, vertically aligned with the pipeline. Generally, it should be supported below to ensure stability and reliability. In special cases where the control valve needs to be installed horizontally on a vertical pipeline, it should also be supported (except for small-diameter control valves). During installation, avoid applying additional stress to the control valve.
(3) The operating environment temperature of the control valve should be between -30°C and +60°C, and the relative humidity should not exceed 95%.
(4) There should be straight pipe sections before and after the control valve, with a length not less than 10 times the pipeline diameter (10D), to avoid the straight pipe section being too short and affecting the flow characteristics.
(5) When the diameter of the control valve is different from that of the process pipeline, a reducer should be used for connection. When installing small-diameter control valves, threaded connections can be used. The fluid direction arrow on the valve body should be consistent with the fluid direction.
(6) A bypass pipeline should be installed. This is to facilitate switching or manual operation, allowing maintenance of the control valve without stopping the machine.
(7) Before installing the control valve, thoroughly remove foreign objects from the pipeline, such as dirt and welding slag.
Pneumatic Control Valve Application Areas
- Petrochemical Industry: Used for flow, pressure, and temperature control of various fluid media in petroleum refining and chemical production processes, such as crude oil transportation and material proportioning in chemical product manufacturing.
- Power Industry: Used for 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: Used for precise flow control of gases such as coal gas, air, and oxygen in steel smelting processes to ensure the smooth operation of ironmaking and steelmaking processes.
- Pharmaceutical Industry: Used for fluid transportation and flow control in pharmaceutical production processes to ensure the stability and consistency of drug quality.
Pneumatic Control Valve factory
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