Principle and knowledge of pneumatic diaphragm control valves.
I. Introduction. Pneumatic diaphragm control valve is a kind of fluid conditioning equipment that is widely used in industrial process control. Its unique design and operating principle make it excellent regulation performance in a variety of fluid systems. This article will introduce the principle, structure, characteristics and application of pneumatic diaphragm control valve in detail.
Second, the principle of pneumatic membrane control valve.
The pneumatic diaphragm control valve is mainly composed of two parts: actuator and adjusting mechanism. The actuator is the power source of the valve, which is usually composed of components such as a gas-liquid converter, cylinder, piston and diaphragm. The regulating mechanism is responsible for controlling the opening of the valve, including components such as the seat, spool, stem and transmission.
When compressed air enters the cylinder through the gas-liquid converter, the piston is pushed by air pressure and moves. The movement of the piston is transmitted to the stem through the diaphragm, which drives the spool to rotate or move up and down in the seat, changing the opening of the valve. The opening of the valve is proportional to the pressure of the compressed air, so by controlling the pressure of the compressed air, it is possible to precisely regulate the fluid flow.
3. The structure of the pneumatic membrane regulating valve.
The structure of the pneumatic diaphragm control valve is relatively simple, mainly including valve body, valve core, valve seat, diaphragm, cylinder, piston and other components. The valve body is usually made by casting or forging process, which has good sealing and corrosion resistance. The spool and seat are the key components of the valve, and their material and machining accuracy directly affect the sealing and adjustment performance of the valve. The diaphragm is responsible for translating the linear motion of the piston into the rotation or linear motion of the stem. The cylinder and piston form the actuator and are responsible for driving the movement of the valve core.
Fourth, the characteristics of pneumatic diaphragm control valve.
Rapid action: Due to the pneumatic drive, the pneumatic diaphragm control valve has the characteristics of fast response and sensitive action.
Precise regulation: Precise regulation of the fluid flow can be achieved by precisely controlling the pressure of the compressed air.
Simple structure: The structure of the pneumatic diaphragm control valve is relatively simple, and it is easy to maintain and replace parts.
Safe and reliable: The valve has good sealing performance and small leakage, and is suitable for various harsh environments and use scenarios.
Energy saving and environmental protection: due to the pneumatic drive, no electric drive is required, so it has the advantages of energy saving and environmental protection.
5. Application of pneumatic diaphragm control valve.
Pneumatic diaphragm control valves are widely used in various industrial process control, such as chemical, petroleum, electric power, metallurgy, pharmaceutical and other industries. In these areas, pneumatic diaphragm control valves are mainly used to regulate parameters such as flow, pressure and temperature of fluids to meet the needs of the production process. At the same time, pneumatic diaphragm control valves are also widely used in air conditioning, ventilation and heating systems to control air flow and temperature.
VI. Conclusions. To sum up, the pneumatic diaphragm control valve is a fluid regulation device with excellent performance and simple structure. Its unique working principle and structural characteristics make it have a wide range of application prospects in various industrial process control. With the continuous development of industrial technology, pneumatic diaphragm control valves will continue to play an important role in the field of fluid control.