Pneumatic control valve can be divided into two types: straight stroke arrangement and angular stroke according to its process. According to its structural characteristics, it can be divided into direct single valve valve, direct double seat valve, high pressure valve, angle valve, sleeve valve, pneumatic butterfly valve, butterfly valve, Axial rotary valve, etc. Among them, the direct valve is more common, the leakage of the single valve valve is small, but the pressure difference between the front and rear of the valve should not be very large, and the double seat valve is just the opposite.
The pneumatic control valve also has the function of common fault calibration. In the selection process, the air-opening or air-closing type can be selected according to the situation. In the event of a problem with the pneumatic valve, the valve can be automatically repaired to fully open or fully closed according to the safety of the pipeline. This is also not possible with general electric valves. In terms of price, pneumatic control valves are also more cost-effective than electric valves of the same type.
Changchun City Electric Butterfly Valve Market Sales of Pneumatic Control Valves The key to the advantages of pneumatic control valves is that the total switching speed of the power supply of the pneumatic control valve can be adjusted, the structure is simple, and it is easy to maintain. , It is more reliable than electric valve in some places where explosion-proof type is required. Because there are no electrical components in the composition of the pneumatic control valve, even if common problems are caused when transporting flammable and explosive chemicals, it is not easy to cause sparks due to electrical components and cause safety hazards to the load.
The limit switch (returner) travel switch reflects the two extreme parts of the valve power switch, and sends out a signal at the same time, the main control room can rely on this signal, and it is easy to take effective countermeasures against the button situation of the valve. Pneumatic control valve; hydraulic control system; regulation; pneumatic control valve is a kind of valve that can realize remote control and precise control of valve opening by using compressed gas as a power device. Pneumatic control valves are easy to maintain and fast to open and close. In the event of accidental loss of power, the valve can be placed in an invalid safety position. At the same time, it is more suitable for explosion-proof sites, so it is used in petrochemical, thermal power plants, nuclear power plants, etc. industry.
The flow characteristic of the regulating valve is that under the premise that the pressure difference between the two ends of the valve remains stable, the relative flow of the material flowing through the regulating valve is related to its opening degree. The regulating valve is used to regulate the flow, pressure and level of the substance. According to the adjustment position data signal, the opening degree of the system valve is automatically controlled, and then the material flow, pressure and water level are adjusted. The regulating valve is divided into electric regulating valve, pneumatic regulating valve and hydraulic control valve regulating valve. The key of the product manual introduces two kinds of electric control valve and pneumatic control valve in detail.
With the development of China's high-tech capabilities, my country's petrochemical manufacturing automation technology has also achieved rapid marketing promotion, which can complete the accurate control of flow, pressure, liquid level and temperature. In chemical plant control systems, regulating valves It belongs to a major electric actuator. Its model specification and assembly quality have a crucial impact on the adjustment quality of the adjustment control circuit. If the selection and use of the control valve are unreasonable, it will seriously endanger the service life of the control valve. In severe cases, it may even lead to a parking safety accident. The following is a further analysis of the selection and use of pneumatic control valves in the entire process of chemical plant automatic control systems.
Imported pneumatic control valve is widely used in automatic adjustment of material flow, pressure and ambient temperature. The adjustment method of the imported pneumatic control valve is to be equipped with a flowmeter when the flow is adjusted, and the substance is accurately adjusted according to the data signal obtained by the flowmeter; when the flow is adjusted, the pressure is accurately adjusted according to the data signal transmitted by the pressure intelligent transmitter. Adjust the pressure; automatically adjust the ambient temperature according to the data signal from the temperature sensor. .
Also known as electric control valve, pressure control valve, single valve control valve, pneumatic control valve, sleeve specification control valve, double seat control valve, three-way control valve, ambient temperature control valve, exhaust air volume control valve, self-operated type Control valve, fire safety control valve, separation control valve, manual control valve, cage control valve, micro-pressure control valve, fine and small control valve, angle control valve, tubular control valve, multi-leaf control valve, gas pressure Control valve, direct control valve, electronic control valve, waste control valve, sealing control valve, steam control valve, water supply and drainage control valve, temperature control control valve, explosion-proof control valve, automatic control valve, stainless steel plate control valve , Plastic-lined composite pipe regulating valve, locking regulating valve, constant flow regulating valve, flap regulating valve, copper regulating valve, lifting system regulating valve, unilateral regulating valve, metal bellows regulating valve, heating furnace water supply and drainage regulating valve, computer Interface type regulating valve, etc.
Pneumatic control valves are divided into two types: air-open type and air-close type. The air-opening type regulating valve is when the gas pressure on the top of the membrane head increases, the valve is in the position of increasing the opening degree, and when the standard air pressure limit is entered, the valve is in the open state. On the contrary, when the gas pressure is reduced, the valve is in the closed position, and when no gas is input, the valve is fully closed.
The regulating valve is used to regulate the flow, pressure and level of the substance. According to the adjustment position data signal, the opening degree of the system valve is automatically controlled, and then the material flow, pressure and water level are adjusted. The regulating valve is divided into electric regulating valve, pneumatic regulating valve and hydraulic control valve regulating valve. The key of the product manual introduces two kinds of electric control valve and pneumatic control valve in detail. The regulating valve is adjusted by electric or pneumatic actuators and
