Pneumatic valve manufacturers: the principle and characteristics of pneumatic control valves
Release time:
2024-10-30 18:09
Pneumatic valve manufacturersPneumatic control valve is one of the industrial process control instruments widely used in petroleum, chemical, electric power, metallurgy and other industrial enterprises. In chemical production, regulating valve is essential in the regulating system. It is an important part of industrial automation systems, such as the hands and feet of production process automation. Pneumatic control valve to compressed air as the power source, to the cylinder as the actuator, with the help of electric valve positioner, converter, solenoid valve, position maintaining valve and other accessories to drive the valve, to achieve on-off or proportional adjustment, to accept the control signal of industrial automation control system, to complete the pipeline medium flow, pressure, temperature and other process parameters. Pneumatic control valves are characterized by simple control, rapid response, and no explosion-proof measures are required.
Pneumatic valve manufacturers believe that pneumatic control valves are usually composed of pneumatic actuators and control valves, which are connected to each other, installed and debugged. Pneumatic actuators can be divided into single-acting actuators and double-acting actuators. Single-acting actuators have return springs, but double-acting actuators do not. Among them, the single-acting actuator can automatically return to the opening or closing state set by the valve when it loses its origin or suddenly fails. Pneumatic control valve according to the role of the form is divided into normally open and normally closed two. Pneumatic control valve is usually through the positive and negative action of the actuator and the valve structure of the different assembly methods to open or close.
Pneumatic valve manufacturers believe that the open type (normally closed) refers to when the air pressure on the membrane head increases, the valve moves in the direction of increasing opening, and when the upper limit of the input air pressure is reached, the valve is fully open. On the contrary, when the air pressure decreases, the valve moves to the closing direction, and when there is no air input, the valve is completely closed. Usually, we call the pneumatic control valve for the fault shut-off valve.
The closed (normally open) direction of action is just the opposite of the open. When the air pressure increases, the valve moves in the closing direction; when the air pressure decreases or does not exist, the valve will be opened or fully opened. Usually, we call the airtight valve for the fault open valve.
Pneumatic valve manufacturers consider the choice of gas switch according to the safety of process production. When the gas supply is cut off, whether the regulating valve is in the closed position or the open position is safe. For the combustion control of the heating furnace, the regulating valve is installed on the gas pipe to control the supply of fuel according to the temperature of the furnace or the temperature of the heated material at the outlet of the heating furnace. At this time, it is safer to choose a pneumatic valve, because once the gas supply is stopped, the valve is closed more appropriate than the valve is fully opened.
Pneumatic valve manufacturersIt is believed that if the air supply is interrupted and the fuel valve is fully opened, overheating will be dangerous. Another example is a heat exchange device cooled by cooling water. The thermal material is cooled by heat exchange with cooling water in a heat exchanger. The regulating valve is installed on the cooling water pipe, and the temperature of the material after heat exchange is used to control the amount of cooling water. When the gas supply is interrupted, it is safer for the regulating valve to be in the open position, and it is advisable to choose the airtight (FO) regulating valve.
2022-12-19
Wuhan Weituo Fluid Control Equipment Co., Ltd
Address: 1706, Building D, Wuhan Living Room, No.8 Hongtu Avenue, Dongxihu District, Wuhan City
Telephone:0086-18942929031 0086-18571829295
Landline:0086-027-83612831
Fax: 0086-027-83612830
E-mail:watosong@watovalve.com
Website:www.watoer.com
