Pneumatic pneumatic regulator is how to work?

Pneumatic pneumatic control valve is a very commonly used in pneumatic control valve, it is the method of using compressed air to make power, easy to use simple, so popular with the public's favorite, here small make up take you to have a look at its working reason and classification. Any machine work requires the power, some of them are the external fuel power, and some of the energy conversion is used to achieve gain momentum effect, machine valve is one of them use of energy to make machine tools. Among them, the pneumatic valve is a use of compressed air machine equipment, the principle of exquisite. Pneumatic working principle of the pneumatic control valve, pneumatic pneumatic control valve is to air as power and cylinder as actuator, 4 ~ 20 ma signals as the drive, and by means of electric valve positioner, converters, solenoid valve, a valve such as attachments to drive the valve, the valve is a linear or equal percentage flow characteristics do adjust action, so as to achieve to the pipeline medium flow, pressure, temperature and other process parameters of the switch quantity or proportion type adjustment. Pneumatic pneumatic - valve control with simple and quick response, and the advantages of intrinsically safe, and use in flammable and explosive occasions, don't need another explosion protection measures. Pneumatic pneumatic - valve usually are connected by a pneumatic actuators and pneumatic control valve installation and debugging of pneumatic actuators can be divided into single acting and double acting type two kinds, single-acting actuator with reset spring, and double-acting actuators is no return spring. Including single-acting actuator, loss of origin or sudden failure, automatic homing to the initial set up by the valve open or closed. Pneumatic valves according to the form of action points gas open type and close type two kinds, namely the so-called normally open and normally closed, pneumatic pneumatic control valve of gas or gas close, usually by positive and negative effects of the actuator and valve structure of different assembly way. Pneumatic pneumatic - valve action points gas open type and close type pneumatic pneumatic - valve action points gas open type and close type two kinds. Gas type ( 空气打开) Is when the film head air pressure increases, the valve to increase the opening direction of the movement, when to input pressure limit, the valve is in the fully open position. On the other hand, when the air pressure is reduced, the valve moves in the direction of closing, when no input air, the valve full close. So sometimes gas type valve is also called fault closed type ( 失败关闭FC) 。 Type gas clearance ( 空气关闭) Movement direction is just the reverse of gas drive type. When the air pressure increases, the direction of the valve to close actions; Air pressure decreases or not, or fully open valve to open direction. So sometimes called fault open type ( 无法打开FO) 。 Pneumatic pneumatic control valve of gas or gas close, usually by positive and negative effects of the actuator and valve structure of different assembly way. Gas-off choice is according to the process of production safety perspective to consider. When gas source to cut off the pneumatic control valve is in the closed position safety or open position? For example, a heating furnace combustion control, pneumatic control valve installed in the fuel pipe road, according to the temperature of the furnace or the temperature of the heated material in furnace exit to control the supply of fuel. At this time, appropriate chooses gas valve is safer, because once the air stop supply, valve in the closed is more suitable than the valve is fully open. If air supply interruption, fuel valve fully open, can make the heat excess risk. And as a use of cooling water cooling of heat exchange equipment, hot material in the heat exchanger and heat is cooling water cooling, pneumatic control valve installed on the cooling water pipe, use after heat exchange materials to control the cooling water temperature, the gas source is interrupted, pneumatic control valve should be in an open position safer, appropriate chooses gas closed type ( The FO) Pneumatic control valve. Gas open change for gas closed type or closed type gas for gas open, such as pneumatic - valve equipped with smart valve positioner, can easy to switch from the each other at the scene. But there are some occasions, when a failure does not want the valve is in full open or close position, operation is not allowed, but hope that a failure to keep before the expiration of the original location. At this moment, can take some other measures, such as using the position valve or set special air cylinder storage facilities to ensure that the accident. Valve positioner valve positioner is the main accessories, pneumatic control valve with pneumatic control valve of pneumatic greatly, it accepts the regulator output signal, and then to its output signal to control pneumatic pneumatic control valve, when the pneumatic control valve, the valve stem of the displacement feedback through mechanical device to valve positioner, valve position condition through the electrical signal to the upper system. Valve positioner according to its structure and working principle can be divided into pneumatic valve positioner, electricity, gas valve positioner and smart valve positioner. Valve positioner can increase the output power of the pneumatic control valve, reduce the number of control signal transmission lag, to speed up the movement of the valve stem, can improve the linearity of the valve, overcome the friction of the valve stem and eliminate the influence of unbalanced force, so as to ensure the correct positioning of the pneumatic control valve. Commonly used actuator pneumatic actuator, electric actuator, have straight stroke, stroke. For automatic and manual open and close all kinds of cutting the door, the wind plate, etc