The working principle and application of reduced pressure pneumatic valve techniques

the reduced pressure, the working principle of pneumatic valve
the reduced pressure pneumatic regulating pneumatic valve pneumatic valve is a necessary accessories, main effect is to air pressure decompression and stability to a fixed value, in order to regulate the pneumatic valve to obtain stable gas source power for regulating control. According to the structural form can be divided into the diaphragm, diaphragm spring, piston, lever and bellows type; According to the pneumatic seat number can be artificial single-seat type and two-seater type; According to the position of the pneumatic disc different can be divided into positive action and reaction type.
when the output of the reduced pressure pneumatic valve, pressure higher or larger regulating directly with pressure regulating spring, the spring stiffness is too large, flow changes, the output pressure fluctuation is bigger, the structure of the pneumatic valve size will also increase. In order to overcome these shortcomings, can use the guide type pneumatic valve to relieve stress. Pilot operated relief the working principle of pneumatic valve and straight acting basically the same. Pilot operated relief pressure regulating gases used in the pneumatic valve, is made up of small straight moving type relief supply of pneumatic valve. If the small straight moving type relief pneumatic valve is installed in the pneumatic valve body interior, it is called a internal pilot operated pressure pneumatic valve; If the small straight moving type relief pneumatic valve is installed in the main aerodynamic body outside, it is called a external pilot operated relief pneumatic valve. Figure - Shown for internal pilot operated relief structure diagram of pneumatic valve, pneumatic valve compared with straight moving type relief, the pneumatic valve increased by the nozzle, baffle, fixed orifice and the gas chamber of the nozzle flapper amplification B. When the distance between the nozzle and the baffle is small change, can cause stress in the room B obvious changes, which causes the displacement of the diaphragm have larger to move up and down control of pneumatic valve core, make the inlet pneumatic valve mouth up or down, improves the sensitivity of pneumatic control valve core, which improved the precision of voltage regulation.