Adjust the selection of pneumatic valve

the main function of the pneumatic valve command: ( ） The motion sequence of control components; （ ） Packing circuit; （ ） To prevent fuel tank caused by dead weight, with the piston down balance pneumatic valve ( ） External control order pneumatic valve, pneumatic valve unloading pump unloading; With the internal control of back pressure pneumatic valve pneumatic valve in order ( ） 。 Pneumatic valve sequence of the pneumatic valve selection: order according to different circuit can realize the assembly structure, such as overflow, pneumatic valve, pneumatic valve pneumatic valve and balance in order of different functions. Especially when the pneumatic valve opening and closing order is not good, traffic is bigger, once the pressure is too high, the cycle efficiency. The characteristics of opening and closing lag, low opening pressure is lower than the closure pressure, load flow changes should attract attention. Pneumatic valve opening pressure is too low, lower than the set pressure before the leak pressure, lead to drive failure. By a pneumatic valve flow far more than the rated flow, vibration or other small instability. This time to take steps to return path. ） Pneumatic valve pneumatic valve fully functional, the choice of the best choice for light weight, fully functional ultra light regulating pneumatic valve, pneumatic valve to replace other products, simplify the relevant futures product selection function is not complete, because of concerns about the choice of inappropriate ( Such as straight travel pneumatic valve to combat the problem; Cut off relations with pressure, etc) The trouble. ） Actuator actuator selection options: (1) choose import electronic actuator overcame a series of problems is not reliable; (2) series of fine small thin film actuator selection; Article (3) piston actuator gear should be considered; (4) told the pneumatic valve closing pressure, the selected plant size of the actuator. ） The choice of materials, the problem more complicated. Because many of ptfe corrosive medium corrosion does not exist, you should use all teflon pneumatic valve corrosion resistance, corrosion resistance is greatly simplifies the choice for many times, but when the temperature '℃, & amp; lt; - ℃, or false. KPa, then consider corrosion resistant alloys. ） And the selection of films of the pneumatic valve actuator spring range, is most places are equipped with a positioning device can use KPa gas source, the choice of medium hardness advantage, also considering the large output force of spring? KPa; Similarly, in? KPa piston actuator used. ） The flow characteristic of selected parameters can not be, a few special options: (2) when the air conditioning system response speed faster, such as traffic control, fluid pressure regulator, election, there are a few special; When the system response speed slower, level system, temperature control system, linear special election; (3) the S value is small, number of special election; (4) pneumatic valve can work in a small open degree, choosing the right number is special.