Adjust the selection of pneumatic valve

the order of the pneumatic valve main functions are: ( ） Sequential control multiple components; （ ） For the holding circuit; （ ） To prevent the fall caused by dead weight oil cylinder piston pneumatic valve with do balance; （ ） With the external control pneumatic valve, pneumatic valve in order to do unloading pump unloading; （ ） In internal control order back pressure pneumatic valve pneumatic valve. Sequence of the pneumatic valve selection: sequential pneumatic valve according to the different assembly structure, can achieve the function of different circuits, such as overflow pneumatic valve, pneumatic valve order and balance the function of the pneumatic valve. Sequence of the pneumatic valve opening and closing, if poor, the traffic is bigger when a pressure is too high, circuit efficiency is lower. Open/close with hysteresis, opening pressure is lower than the closure pressure, load flow changes should be pay attention to. Pneumatic valve opening pressure is too low, again before when pressure is lower than the set pressure, actuator caused by misoperation. By the flow pneumatic valve is far less than the rated flow, vibration or other unstable phenomenon. At this time to go back to the way to apply it. The selection of type pneumatic valve regulating pneumatic valve pneumatic valve type had better choose the function is all ready, light weight fully functional ultra light regulating pneumatic valve to replace other pneumatic valve products, can simplify use futures products because of the function is not complete and worry about improper selection ( Such as straight stroke of the pneumatic valve block problem; Cut off relations with differential pressure and so on. Actuator selection actuator options: (1) chooses import electronic actuator, overcome a series of unreliable problems; (2) the diaphragm actuators choose pure small series; (3) piston actuator gear type of article should be considered; (4) told the differential pressure pneumatic valve closed, selected by factory actuator size. 3 the problem more complex material choice. Due to many corrosive medium of ptfe there is no corrosion, therefore, appropriate chooses all four fluorine pneumatic valve corrosion, the corrosion situations of selection was simplified greatly, just as the temperature & gt; ℃ 、 < －４０ ℃、 PN≥. KPa, raise again consider corrosion resistant alloy. 4 spring range of choice for thin film actuator pneumatic valve, now most of the occasions with locator, can make full use of KPa gas source, choose a medium stiffness, but also take into account larger output force of the spring ~ KPa; Similarly, the piston actuator chooses ~ KPa. 5 flow, the choice of (1) when the parameters make no choice logarithmic: (2) when the modulated system response speed faster, such as flow control, liquid pressure adjustment, choose log; When the system response speed slower, liquid level system, temperature regulating system, choose a straight line; (3) the S value is lesser, choose log; (4) may be small open of the pneumatic valve is working, selected log.