4. The failure phenomena of regulating valve failure include:
(1) No signal, no air source. The reason is that the air source is not opened or fails, the air duct is blocked or the pressure reducing valve fails due to blockage, and the compressor has a fault light;
(2) There is air supply but no signal. The reason is that the positioner fails due to air leakage due to the rupture of bellows, or the converter fails;
(3) The positioner has no air supply. The reason is that the filter and pressure reducer are blocked and fail;
(4) The positioner has air supply but no output. The cause is that the locator orifice is blocked and the fault occurs;
(5) There is signal but no action. The reason is that the valve core falls off; The valve rod is bent or broken.

In electric power, chemical industry, environmental protection and other industries, we can often see the "hard work" operation of pneumatic switch ball valves. Nowadays, the pneumatic switch ball valve has already become an indispensable important device in the automation industry, especially with the convenient and environmentally friendly installation method, it is favored by many customers. As a purchase novice, how to choose a ball valve? Yoshi Fluid Editor will briefly introduce some shopping elements.