Installation and commissioning methods and precautions for cylinder and valve body First, put the valve in the closed state with external force, first put the valve in the closed state with external force, that is, rotate the valve shaft clockwise until the valve plate contacts the valve seat seal, and at the same time, put the cylinder in the closed state (that is, the small groove above the cylinder shaft is vertical to the cylinder body for the valve that rotates clockwise to close the valve), Then install the cylinder onto the valve (the installation direction can be parallel or vertical to the valve body), and check whether the screw hole is aligned without too much deviation. If there is a little deviation, rotate the cylinder body a little, and then tighten the screws. For commissioning of pneumatic butterfly valve, first check whether the valve accessories are installed completely, solenoid valve, etc., if not, commissioning is not allowed. The normal air pressure of the feeder is 0.6MPA ± 0.05MPA. Before operation, ensure that there are no sundries stuck in the valve body at the valve plate. During commissioning, manually operate the solenoid valve manual button (the solenoid valve coil loses power during manual operation, and manual operation is effective; During the electric control operation, the manual operation is effective only when the manual knob is set to position 0 and the power is lost; Position 0 is to close the valve, position 1 is to open the valve, that is, to open the valve with power on. If the valve needs to be closed with power off, position 1 is to close the valve and rotate the solenoid valve coil 180 degrees for installation), and observe the operation status of the valve.

How to achieve anti-corrosion effect of pneumatic butterfly valve
The pneumatic butterfly valve will form an oxide film on the surface after reacting with the oxygen in the atmosphere. The iron oxide formed on ordinary carbon steel continues to stop oxidation, so that the corrosion will expand from time to time and eventually form holes. It is possible to apply paint or oxidation resistant metals (such as zinc, nickel and chromium) to stop electroplating to ensure the appearance of carbon steel, but, as people know, this maintenance is just a film. If the maintenance layer is destroyed, the steel below will begin to rust.
The corrosion resistance of pneumatic butterfly valve depends on the chromium content. When the chromium content reaches 10.5%, the atmospheric corrosion resistance of steel increases significantly, but when the chromium content is higher, although the corrosion resistance can still be improved, it is not obvious.
The reason is that when the steel is alloyed with chromium, the type of external oxide is changed to be similar to the external oxide formed on pure chromium metal. This tightly adhered chromium rich oxide maintains the appearance and avoids further oxidation. This kind of oxide layer is extremely thin, through which you can see the natural luster of the stainless steel surface, so that stainless steel has a common appearance. Moreover, if the surface layer is damaged, the exposed steel surface will stop self repairing with the atmospheric reaction, and form this "passivation film" again to continue to play a maintenance role.