After cleaning, it is necessary to wait for the volatilization of the cleaning agent on the washed wall surface (it can be wiped with a silk cloth not soaked in the cleaning agent) for assembly, but it shall not be put aside for a long time, otherwise it will rust and be polluted by dust.
New parts shall also be cleaned before assembly.
Lubricate with grease. The lubricating grease shall be compatible with the metal materials, rubber parts, plastic parts and working media of the ball valve. When the working medium is gas, for example, special 221 grease can be used. Apply a thin layer of grease on the surface of the seal mounting groove, a thin layer of grease on the rubber seal, and a thin layer of grease on the sealing surface and friction surface of the valve stem.
During assembly, it is not allowed to have metal chips, fibers, grease (except those specified for use), dust and other impurities, foreign matters, etc. contaminating, adhering to or staying on the surface of parts or entering the cavity.

Tips for stainless steel pneumatic butterfly valve device
1. The other end of the stainless steel hose on the pipeline away from the vibration source shall be effectively fixed so that the flexible joint can isolate and absorb vibration.
2. When the electric welding operation is stopped at the construction site, the bellows shall be effectively protected to avoid splashing of welding slag on the bellows.
3. Stainless steel hoses must be installed in a straight line, and shall not be bent or translated.
4. After the device is completed, the nut and spare nut on the pull rod shall be locked, and the pull rod and nut shall not be removed.
5. The medium used shall not be corrosive to the corrugated pipe data, and the chloride ion content in the medium shall be ≤ 25PPM6. During installation, the product length can be properly adjusted by pulling rod, and the adjustment amount shall not be greater than the regular value. Welcome broad users to choose the manufacturers on the right track to stop customized consumption- Broad new special manufacturers can generally divide pneumatic butterfly valves into three lengths:
The first is the shrink length, that is, the length when the hose is tightened to the limit position; The second is the length of the device, which is the length of the hose when it is in the middle of half of the maximum displacement; The third is the stretching length, which is the length when the hose is stretched to the maximum limit.
When installing the hose, the hose should be in the middle position, which is called the length of the device. Under the device state at this position, when the hose is subjected to axial load, it can move in two directions. Otherwise, if it can only move in one direction, it will affect the strength of the pneumatic butterfly valve and reduce its service life. 　
In the process of implementing the device, considering that using a ruler to measure the length of the hose according to the calculation results and then stopping the device may affect the consumption efficiency, some foreign consumers directly install the ruler on the hose and cut off the ruler after installation. Quality has always been the first lifetime productivity!