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.

It is better to measure and record the electrode contact resistance of the electromagnetic flow sensor at the time of commissioning of the newly installed instrument, and then measure it every time during maintenance (the resistance values measured by analysis and comparison must be measured by using the same type of multimeter and the same measurement gear). Analysis and comparison will help to judge the instrument fault in the future, and the flow sensor will be omitted from the pipeline for inspection.