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Three basic driving methods of valves can be divided into several categories.

A ball valve is mainly used as a shut off valve,when the lever is in-line with the pipe, the valve is open, and when the valve is perpendicular to the pipe, it is closed.  

Check valve refers to a valve whose opening and closing part is a circular disc and acts by its own weight and medium pressure to block the back flow of the medium.

Handheld ultrasonic flow meters use clamp-on sensing to measure liquid flow. The installation process is extremely simple, and the full Chinese man-machine interface is easier to operate.