An elastic sphere obtains elasticity by opening an elastic groove at the lower end of the inner wall of the sphere. When closing the channel, use the wedge head of the valve rod to expand the ball and compress the valve seat to seal. Loosen the wedge head before rotating the ball, and the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction and operating torque of the sealing surface.

1) When measuring mixed phase fluid, choose a place that will not cause phase separation; When measuring two-component liquid, avoid loading it at the downstream where the mixture is not uniform; When measuring the chemical reaction pipeline, it shall be installed at the downstream of the fully completed reaction section; Try to ensure that the front and rear straight pipe sections are not less than 5D and 2D respectively;
2) Try to avoid negative pressure in the measuring pipe;
3) Avoid large motors and transformers nearby to avoid electromagnetic interference;
4) Places easy to realize independent grounding of sensors;
5) Try to avoid high concentration corrosive gas in the surrounding environment;
6) Select the place with small vibration, especially for the integrated instrument;
7) Avoid direct sunlight as much as possible