In addition, the pneumatic butterfly valve is small and light, easy to disassemble and repair, and can be installed at any position. Simple and compact structure, small operating torque, and quick 90 ° rotation opening. The flow characteristics tend to be straight, and the regulation performance is good. The connection between the butterfly plate and the valve rod adopts a pin free structure, which overcomes the possible internal leakage point.

Classification of electromagnetic flowmeters The caliber range of electromagnetic flowmeters is wider than that of other types of flow meters. E+H Company provides three types of sensors, W, P and H, which are respectively used in the water and sewage industry (W type), the chemical industry, food industry (P type), and the food and pharmaceutical industry (H type). The caliber range is from 2mm to 2m. The transmitter can provide more than 10, 50, 23 and 53 options. 10 is economic type for water industry development, 50 is ordinary type, 53 is enhanced type, and 23 is two-wire system. The precision can be 0.5% or 0.2%. It can measure both positive and negative flow and pulsating flow.