5. Design and manufacture of pneumatic ball valve The application of CAD, CAM and FMS in the valve industry has brought the design and manufacture of pneumatic ball valve to a new level. Not only has the design and calculation method of valves been comprehensively innovated, but also the heavy and repetitive routine design work of professional technicians has been alleviated, so that technicians have more energy to improve and improve product performance and new product development, shorten the research and development cycle of new products, and comprehensively improve labor productivity, Due to the application of CAD/CAM, the valve stem spiral flat, which is produced by computer aided design and computer aided numerical control machine tools, has emerged, making the metal sealed pneumatic ball valve free of any scratch and wear during the opening and closing process, thus greatly improving the sealing performance and service life of the pneumatic ball valve. When the pneumatic ball valve is fully opened, the flow resistance is very small, almost equal to zero. Therefore, the equal diameter pneumatic ball valve is widely used in oil and gas pipelines because it is easy to clean pipelines. Since the ball of the pneumatic ball valve is wiping in the opening and closing process, most pneumatic ball valves can be used in the medium with suspended solid particles, and the materials based on the sealing ring can also be used in the powder and granular medium.

The function of electromagnetic flowmeter in the market is also very different. The simple thing is to measure one-way flow, and only output analog signals to drive the rear instrument; Multifunctional instruments include two-way flow measurement, range switching, upper and lower limit flow alarm, air pipe and power cut alarm, small signal removal, flow display and total amount calculation, automatic verification and fault self diagnosis, communication with upper computer and motion configuration. The serial digital communication function of some models of instruments can select multiple communication interfaces and special chips (ASIC) to connect HART protocol system, PROFTBUS, Modbus, FF field bus, etc.