It is far from meeting the requirements of many media in the market. For example, when the operating medium is rosin, the operating temperature of the thermal insulation pneumatic ball valve is required to be 300 ℃, which is conducive to the rosin medium to obtain more ideal liquidity. The traditional O-ring as a sealing part cannot meet its requirements.
2 Improvement measures According to the existing problems of thermal insulation pneumatic ball valve, determine to improve the sealing material and structure of thermal insulation pneumatic ball valve.

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, PROFIBUS, Modbus, CONFIG, FF field bus, etc.