The forging forming of the large diameter stop valve body was realized on small and medium-sized equipment, and the energy-saving and labor-saving characteristics of the shear extrusion forming process were verified. The body of large stop valve can be integrally forged on existing domestic equipment. In addition. The forging forming of tee pipe and other large branch parts can be studied by using the shear extrusion technology.

Electromagnetic flowmeter has been widely used in industry, medicine and other industries due to its convenient installation and use, simple structure and operation, high measurement accuracy, measurement results not affected by external physical parameters, alarm function and fault self diagnosis. Electromagnetic flowmeter is an instrument for measuring the volume flow of conductive liquid, which is made by Faraday's law of electromagnetic induction. Since the early 1950s, China has realized the industrial application of electromagnetic flowmeter. In recent years, the output of electromagnetic flowmeter in the world has been in an important position in the output of industrial flow meters. Generally speaking, electromagnetic flowmeter is composed of flow sensor transmitter. The flow sensor converts the volume flow of conductive liquid flowing through the pipe into a linear electrical signal. The transmitter is composed of excitation circuit, signal filtering and amplification circuit, A/D sampling circuit, microprocessor circuit, D/A circuit, transmission circuit, etc. The conversion principle is Faraday's law of electromagnetic induction, that is, the conductor cuts the electromagnetic line through the magnetic field to generate aerodynamic force. The magnetic field of the flow sensor is realized by excitation, and now most flow sensors use low-frequency square wave excitation. In the electromagnetic flowmeter, the conductive medium in the measuring tube is equivalent to the conductive metal rod in the Faraday test, and the two electromagnetic coils at the upper and lower ends generate a constant magnetic field. When a conductive medium flows through, an induced voltage will be generated. Two electrodes inside the pipe measure the induced voltage generated. The measuring pipe is electromagnetically isolated from the fluid and the measuring electrode through non-conductive linings such as rubber and Teflon.