Sealing principle of butterfly valve When processing the valve plate, ensure that its sealing face has a suitable surface roughness value, and the synthetic rubber valve seat forms a suitable surface roughness value when molding. When the valve is closed, through the rotation of the valve plate, the outer sealing surface of the valve plate squeezes the synthetic rubber valve seat, making the synthetic rubber valve seat produce elastic deformation and forming elastic force as the sealing pressure to ensure the sealing of the valve.

[Features of electromagnetic flowmeter]
1. The measurement is not affected by the changes of fluid density, viscosity, temperature, pressure and conductivity;
2. There are no obstructing flow parts in the measuring pipe, no pressure loss, and low requirements for straight pipe section. It has unique adaptability to slurry measurement;
3. Reasonable selection of sensor lining and electrode materials means good corrosion resistance and wear resistance;
4. The converter adopts a novel excitation mode, with low power consumption, stable zero point and high accuracy. The flow range can reach 150:1;
5. The converter can be integrated or separated with the sensor;
6. The converter adopts 16 bit high-performance microprocessor, 2x16LCD display, convenient parameter setting and reliable programming;
7. The flowmeter is a two-way measurement system with three integrators installed inside: total forward, total reverse and total difference; It can display positive and negative flow, and has multiple outputs: current, pulse, digital communication, HART;
8. The converter adopts surface mounting technology (SMT), with self inspection and self diagnosis functions;
9. The measurement accuracy is not affected by the changes of fluid density, viscosity, temperature, pressure and conductivity. The sensor induced voltage signal is linear with the average flow rate, so the measurement accuracy is high.
10. There is no choke in the measuring pipe, so there is no additional pressure loss; There are no moving parts in the measuring pipe, so the sensor has a very long life.
11. Since the induced voltage signal is formed in the whole space full of magnetic field and is the average value on the pipe load surface, the straight pipe section required by the sensor is shorter, with a length of 5 times the pipe diameter.
12. The converter adopts the latest and most advanced MCU and SMT technology, with reliable performance, high precision, low power consumption, stable zero point and convenient parameter setting. Click Chinese display LCD to display cumulative flow, instantaneous flow, flow rate, flow percentage, etc.
13. Two way measuring system, which can measure forward flow and reverse flow. Special production process and high-quality materials are adopted to ensure the stability of product performance for a long time.