With the continuous improvement of industrial automation, the regulating valve is used as the final actuator of the automatic adjustment system, and it is more and more widely used. The application of the regulating valve is directly related to the quality and safety of production. Therefore, the company combines the design of long-term production automation system, instrument modeling and installation, commissioning and maintenance experience to explain the application of membrane regulator valve. Selection of pneumatic diaphragm regulating valve: (1) According to the requirements of use, the pneumatic diaphragm regulating valve is composed of two parts: the valve core and the valve body (including the valve seat), and has different structural forms according to different use requirements. The pneumatic diaphragm regulating valves produced by Shanghai Nengen Valve Factory mainly include: straight-through single-seat regulating valve, two-seat regulating valve and high-pressure angle regulating valve...more. The straight-through single-seat control valve has a small leakage amount, and the unbalance force generated by the fluid to the thrust of the single-seat valve core is large. Therefore, the straight-through single-seat control valve is suitable for requiring a small leakage amount, a small pipe diameter, and a low differential pressure before and after the valve. occasion. The two-seat control valve has two upper and lower spools, which are roughly offset by the opposite direction of the thrust acting on the upper and lower spools. Therefore, the imbalance force of the two-seat control valve is small, allowing a large differential pressure before and after the valve. . However, due to the complicated flow path in the valve body, the erosion damage to the valve body during the high pressure difference is serious, and it is not suitable for the medium with high viscosity, suspended particles or fibers. In addition, due to the limitation of processing conditions, the upper and lower two valve cores of the two-seat control valve are not easy to be closed at the same time, so the leakage amount is large when closed, especially when used at high temperature or low temperature, because the thermal expansion coefficient of the material is different, it is more likely to cause A serious leak. The high-pressure angle control valve body is a right angle type, with simple flow path, low resistance, and low erosion by high-speed fluid. It is especially suitable for high pressure difference, high viscosity and fluid containing suspended particulate matter, and can also be used for steam treatment. Liquid mixed phase, easy to flash and eroded. This valve body avoids coking, sticking and clogging, making it easy to clean and self-clean. (2) According to the safety selection, the pneumatic diaphragm regulating valve has two forms: an air opening valve and a gas closing valve. According to the safety and use requirements of different production processes, when the signal pressure is interrupted, the regulating valve is in the open or closed position, which depends on the hazard of the process production. If the valve is in the closed position, the hazard is small, then the air valve is selected. When the signal pressure is interrupted, the regulating valve is in the closed position. Otherwise, the air closing valve is selected. (3) Flow characteristics In the design process of the automatic control system, the selection of the pneumatic diaphragm regulating valve should focus on the flow characteristics. Typical ideal characteristics are linear flow characteristics, equal percentage flow characteristics (log flow characteristics), fast open flow characteristics, and parabolic flow characteristics. When the linear flow characteristic has the same change in the relative opening degree, the relative change value of the flow rate is large; when the flow rate is large, the relative change value of the flow rate is small. Therefore, the linear flow regulating valve has poor regulation performance under small opening (small load) conditions, is difficult to control, and tends to oscillate, so the linear flow characteristic regulating valve should not be used for small opening conditions, and should not be used for load changes. Larger adjustment system, suitable for adjustment systems with relatively stable load and little change. The regulating valve with percentage flow characteristic has weak regulation effect at small load, strong regulation of large load, it has weak regulation effect when it is close to close, work is gentle and stable, and when it is close to full opening, the adjustment effect is strong, work is sensitive and effective, to a certain extent It can improve the adjustment quality, so it is suitable for occasions with large load changes, which is better in both full-load production and half-load production. (4) The selection of the regulating valve diameter should be based on the known fluid to calculate the required flow coefficient CV, and then select the appropriate regulating valve diameter according to the product technical parameter table. Pay attention to the difference between liquid, gas, water vapor and other vapors when calculating CV. For the size specifications, please provide detailed parameters, the factory is produced according to the national designated standards.
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