Introduction to the application of pneumatic diaphragm regulating pneumatic valve

with the constant improvement of the industrial automation level, adjust the pneumatic valve, as a final actuator, automatic control system is more and more widely used, adjust the stand or fall of pneumatic valve application related directly to the production of quality and safety. Therefore, the combination of my long engaged in the design of the automatic control system, instrument modelling and installation, commissioning and maintenance experience, to talk about a film regulating pneumatic valve application. Pneumatic diaphragm regulating pneumatic valve selection. According to the requirement type pneumatic diaphragm regulating pneumatic valve by pneumatic valve core and valve body ( Including pneumatic seat) In two parts, according to the requirements of the use of different have different structure forms, the current YingQing chemical co. , LTD. , henan regulating pneumatic valve used in pneumatic membrane mainly include direct single-seat pneumatic valve, two-seat regulating pneumatic valve and pressure Angle type pneumatic valve adjustment. Through single-seat pneumatic valve leakage is small, fluid in single-seat pneumatic valve core is formed by the thrust of unbalanced force is very big, so the pass-through single-seat pneumatic valve is suitable for the requirements of small, small diameter and pneumatic valve leakage at a lower pressure difference before and after. Straight two-seater pneumatic valve pneumatic valve body with two pneumatic valve core, due to the fluid action in the direction of thrust fluctuation pneumatic valve core and roughly offset; So the two-seater pneumatic valve unbalanced force is small, allows for a larger pressure difference before and after pneumatic valve. Due to the complex pneumatic valve body flows, when used in high pressure difference of the pneumatic valve body erosion damage is serious, should not be used in high viscosity, medium containing suspended particles or fiber. In addition, due to the limitation of processing conditions, two-seater pneumatic valve and two pneumatic valve core is not locked at the same time, so closing leakage is large, especially in situations of high and low temperatures, due to the thermal expansion coefficient of material is different, are more likely to lead to serious leakage. Angle type high pressure pneumatic valve pneumatic valve body is rectangular type, flow is simple, small resistance, erosion by high velocity is small, especially suitable for high pressure, high viscosity and poor quality fluid containing suspended particle synthesis, can also be used to deal with vapor liquid miscible, easy to flash steam corrosion occasion. This pneumatic valve can avoid coking, bonding and congestion, facilitate cleaning and self-purification. 。 According to the security type pneumatic diaphragm regulating faintly pneumatic valve pneumatic valve and open her breath valve in two forms. According to the different production process safety and use requirement of consideration, to be interrupted when the signal pressure regulating pneumatic valve is in open or closed position, to process the harmfulness caused by size. If less harmful when the pneumatic valve in the closed position, choose gas drive pneumatic valve, pressure signal is interrupted, make regulating pneumatic valve in the closed position, on the contrary, choose air breath valve. 。 Flow characteristic in the design of the automatic control system in the process of choosing pneumatic diaphragm regulating pneumatic valve flow characteristics should be considered. The properties of the ideal typical linear flow characteristics, such as percentage flow characteristics ( Logarithmic flow characteristic) , quick opening four flow characteristic and parabolic flow characteristics. Linear flow characteristic in the same relative opening degree change, flow hour flow relative value changed; Large flow, the flow relative change value is small. Therefore, linear flow control in a small open of the pneumatic valve ( Small load) Cases regulation performance is bad, not easy to control, tend to produce oscillation, so the linear flow characteristic adjustment should not be used for small open of the pneumatic valve, also should not be used for load change larger regulating system, and is suitable for the load is more stable, little change control system. Percentage flow characteristic of regulating pneumatic valve in a small load regulation is weak, big load regulation is strong, it is close to closing weak regulation, work smooth gentle, fully open and close to adjust action is strong, sensitive and effective work, to a certain extent, can improve the regulating quality, so it is suitable for the load change is bigger, both in full load production and half load production better regulating role. 。 Adjust the pneumatic valve diameter should be selected according to the known fluid required to calculate the flow coefficient CV, then according to the product technical parameter table to select suitable regulating pneumatic valve diameter. When calculating the CV to the attention of the liquid, gas, water vapor and other difference of steam.
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