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Selection and Development Direction of Pneumatic Butterfly Valve

In the automatic control system, the pneumatic butterfly valve is an important actuator. The quality of the pneumatic butterfly valve is determined. The main response is the adjustment quality of the system. With the continuous development of industry, we have a deeper understanding of the importance of butterfly valves. Want to know the application of butterfly valve is good or bad, in addition to the use, maintenance, quality and other aspects, but also the correct selection.
If it is to calculate the type of mistakes, it is easy to cause the device to open and stop, or even simply can not be used, so the purchaser must pay attention to the issue of pneumatic butterfly valve selection, specifically, is to follow the following major selection principles :
First, according to the process conditions, select the appropriate structure and materials;
Second, refer to the characteristics of the process object and select the flow characteristics of the pneumatic butterfly valve that is in compliance;
Third, refer to the process operating parameters to find a suitable size of the pneumatic butterfly valve;
Fourth, according to the requirements of the process, find suitable auxiliary devices;
Fifth, the choice of implementing agencies should not be blind, but a reasonable choice.
After discussing the selection of the butterfly valve, we must also look at its direction of development. Mainly from the parts and components analysis: the use of small actuators can effectively reduce costs, improve the flow capacity, reduce the flow resistance, but also can effectively reduce the pressure loss at both ends of the valve. The forward development of the butterfly valve is inseparable from the rise of hermeticity, so sealing issues are particularly important when designing butterfly valves. Of course, performance indicators such as friction and service life cannot be ignored. However, with the study of the stuffing box and packing structure in recent years, it has made it widely used in the transformation of pneumatic butterfly valves. Pneumatic butterfly valves such as those supplied by José Co., Ltd. use a variety of methods to reduce the noise of the device, such as the use of expanders, multi-stage valve cores, etc., and are favored by customers.
In the current era of digital information, many times, functional valve positioners or digital controllers are used to apply non-linear laws, and the flow characteristics of pneumatic butterfly valves are rarely used to compensate the nonlinearity of the controlled object. Obviously, the material of the internal parts of the valve will change with the change of temperature, and the thermal expansion at different temperatures needs to be taken into account. Of course, the pressure rating at high temperatures and the like should also be considered.

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