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The valve body of pneumatic actuators is a disc-shaped safety butterfly valve plate which is made around the axis of rotation of 0-90° in the cylindrical path. The valve is fully closed when the disc is at 0° and is fully open when the disc rotated to 90°. Butterfly has a better flow control characteristics: when butterfly is in the fully open position, the butterfly valve plate thickness is only the resistance when the medium flowing through the valve, and the pressure drop generated is small. The connections between and butterfly and pipe are wafer, flanged and welded connections. Wafer butterfly valve connected with studs between two pipe flanges. Flanged butterfly valve is a valve with a flange which bolts at both ends of the valve connecting flange on the pipe. Another is directly welded pipe valve body for high pressure pipelines. Butterfly valve seal structure is the most critical part, directly related to the overall performance of the valve which determines its life and effect. The butterfly has bombs and metal seal, two basic forms of sealing. Different sealing are applied in different media forms and temperatures of media.
According to butterfly valves’ characteristic, the butterfly valve selection for pneumatic actuators depends on many factors. Firstly, the basic variables should be clear for the enterprise who wants to use the butterfly for pneumatic actuators. The ubiquitous variables like product type and name, nominal diameter DN (mm), nominal pressure of pneumatic actuators, flow characteristics, pneumatic actuators’ body material and sealing requirements, rated flow coefficient, media type and temperature range, valve after pressure (pressure), air pressure and control signals and other special requirements. The baseline for Butterfly Valve selection is to fit the using parameters of pneumatic actuators.
On the other hand, choosing the appropriate deployment and maintenance method is another important aspect for valve selection for pneumatic actuators. Due to pneumatic actuators’ some functional feature, the butterfly valve must fit those points. The upright vertical valve should be installed in the pipe on pneumatic actuators for best, valves have larger weight should be added to the supporting frame vibration occasionally. The valve’s selection also needs to take the pneumatic actuators’ bearing tap to avoid the excessive stress on the pipe flange or severe type harmonic shaft. Moreover, choose the clean component or cleaning the filter is necessary for pneumatic actuators. The component on pneumatic actuators can be cleaned at fixed period in some condition. In addition, the installation environment should be put more attention because the environmental factors like temperature will affect the performance of pneumatic actuators somewhat. The valve should be installed in an ambient temperature of -20℃-60℃, the relative humidity should be less or equal to 95% and no serious corrosive gas environment will be much better.
In practical operation, the condition will be more complex and time-consuming for selecting the right butterfly valve for pneumatic actuators. The functional mechanism of pneumatic actuators is different to other actuators so the selection procedure not only depends on the common knowledge on pneumatic actuators but also on the real practice with it.