How to determine the flow direction of the medium in a wafer butterfly valve?
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I would like to ask those of you: for butterfly valves similar to the one in the image below, where no flow direction arrows are indicated on the valve body, how can one determine the direction of the fluid flow? Is there any requirement regarding the flow direction for such valves? Thank you (image sourced from the internet)
Centerline butterfly valves have no flow direction, while eccentric butterfly valves generally have a flow direction
Generally, butterfly valves have no specific requirements regarding flow direction; it depends on the installation location. If the valve is installed vertically, the medium in the pipeline will create static pressure, and in such cases it is necessary to consider installing the valve in the opposite direction to that of opening, so as to prevent the valve disc from being pressed open by the static pressure and causing leakage of the medium