Disc valve - pipe fittings, which is a disk-shaped valve located on the same axis with the rod, through which the control effect on the disk is carried out. Rotary butterfly valves-are used to work with the flow of liquid in any direction, to regulate the flow of liquid and completely block the pipeline. The main function of this type of pipe fitting is locking. The regulation function is carried out with great restrictions, rather we can talk about throttling.
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