The shut-off valve is structurally designed as a valve, that is, its locking element moves parallel to the axis of the flow of the working medium. Like other types of stop valves, shut-off valves are used for complete closure of its cross-section, and therefore the flow of the working medium, that is, the locking element, which in the shut-off valve is most often a spool, in the process of operation is in the extreme positions of "open" or "closed". To regulate the flow rate of the medium by changing the passage cross-section successfully used control valves, there are also shut-off and control valves, combining these functions.
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