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The valve is used in mechanical engineering as a fixture for stopping and adjusting of different fluids such as steam, water, aggressive liquids, etc. It is convenient both for manual and automatic mode of operation. It ensures constant closing force, reliable and safe stopping of the fluid and facilities for fine adjustment of the dynamic processes. The valve consists of a casing (1) in which a seat bushing (2) of cylindrical inner surface is thread- mounted. An elastic seal (5) is mounted to the spindle (4) along the cylindrical generatrix of which grooves are machined. The elastic seal (5) has larger diameter than the internal diameter of the seat bushing (2).