FIELD: oil industry. SUBSTANCE: gear to seal head of oil well includes tubular head, table and side gate valves, tee-joint placed between them, separable throttle valve, plug having cylindrical location surfaces where separable throttle valve is put is positioned in cylindrical location hole of tee-joint. Plug has through hole uniaxial to vertical hole in tee-joint. It is fitted with lockpin entering groove in tee-joint with its free end. Plug is tightened up with the help of nut on side of plugged hole. EFFECT: simplified design of gear, reduced usage of metal and labor input to its manufacture, simplified process of replacement of throttle valve and decreased time for its replacement. 1 dwg
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