This invention relates to a floating conical plug valve comprising the valve body with a path for medium passing by, the conical valve chamber which is intersected into the said path perpendicularly,PLUG VALVES a conical valve core which can be turned, inserted in valve chamber, used for cutting off the said path in case of valve closed,Safety valves a valve stem for turning of the valve core and a spring fitted between the bottom of the valve core and the valve chamber, the valve cap is on the top of the valve body which characterized in that the said valve core features a floating conical plug valve core which can be moved up and down within the valve chamber, there is a rotational transmission sleeve on the top of the valve core,Check Valves with the torque limited sliding block and the torsion transmission pin outside of the valve stem, the rotational telescopic inner sleeve matched up and by screw thread is fitted between the rotational transmission sleeve and the valve stem, there is the telescopic outer sleeve outside of the telescopic inner sleeve, In this invention it only needs one handle turning in one direction that the valve core can firstly be lifted and turned by a certain angle and then pressed downwardly for sealing engagement; there are no seal film between the surfaces of conical valve chamber and valve core, no losses caused by friction and erosion, small worn out and simplification in structure.

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