An improved butterfly valve for intercepting a conduit where substances flow, especially suitable for the pharmaceutical, alimentary and chemical fields The valve comprises an annular body integral with the conduit and acting as a support for the rotation stem of the butterfly valve dish , BUTTERFLY VALVESwhich is operable at one end by an actuating lever to open or close the internal port of the annular body  where a sealing member, tightly engaging with the butterfly valve dish in the closed position, is housed. Butterfly ValvesThe body comprises means for allowing an extremely quick and easy mounting and dismounting operations for cleaning purposes without affecting the sealing ability, operability and minimum flow resistance when the valve is fully open. The sealing member is shaped to require a low effort while closing the valve as well as assuring the seal even in correspondence of the stem of the butterfly valve dish. Butterfly ValvesThe latter comprises means for avoiding that pills trapped between it and the valve body are broken. The actuating lever allows the opening and the closing of the valve only after that a blocking system has been actuated by the operator preventing that unskilled people would operate the valve.

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