Abstract: A mixer with a container and a cover mounted impeller and drive motor. A tiltable support for the container for decanting liquid and for emptying the container with and without the cover in position, and another support for lifting and lowering the cover. A mixer with provision for attaching a vacuum source to the container and for heating the cover to control condensation.

Abstract: A mixer for mixing material such as paint, plastics etc. using a grinding media and comprising a container with an agitator for producing the mixing action. An outlet for the mixed material is provided at the bottom of the container with a poppet valve for closing and opening the outlet. The valve permits emptying of the mixed material while retaining the grinding media in the container. The valve is cylindrical, sliding between a lowered closed position and a raised open position, with an apertured side wall, typically a metal screen. The valve may be rotated and/or lowered and raised during the emptying process freeing the screen of packed or settled material for complete emptying of mixed material.