Rotating composting drum has air holes, fitted with valve plate assemblies, which are opened and closed as wheels ride against an external ramp to push the plate open and return springs close the plate after the ramp

System to give a controlled opening/closing action to the air hole of a rotating drum (1) has a plate forming a valve (12) which is moved between a closed position where it seals the air hole (18) and an open position, is new. System to give a controlled opening/closing action to the air hole of a r...

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