Throttle drive for draining e.g. rainwater collection tank, comprises piston connected via rotary bearing to counterweight

摘要

The drive has at least one piston (5) connected to at least one counterweight (3) via a rotary bearing (1) so that an increase in water pressure in the axial direction of the piston causes the counterweight to rise. A reduction in this pressure causes this piston to return towards its original position.