Valve unit with a housing

A valve unit comprising a housing, a fluidic valve drive which includes a fluid chamber and a piston which delimits the fluid chamber on one side and is adjustable by fluid in the fluid chamber and a valve spindle coupled to the piston, a closing body arranged at the end of the valve spindle opposite the valve drive, an elastic restoring element which exerts a force on the valve spindle along the spindle axis, and at least one manually actuatable lever which is provided on the outside of the valve drive for manually adjusting the valve spindle and which is adapted to be adjusted from an initial position to an actuating position via an intermediate position, wherein the at least one lever when in an intermediate position or in the actuating position exerts a force on the valve spindle along the spindle axis which counteracts the force of the elastic restoring element, and wherein the at least one lever when in the non-actuated state remains in the initial position and is moved from an intermediate position or the actuating position back to the initial position by the restoring element.