The invention relates to a venturi tube - subassembly, which a venturi tube (20) and a shut-off element (30), wherein a gas outlet (23) via the shut-off element (30) is connected to the atmosphere, wherein the shut-off element (30) an for connection with the gas outlet (23) of the venturi tube (20) and the atmosphere gas serving space (32), a between a free outlet - and a blocking position actuatable shut-off unit (34) and a between a fully open position and a small amounts of position displaceable amounts control part (35), wherein the gas space (32) complete with the gas outlet (23) and the atmosphere is connected, if the amounts of control part (35) in the completely open position, so that the flow rate of the from the gas outlet (23) into the atmosphere discharged gas a full flow rate, wherein, when the amounts of control part (35) in the small amounts - position, the flow rate of the gas outlet (23) gas discharged into the atmosphere is a small flow rate, which is less than the full flow rate.
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