| 摘要 |
PROBLEM TO BE SOLVED: To provide a reducing agent supply device capable of preventing a liquid reducing agent recovered in a storage tank from flowing backward into a pump after recovering the liquid reducing agent.SOLUTION: In a reducing agent supply device constituted such that control in which a liquid reducing agent is pumped to a reducing agent spraying side by a pump when operating an internal combustion engine, the liquid reducing agent is recovered to a storage tank by the pump when stopping the internal combustion engine, is executed, an aperture part where a flowing channel area is reduced is arranged in the middle of a return channel, a valve part constituted so as to shut off the return channel with the lowering of a pressure in a reducing agent supply channel and the return channel during recovering control of the liquid reducing agent and so as to open the return channel after the completion of the recovering control of the liquid reducing agent is arranged in the reducing agent supply channel side more than the aperture part. |
