PROBLEM TO BE SOLVED: To provide a pump unit capable of switching a state between a state in which liquid flows from a suction port side of a pump to a discharge port side and a state in which liquid flows in a direction opposite to the aforesaid direction without removing the pump unit from a line where the liquid flows.SOLUTION: A pump unit includes a pump having a suction port and a discharge port, a first flow channel (201) and a second flow channel (202), and also includes a circuit that can be switched between a forward flow state in which the first flow channel (201) is connected to the suction port and the second flow channel (202) is connected to the discharge port, and a backward flow state in which the first flow channel (201) is connected to the discharge port and the second flow channel (202) is connected to the suction port.SELECTED DRAWING: Figure 7COPYRIGHT: (C)2019,JPO&INPIT【課題】液体が流れるラインから取り外すことなく、ポンプの吸込口側から吐出口側に向かって液体が流れる状態と、この状態とは逆向きに液体が流れる状態と、に切り替えることが可能なポンプユニットを提供すること。【解決手段】ポンプユニットであって、吸込口及び吐出口を有するポンプと、第1流路(201)及び第2流路(202)を有するとともに、第1流路(201)が吸込口につながるとともに第2流路(202)が吐出口につながる順流状態と、第1流路(201)が吐出口につながるとともに第2流路(202)が吸込口につながる逆流状態と、を切り替え可能な回路と、を備えること。【選択図】図7
