PUMP

摘要

A pump (1) is provided with : a casing (30) which forms the outer shell of a suction flow passage (35a), of a pump chamber (131) which connects to the suction flow passage (35a), and of a discharge flow passage (36a) which connects to the pump chamber (131); and a volute section (130) which includes a volute flow passage connecting to both the suction flow passage (35a) and the discharge flow passage (36a) and which is formed in the pump chamber (131) as a part independent of the casing (30).