BATHTUB SYSTEM

PURPOSE:To prevent the gush of the initial cold water when the shoulder fall is started by removing the cold water remaining in a shoulder pipe by the negative pressure generated between a jet pipe and the shoulder pipe before the shoulder fall is started. CONSTITUTION:When a shoulder fall mode setting switch is operated from the jet mode state, a three-way valve 34a is switched, and a feed pipe 14 is communicated to a jet pipe 18 and a shoulder pipe 16. Air solenoid valves 38 and 39 are opened, and a circulating pump 10 and an air pump 20 are activated. The hot water in a bathtub 2 is sucked by the circulating pump 10 and fed to the jet pipe 18 and the shoulder pipe 16 via the three-way valve 34a. The hot water flowing into the shoulder pipe 16 gradually pushes the remaining cold water toward a shoulder fall nozzle 4a. On the other hand, the compressed air from the air pump 20 is fed to a jet nozzle via the solenoid valve 39, a suction pipe 24 has a negative pressure, thus the cold water remaining in the shoulder pipe 16 is fed to the jet nozzle 6.