Abstract: To provide a flow channel opening/closing apparatus that can keep the instantaneous flow rate of supply water, quickly open and close a main valve for starting and stopping water supply and be downsized. A flush valve CV, which is such a flow channel opening/closing apparatus, incorporates constant flow rate keeping part that operates to keep constant the main flow rate of water flowing from a primary-side internal flow channel 20 to a secondary-side internal flow channel 30, and the constant flow rate keeping part has a constant flow rate valve body 44 and a constant flow rate valve seat, operates to adjust the distance between the constant flow rate valve body 44 and the constant flow rate valve seat, and is configured as an integral valve member including a main valve body 42 and the constant flow rate valve body 44.

Abstract: To provide a flow channel opening/closing apparatus that can keep the instantaneous flow rate of supply water, quickly open and close a main valve for starting and stopping water supply and be downsized. A flush valve CV, which is such a flow channel opening/closing apparatus, incorporates constant flow rate keeping part that operates to keep constant the main flow rate of water flowing from a primary-side internal flow channel 20 to a secondary-side internal flow channel 30, and the constant flow rate keeping part has a constant flow rate valve body 44 and a constant flow rate valve seat, operates to adjust the distance between the constant flow rate valve body 44 and the constant flow rate valve seat, and is configured as an integral valve member including a main valve body 42 and the constant flow rate valve body 44.

Abstract: A shower apparatus includes: a shower unit operable for swinging and sprinkling water while swinging; a driving unit configured to generate driving force which is used for the swing of the shower unit by water; a shower channel configured to guide water to the shower unit via the driving unit; a power transmission unit configured to couple the driving unit with the shower unit and transmit the driving force generated by the driving unit to the shower unit; and a swing stop mechanism operable to stop the swinging of the shower unit. The shower unit sprinkles the water that is used for generating the driving force at the driving unit. The swing stop mechanism is configured to stop the swinging of the shower unit while keeping sprinkling water from the shower unit. The sprinkling flow rate from the shower unit before stopping the swinging is equal to the sprinkling flow rate from the shower unit after stopping the swinging.