| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow channel opening/closing apparatus that can keep the instantaneous flow rate of supply water constant, quickly open and close a main valve for starting and stopping water supply, and be downsized.SOLUTION: A flush valve CV as the flow channel opening/closing apparatus incorporates constant flow rate means that operates to keep constant the main flow rate of a flow from a primary-side internal flow channel 20 to a secondary-side internal flow channel 30. The constant flow rate means has a constant flow rate valve body 44 having an inclined surface 441 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 with the inclined surface 441, and is formed as a valve member 40 including a main valve body 42 and the constant flow rate valve body 44 which are integrated.SELECTED DRAWING: Figure 2 |
