| 摘要 |
PURPOSE:To obtain sure sealing effect even if counter flow pressure is small by forming a Y-letter type notch on one end of a flow path with the diameter of its flow-out port for preventing counter flow shortened in tapered shaped and forming a tapered pressure receiving face on the outer periphery. CONSTITUTION:A flow-in port 3 of fluid is provided on one end of a flow path 2 formed by soft elastic material and provided in the axial direction of the center, and a Y-letter notch is formed on the other end of the flow path 2 by shortening in a tapered shape the diameter of a flow-out port 6 for preventing counter flow. And a tapered pressure receiving face 10 is formed between Y-letter type projections on a Y-letter type outer peripheral portion. Then, when fluid flows out, the flow-out port 6 is opened in almost circular shape. When the fluid flows from the flow out port in reverse direction, this counter flow pressure is received by the tapered pressure receiving face 10, then the flow-out port 6 is subjected to a pressing force in the closing direction and counter flow can be prevented. |
