| 摘要 |
PURPOSE:To ensure the flow of a fluid in a flow passage by forming a flow regulating passage at the intermediate part of a fluid passage by a valve body and a valve hole as well as a hydrophilic property promoter layer at the wall surface part between the valve body and the valve hole forming the flow rate regulating passage. CONSTITUTION:A valve body 21 is rotated to place a cutout groove 28 in the state of facing a second fluid passage 18 as well as only a flow rate regulating passage 29 in the state of being communicated with the fluid passage 18. The heated water passing through the passage 29 is restricted to the minute flow, drips on a hot plate 32 and is injected onto coffee powder in a bucket from the transparent hole 33 of the hot plate 32. Even if the fluid passing through the passage 29 contains bubbles, the hydrophilic property at the wall part be tween the valve body 21 and a valve hole 19 forming the passage 29 becomes desirable due to a hydrophilic property promoter layer 30, and the bubbles are promoted to be detached from the wall surface of the passage 29. The flow rate regulating passage 29 is thereby prevented positively from being closed by the bubbles. |
