| 摘要 |
<p>PURPOSE:To reduce the generation of noise of fluid between a rotor and the fluid passage of a valve sleeve when the rotor and the fluid passage are interconnected and disconnected and to stabilize the flow of the fluid, by a method wherein an uneven surface is formed in the open edge of a recessed groove in the valve sleeve. CONSTITUTION:A fluid noise preventing part 40 formed with a number of concavities and convexities is formed to the open edge of a recessed groove 33 in a valve sleeve 21. Thus, when the fluid passage of a rotor 22 is joined with or disconnected from the fluid passage of the valve sleeve 21, the flow noise of fluid generated between the rotor 22 and the valve sleeve 21 is extremely reduced, and the flow of the fluid can be stabilized.</p> |
