| 摘要 |
PURPOSE:To grasp the flow characteristic easily and to suppress the noise, by forming the inner chamber of a tubular valve plug skirt having the bottom and provided with many holes in the circumferential wall with uniform density into conical or a spindle. CONSTITUTION:The inner chamber 14a of the skirt 14 of a valve plug 15 is formed into a spindle having the diameter reducing from the opening toward the bottom, where many holes 16 having same diameter are made in the circumferential wall of said skirt 14 with uniform density. In such a low noise valve, the fluid flowed into the inner chamber 14a is reduced from the lower end opening toward the upper end section to increase the flow speed, but since the inner pressure is recovered due to the decrement of the fluid flowing out through said hole at each level, the flow speed is made approximately same across the entire flow area of the inner chamber 14a. |
