| 摘要 |
PURPOSE: To prevent undesirable transitional vibration of a valve by providing a rotary cam allowing the motion amplitude of the valve to vary from its maximum value to its minimum value corresponding to angle positions of this cam about an eccentric rotation central axial in a direction perpendicular to the motion direction of the valve. CONSTITUTION: In a chamber A, an eccentric rotary cam 13 is immersed in a liquid and its fixed rotation central axis y is perpendicular to an axis x. The cam 13 is constructed in such a manner that at its one angle position, the cam 13 contacts a valve 10 over the whole length of its diameter, and at another angle position drifting 90 degree from the above-mentioned angle position when a peripheral portion of the valve is pressed in the axial direction to a washer 11, the cam 13 contacts the valve 10 only when the maximum amplitude of the valve is forced. The cam 13 is fixed to a rod 14 and is rotated by a rotating head 16. Further, a second restricted passage 18 parallel to a restricted passage 9 is forced in a rotary cylinder member 19 (valve element) and is fixed to the rod 14. Consequently, the rotation of the cam 13 and the rotation of the rotary cylinder member 19 are carried out simultaneously, thus realizing progressive adjustment. |
