| 摘要 |
PURPOSE: A valve instrument is provided to stably operate an opening/closing action of a valve and to improve endurance by preventing an eccentric abrasion of an upper surface of a valve stem making contact with a locker arm. CONSTITUTION: A valve spring retainer(6) is fixed to an upper end of a valve stem(4) extending towards an upper portion of a valve. A plurality of slots(7) are formed at a lower surface(6a) of the valve spring retainer(6) at a predetermined interval. The slots(7) have an elongated hole shape. A rotating ball(8) is rotatably accommodated in the slots(7). A lower end of the rotating ball(8) downwardly extends beyond the lower surface(6a) of the valve spring retainer(6). A washer(10) having a function of a dish spring is provided at a lower portion of the valve spring retainer(6) in order to support the rotating ball(8).
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