| 摘要 |
PROBLEM TO BE SOLVED: To inhibit a hardened layer from cracking by equalizing surface pressure loaded on a seal part when a valve is closed and by preventing a contact at one side.SOLUTION: In a valve 1 provided with a valving element 5 and a valve seat 3 inside a valve box 2, a soft layer and a hardened layer are sequentially provided on a slide face of the valve seat 3 with the valving element 5 toward the slide face direction to equalize surface pressure load acted on the slide face of the valve seat 3. The hardened layer is fixed to the valve seat 3 by means of cure adhesion or the like via the soft layer. |
