| 摘要 |
PURPOSE: To lighten a pressure control valve by making it of aluminum, and also stably fix excellently in positioning accuracy an iron-made seat member to an aluminum-made spool. CONSTITUTION: A cylinder part 17c, having a diameter smaller than that of the slide part 17d of a spool, is formed on a spool 17 end part on a pressure chamber 5 side, and also a distortion buffering part 17e, having thickness thicker than that of the cylinder part 17c, is formed between the cylinder part 17c and the slide part 17d. Also, a seat member 18, wherein a caulking groove 19 is formed on an outer peripheral surface, is pressed in a valve hole 17a, and then the cylinder part 17c corresponding to the caulking groove 19 is caulked to be bitten into the caulking groove 19. |
