| 摘要 |
<p>PURPOSE:To utilize a boost control valve effectively by forming the pressure receiving face at the cylinder section small than that of a plunger thereby feeding the pressure oil of the plunger to the cylinder section and releasing an orifice when the oil is discharged. CONSTITUTION:A valve body 3 is provided with a primary side port 5 for feeding the pressure oil and a secondary side port 6 for discharging the pressure oil. A plunger 9 is fitted slidably to the cylinder section 7 while being energized toward the port 5 by means of a spring 10. The area of the pressure receiving face 11a at the cylinder section 11 is formed smaller than the area of the pressure receiving face 9a of the plunger 9, and a check valve 15 constructed to feed the pressure oil through the primary side port 5 to the cylinder section 7 is arranged in the plunger 9. When the oil is discharged, an operating section 15a moves an orifice hole 15c in the releasing direction while resisting against a spring 17 so as to discharge the pressure oil in the cylinder 11 smoothly.</p> |
