THROTTLE DEVICE EQUIPPED WITH PRESSURE RESTRICTION VALVE TO DAMP PRESSURE VIBRATION

PURPOSE: To damp pressure fluctuations by coaxially arranging the throttle opening part of a throttle body in the open hole of a easing. CONSTITUTION: A pressure medium discharged from a pump flows through an opening part 23 of a throttle 11 and in that case, a compression spring 28 holds a throttle body 21 equipped with an emboss part 22 thereof while abutting it to a valve seat 18 of a casing 14. Only when the throttle opening part 23 is closed by a foreign material erroneously contained in the pressure medium, the force generated by the pressure medium operating upon the emboss part 22 of the throttle body 21 located inside an open hole 17 moves up the throttle body 21 from the valve seat 18 against the bias of the compression spring 28. That is, a device 10 flows through the bypass of the throttle 11 by an opened pressure limiting valve 12 and in that case, the pressure medium traces a route along with the emboss part 22 toward an outflow side part or a route between tongue-shaped guide plates 24.