Flow regulating valve for hydraulic system - has actuator adjustment provided by stepping motor to rotate valve restrictor through angle to adjust restricting orifice and with electromagnetic brake to maintain position

摘要

The valve has a flow restricting element (620) that is moved through an arc to control the flow to an outlet (208). The element is coupled (622) to a spindle (654) that receives input from a stepping motor (640). The spindle of the motor is coupled to a bush (660) with a flange (662) and an axial ball bearing (664) provides low friction support. The bush has an extension with a stop (690) to limit movement. Coupled to the motor is an electromagnetic brake (642) that maintains the set valve position. ADVANTAGE - Improved adjustment accuracy over range.