| 摘要 |
<p>A flow control valve (20) has a needle valve (76) for controlling flow between an inlet adapted to be connected to a source of pressure and an outlet adapted to be connected to an operating device whose operation is dependent upon the position of the needle valve; the needle valve is position by an armature (60) magnetically attracted by a solenoid coil (18); the armature is pressure equalized by two pins (72, 74) acting on the opposite ends (60a, 60b) of the armature and by a bypass tube (90) for supplying source pressure to each pin such that the control position of the valve is unaffected by changes in the pressure and is dependent solely upon the average current flow through the solenoid coil. <IMAGE></p> |
