Floating action type servo-valve

摘要

The present invention relates to a valve, and a floating action type servo-valve used for fluid control, including a valve body, a torque motor, a pilot stage and a power stage control mechanism. An upper valve block, an intermediate block and a lower valve block are stacked and fastened by a fastener in the valve body. A torsion-bar spring of the torque motor passes through the center of an armature and is fixed to the valve body with a stand. A pilot stage revolving shaft and a power stage revolving stage are provided in a same central line, with a mating between the pilot stage revolving shaft and the upper valve block and a mating between the power stage revolving shaft and the lower valve block. The servo valve includes a shifting enlargement mechanism constitute by a shifting fork and a shifting lever.

主权项

1. A floating action type servo-valve, comprising a valve body, a torque motor, and a pilot stage control mechanism and a power stage control mechanism provided in a cavity of the valve body, and an upper valve block, an intermediate block, a valve block stacked and fastened by a fastener in the valve body, wherein:
a torsion-bar spring of the torque motor passes through a center of an armature and fixed to the valve body with a supporting stand; a pilot stage revolving shaft and a power stage revolving shaft have a common axial, with a clearance fit between the pilot stage revolving shaft and the upper valve block and an interference fit or a clearance fit between the power stage revolving shaft and the lower valve block; the servo valve also comprises a shifting enlargement mechanism constituted by a shifting fork and a shifting lever, a rotation center of the shifting fork situating in an axis of the pilot stage revolving shaft and a rotation center of the shifting lever situating in an axis of the torsion-bar spring, one end of the shifting lever being connected to a lower end of the torsion-bar spring of the torque motor and the other end of the shifting lever being slidably connected to the shifting fork.