伺服阀[SERVO VALVE]

伺服阀主要分为力反馈式电液伺服阀和位置反馈式伺服阀.

Servo valves consists of feedback - electric-hydraulic servo valve and position feedback servo valves.

电液伺服阀的任务,是把电气转换为液压量去控制油动机. 伺服阀是由一个力矩马达,两级液压放大和机械反馈系统.力矩马达是由一个两侧绕有线圈的永久磁铁组成,当伺服阀两侧的线圈产生不平衡电流时,由于电磁力的作用,使衔铁及挡板发生偏转,伺服阀把电量转成换成位移量,第一放大是由不1个双喷嘴和平共1 个挡板组成,此挡板固定在衔铁的中点,并在2个喷嘴之间穿过,使伺服阀在喷嘴的端部与挡板之间形成2个可变的节流孔,由挡板和喷嘴控制的油压通往第二级滑阀两两端面上.伺服阀第二级滑阀是四通滑阀结构上,并嵌入滑阀中心的1个槽内,当衔铁处于中间位置时,挡板对流过两个喷嘴的油流的节 作用相同,滑阀的两端无差压

electric-hydraulic servo valve's task is to the volume of electrical switch to control oil for hydraulic motivated. Servo valves is a torque motor, both hydraulic and mechanical enlarged feedback system. torque motors on both sides by a permanent magnet around a coil formed when servo valves on both sides of the coil produce an electric currency, as a result of electromagnetic power, and the back plate of the armature deflection, servo valves to be converted into electricity displacement volume, the first enlarged by one double nozzles peace were one back plate composition of the back plate is fixed at the mid-point of armature, and in between the two nozzles through to servo valves at the end of nozzles and a back plate between two variable costs Kong. by the back plate and nozzles controlled hydraulic slide-valve leading to the second level at two levels. servo valve secondary slide-valve is spun slide-valve structure, and embedded slide-valve inside the center one, when armature in the middle position, the back plate convection flow of oil had two nozzles with the same role, the two-piece valves.