MOOG电液伺服阀D634-319C使用说明
电液伺服阀由力矩马达和液压放大器组成。

　　力矩马达工作原理

　　磁铁把导磁体磁化成N、S极，形成磁场。衔铁和挡板固连由弹簧支撑位于导磁体的中间。挡板下端球头嵌放在滑阀中间凹槽内；线圈无电流时，力矩马达无力矩输出，挡板处于两喷嘴中间；当输入电流通过线圈使衔铁3左端被磁化为N极，右端为S极，衔铁逆时针偏转。弹簧管弯曲产生反力矩，使衔铁转过θ角。电流越大θ角就越大，力矩马达把输入电信号转换为力矩信号输出。

　　前置放大级工作原理

　　压力油经滤油器和节流孔流到滑阀左、右两端油腔和两喷嘴腔，由喷嘴喷出，经阀9中部流回油箱力矩马达无输出信号时，挡板不动，滑阀两端压力相等。当力矩马达有信号输出时，挡板偏转，两喷嘴与挡板之间的间隙不等，致使滑阀两端压力不等，推动阀芯移动。

　　功率放大级工作原理

　　MOOG电液伺服阀D634-319C使用说明
当前置放大级有压差信号使滑阀阀芯移动时，主油路被接通。滑阀位移后的开度正比于力矩马达的输入电流，即阀的输出流量和输入电流成正比；当输入电流反向时，输出流量也反向。滑阀移动的同时，挡板下端的小球亦随同移动，使挡板弹簧片产生弹性反力，阻止滑阀继续移动；挡板变形又使它在两喷嘴间的位移量减小，实现了反馈。当滑阀上的液压作用力和挡板弹性反力平衡时，滑阀便保持在这一开度上不再移

MOOG电液伺服阀D634-319C使用说明MOOG D661-4652/ 1156-421 G15JOAA6VSX2HA
    MOOG D661-4636/1156-421 G60KOAA5VSX2HA
    MOOG D661-4469C/1156-421 G75KOAA6VSX2HA
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    MOOG D663-4007/D061-8412 L03HABD6VSX2-A
    MOOG D634-341C R40K02M0NSS2
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    MOOG D633-333B R16KO1F0NSS
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    MOOG D061-8411/D662-4010 J15HOBA4VB1
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    MOOG D765-019-5 D765-1048-5 D765-1603-5 D791-5008
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    MOOG G631-3002B G631-3004B G631-3006B G761