德国伺服阀D661-4691C
阀的优点：
超大流量阀体流到设计，并可选择使用X和Y口进行先导级外控、外泄。减小了D662-D665的阀芯驱动面积，从而具有以下优点：改善了动态响应，使较小的先导级流量能驱动阀芯快速运动。
故障保险设计可使滑阀在短路，断电或者油源失压的情况下通过对中弹簧和做阀使主阀芯处于可未知的位置。
单级或二级先导阀控制。
功率级滑阀由单级或二级先导阀驱动。D660系列比例伺服阀有二级和三级构造两种形式。二级比例伺服阀组主要运用在小信号时要求具有较高分辨率和较高动态响应的场合中。我们的伺服比例控制阀结合了快速响应的先导级、合理的滑阀驱动面积和集成电路板的功能，该产品拥有佳控制性能。
常用型号有：
MOOG D633-303B
MOOG D633-308B
MOOG D633-313B
MOOG D633-317B
MOOG D633-471B
MOOG D633-472B
MOOG D633-473B
MOOG D633-481B
MOOG D633-525B
MOOG D634-538A
MOOG D661-393D
MOOG D661-4023
MOOG D661-4033
MOOG D661-4069
MOOG D661-4070
MOOG D661-4099
MOOG D661-4313C
MOOG D661-4332C
MOOG D661-4334C
MOOG D661-4438E
MOOG D661-4451C
MOOG D661-4507C
MOOG D661-4575C
MOOG D661-4576C
MOOG D661-4586E
MOOG D661-4594C
MOOG D661-4624
MOOG D661-4636
MOOG D661-4640
MOOG D661-4649
MOOG D661-465
MOOG D661-4651
MOOG D661-4652
MOOG D661-4691C
MOOG D661-4697C
MOOG D661-4729
MOOG D661-4773
MOOG D661-4776
MOOG D661-4782
MOOG D661-4790
MOOG D661-4826
MOOG D661-4867
MOOG D661-5611
MOOG D661-5625C
MOOG D662-1923E-4
MOOG D662-4010
MOOG D662-4014
MOOG D662-4036
MOOG D662-4037
MOOG D662-4038
MOOG D662-4065
MOOG D662-4083
MOOG D662-4099
MOOG D662-4723
MOOG D662-4846
MOOG D662-4884
MOOG D662Z1931E
MOOG D662Z4017
MOOG D662Z4336K
MOOG D662Z4341K
MOOG D662Z4378K
MOOG D662Z4380
MOOG D662Z4384K
MOOG D662Z4813
MOOG D662Z4814
MOOG D662Z4815
MOOG D663-1922E-4
MOOG D663-306K
MOOG D663-344K
MOOG D663-4007
MOOG D663-4012
MOOG D663-4025
MOOG D663-4318K
MOOG D663-4705
MOOG D663-4769
MOOG D663-5002
MOOG D663-5304K
MOOG D663Z4305K
MOOG D663Z4307K
MOOG D663Z4322K
MOOG D664-4009
MOOG D664-4013
MOOG D664-4311K
MOOG D664-4383K
MOOG D664-4384K
MOOG D664-4714
MOOG D664Z4306K
MOOG D664Z4382K
