美国穆格MOOG伺服阀原装*
穆格伺服阀由永磁力矩马达、喷嘴、档板、阀芯、阀套和控制腔组成。当输入线圈通入电流 伺服阀时，档板向右移动，使右边喷嘴的节流作用加强，流量减少，右侧背压上升；同时使左边喷嘴节流作用减小，流量增加，左侧背压下降。阀芯两端的作用力失去平衡, 阀芯遂向左移动。高压油从S流向C2，送到负载。负载回油通过 C1流过回油口，进入油箱。阀芯的位移量与力矩马达的输入电流成正比，作用在阀芯上的液压力与弹簧力相平衡，因此在平衡状态下力矩马达的差动电流与阀芯的位移成正比。如果输入的电流反向，则流量也反向。表中是伺服阀的分类。
美国穆格MOOG伺服阀原装*
633-332B D633-333B D633-334B D633-336B D633-340B D633-341B D633-342B D633-344B D633-345B D633-346B D633-347B D633-348B D633-354B D633-357B D633-358B D633-359B D633-360B D633-361B D633-362B D633-363B D633-364B D633-365B D633-369B D633-370B D633-372B D633-374B D633-375B D633-380B D633-382B D633-386B D633-390B D633-391B D633-392B D633-394B D633-395B D633-396B D633-399B D633-410B D633-411B D633-412B D633-416B D633-417B D633-418B D633-419B D633-420B D633-423B D633-424B D633-427B D633-431B D633-432B D633-434B D633-438B D633-440B D633-441B D633-442B D633-445B D633-446B D633-447B D633-448B D633-453B D633-455B D633-456B D633-458B D633-460B D633-465B D633-471B D633-472B D633-473B D633-474B D633-481B D633-482B D633-483B D633-485B D633-487B D633-490B D633-491B D633-492B D633-493B D633-494B D633-495B D633-496B D633-497B D633-498B D633-499B D633-500B D633-501B D633-502B D633-503B D633-504B D633-507B D633-508B D633-509B D633-511B D633-512B D633-513B D633-514B D633-515B D633-516B D633-517B
D661-1912E；D661-1913E；D661-1915E-6；D661-1918E；D661-191D-5；D661-1924E；D661-1925E；D661-1926E；D661-1927E-4；D661-192D-5；D661-1931E；D661-1932E；D661-1933E-4；D661-1933E-6；D661-1937E-4；D661-1937E-6；D661-1940E；D661-1942E；D661-1943E；D661-1945E-4；D661-1945E-6；D661-1946E；D661-1954E；D661-1955E；D661-1957ED661-1960E；D661-1962E；D661-1963E；D661-1964E；D661-1965E；D661-1966E；D661-205A；D661-212D；D661-213C；D661-214D；D661-220A；D661-246A；D661-312A；D661-312A-4；D661-318B-5；D661-318D-4；D661-318D-5；D661-319D；D661-323D；D661-324D；D661-326D；D661-344A；D661-350A；D661-351A-4；D661-351A-5；D661-353B；D661-360D；D661-364B-5；D661-365A；D661-369D；D661-371D；D661-386A；D661-393D；D661-4008；D661-4009；D661-4010；D661-4011；D661-4012；D661-4013；D661-4014；D661-4015；D661-4019；D661-4020B；D661-4021；D661-4022；D661-4023；D661-4024；D661-4025；D661-4026；D661-4027；D661-4028；D661-4029；D661-4030；D661-4031；D661-4032B；D661-4033；D661-4034；D661-4035；D661-4036；D661-4038；D661-4039；D661-4040；D661-4041；D661-4042；D661-4043；D661-4044；D661-4045B；D661-4046；D661-4049；D661-4050；D661-4051；D661-4053；D661-4054；D661-4055；D661-4056B；D661-4057；D661-4058；D661-4059；D661-405D；D661-405D-4；D661-4060；d661-4061；D661-4062；D661-4064；D661-4065；D661-4066；D661-4067；D661-4068；D661-4069；D661-406D；D661-4070；D661-4071；D661-4072；D661-4073；D661-4074；D661-4075；D661-4076；D661-4077；D661-4078；D661-4079；D661-4080；D661-4081；D661-4082；D661-4083；D661-4084；D661-4085；D661-4086；D661-4088；D661-4089；D661-4090；D661-4091；D661-4096；D661-4097；D661-4098E；D661-4099；D661-4101；D661-4102；D661-4103；D661-4105；D661-4106E；D661-4107；D661-4108；D661-4109；D661-4110；D661-4111E；D661-4112；D661-4113；D661-4114；D661-4115；D661-4116E；D661-4117E；D661-4118E；D661-4119E；D661-411A；D661-4120；D661-4121E；D661-4122E；D661-4123E；D661-4124E；D661-4125E；D661-4126E；D661-4127；D661-4128；D661-4129；D661-4130；D661-4131；D661-4132；D661-4133；D661-4134；D661-4136B；D661-4137；D661-4142；D661-4144；D661-4145E；D661-4147；D661-4148；D661-4149；D661-4150；D661-4151B；D661-4152B；D661-4154；D661-4155B；D661-4156；D661-4157B；D661-4158B；D661-4159；D661-4160；D661-4165；D661-4166；D661-4167B；D661-4168；D661-4169；D661-416D；D661-4170；D661-4172

穆格MOOG公司是设计，制造和精密运动控制产品和系统集成商。主要产品MOOG阀，MOOG伺服阀、MOOG伺服电机、MOOG控制器、MOOG伺服驱动器，MOOG电液伺服阀，MOOG柱塞泵等产品。
MOOG伺服阀先导级采用了伺服射流管,降低了能耗,提高了阀的坚固性。由于伺服射流管先导级具有很高的无阻尼自然频率（500HZ）,因此此种阀的动态响应较高,并被广泛应用于塑料机械、压铸机、重工业等,并在实践中体现出的性能。
D634-1007 D634-1008 D634-1009 D634-1010 D634-1011 D634-1012 D634-1013 D634-1014 D634-1015 D634-1016 D634-1018 D634-1019 D634-1023 D634-1024 D634-1025 D634-1026 D634-1027 D634-1028 D634-1029 D634-1031 D634-1032 D634-1033 D634-1034 D634-1035 D634-1036 D634-1037 D634-1040 D634-1041 D634-1042 D634-1043 D634-1045 D634-1046 D634-1047 D634-1049 D634-1050 D634-1051 D634-1052 D634-1053 D634-1054 D634-1055 D634-1056 D634-1057 D634-1058 D634-1059 D634-1060 D634-3001 D634-301C D634-305C D634-307C D634-308C D634-317C D634-318C
美国MOOG穆格伺服阀主要用在电气液压伺服系统中作为执行元件（见液压伺服系统）。在伺服系统中，液压执行机构同电气及气动执行机构相比，具有快速性好、单位重量输出功率大、传动平稳、抗*力强等特点。