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{"title":"Moog Servo Valve with G3\/8 Outlet Port Lip Seal or Mechanical Seal and","imgUrl":"https:\/\/img.chinax.com\/nimg\/50\/47\/91e7c0493d909512781eaa3b0159-200x200-1\/moog_servo_valve_with_g3_2f8_outlet_port_lip_seal_or_mechanical_seal_and.jpg","attrs":{"Model Number":"D634-319C D634-341C D631-333C D661-556C D661-571C D661Z556C G761-3004 D661-4789 D072-559A G631-3005","Certifiion":"ISO","Place of Origin":"Germany","Minimum Order Quantity":"1"}}
{"title":"Moog Servo Valve with 3 Speed Settings 280 bar Pressure Rating and 24V 220V","imgUrl":"https:\/\/img.chinax.com\/nimg\/d2\/7d\/f3eda2d0981fc25c95d297b6b3e7-200x200-1\/moog_servo_valve_with_3_speed_settings_280_bar_pressure_rating_and_24v_220v_voltage_for_electro_hydraulic_control.jpg","attrs":{"Brand Name":"MOOG","Model Number":"743f002B G122-824-002 G122-829-001 G423-604-L25 G413-604A C08428-001 D661-5009 631F751F D122-034-017 743f003a","Certifiion":"ISO","Place of Origin":"German"}}
{"title":"Moog Servo Valve with 6-250m3 Drive Mode 3 Speed Settings and 25cm Nominal","imgUrl":"https:\/\/img.chinax.com\/nimg\/7a\/42\/3878b91428995093e193b3fb1725-200x200-1\/moog_servo_valve_with_6_250m3_drive_mode_3_speed_settings_and_25cm_nominal_diameter_for_electro_hydraulic_control.jpg","attrs":{"Brand Name":"MOOG","Model Number":"D633-495B D662-4356K D765-1089-5 D791-5045 D661-4033 CZ1006C3A D136-001-008 D137-001-011 D128-011-BA006 D791-5009","Certifiion":"ISO","Place of Origin":"Germany"}}
{"title":"Moog Servo Valve with Internal Meshing Principle and Online Video After Service","imgUrl":"https:\/\/img.chinax.com\/nimg\/d5\/f8\/94c6695c5edd5cda2a22cb5b5aec-200x200-1\/moog_servo_valve_with_internal_meshing_principle_and_online_video_after_service_for_1800_rpm_maximum_speed.jpg","attrs":{"Brand Name":"MOOG","Model Number":"D635-371E D691-087D D691-072D G761-3008 G761-3009-4 G761-3009 AC4598-24 D662-4087 D061-8311 d661-4444c","Certifiion":"ISO","Place of Origin":"Germany"}}
{"title":"Moog Servo Valve Electro-Hydraulic Servo Valve with 5.5 kg - 27 kg Weight 0.1 kW","imgUrl":"https:\/\/img.chinax.com\/nimg\/3c\/bf\/7924177fdbd7b891444770b8cd69-200x200-1\/moog_servo_valve_electro_hydraulic_servo_valve_with_5_5_kg_27_kg_weight_0_1_kw_power_and_water_usage.jpg","attrs":{"Brand Name":"MOOG","Model Number":"D635-671E D634-524A D691Z2086G D662-4002 D661-4010 D661-5626C D661-5628C D792-5012 D663-4008 B97069-061","Certifiion":"ISO","Place of Origin":"Germany"}}
{"title":"Moog Servo Valve Electro-Hydraulic Servo Valve with 290*180mm Size Up to 1000 cc","imgUrl":"https:\/\/img.chinax.com\/nimg\/9b\/db\/453db3b5c493145dd9358c4b6e29-200x200-1\/moog_servo_valve_electro_hydraulic_servo_valve_with_290_2a180mm_size_up_to_1000_cc_2frev_displacement_and_pressure_compensated_con.jpg","attrs":{"Brand Name":"MOOG","Model Number":"D061-8312 N122-001 D634-1035 D641-230 122-105 D631-294","Certifiion":"ISO","Place of Origin":"Germany"}}
{"title":"Moog Servo Valve Electro-Hydraulic Proportional Flow Control Valve with 25cm","imgUrl":"https:\/\/img.chinax.com\/nimg\/7e\/00\/b01c474ca71e6d6844c32e6b0d34-200x200-1\/moog_servo_valve_electro_hydraulic_proportional_flow_control_valve_with_25cm_nominal_diameter_low_noise_less_than_70_db_28a_29_and.jpg","attrs":{"Brand Name":"MOOG","Model Number":"J761-003\/S63JOGA4VPL D662-4015-D02HABF6VSX2B D691-2705D-Q60FTATCNEC2N D633-419AR16KO1AONSP2 D791-4007S25JQS6VSX2-B","Certifiion":"ISO","Place of Origin":"Germany"}}
MOOG servo valves are primarily used as actuators in electrical hydraulic servo systems. These systems benefit from hydraulic actuators that offer excellent speed control, high power-to-weight ratio, smooth transmission, and strong interference resistance. The servo valves are essential components in modern high-performance electro-hydraulic servo systems.
Frequently Asked Questions
Common Failure Issues
Torque Motor Issues:
Broken coils result in no current flow, preventing valve response
Contamination in air gap causes armature sticking
Loose fasteners or worn parts can increase null bias or instability
Nozzle/Flapper Stage Issues:
Clogged nozzles or orifices (often from oil contamination) reduce frequency response and cause instability
Spool Amplifier Stage Issues:
Spool sticking from contaminated oil or deformed spool causes distorted response
Cutting edge wear increases internal leakage and reduces stability
System-Level Symptoms
Cylinder refusal to move (often due to stuck servo valve)
Uncontrolled valve movement (sudden full opening/closing without command)
Cylinder oscillation ("hunting") from high internal leakage or instability
High cylinder lag
Maintenance Recommendations
Maintain clean, dry hydraulic fluid
Use high-quality filters and follow strict oil analysis/replacement schedule
Design hydraulic system to minimize contaminant accumulation
Perform regular inspections for leaks and performance changes
Detailed test reports provided with new/repaired valves
Technical support available through MOOG and authorized distributors
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter
Total Annual:
1 million-10 millon
Employee Number:
>50
Ecer Certification：
Verified Supplier
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha... Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha...
