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{"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.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"}}
{"title":"Moog Servo Valve with Radial Shaft Seal Mechanically Driven Pump and Cast Iron","imgUrl":"https:\/\/img.chinax.com\/nimg\/c1\/e4\/cbd8a4ce9cbfe75f4d004bb13dc3-200x200-1\/moog_servo_valve_with_radial_shaft_seal_mechanically_driven_pump_and_cast_iron_material_for_electro_hydraulic_proportional_control.jpg","attrs":{"Brand Name":"MOOG","Model Number":"D765-1089-4\/S63JOGAEVSXO D061-8412\/D663-4007J15HOBB4VB D661-G23\/JOAA6VSX2HA 072-559A\/S15FDFAVBL D663-4006\/L03HXBD6NSM2-0","Certifiion":"ISO","Place of Origin":"Germany"}}
A Moog electro-hydraulic servo valve is a high-precision component that converts electrical signals into hydraulic power output. It controls hydraulic flow and pressure to regulate position, speed, force, or pressure in systems like industrial machinery, aerospace actuators, and turbine controls. Its design typically includes a torque motor, nozzle-flapper pilot stage, and spool valve for accurate performance.
2. What are the key features?
High precision: Control accuracy up to ~0.1%
Fast dynamic response: Responds within milliseconds
Programmability: Customizable control algorithms via embedded electronics
Robustness: Operates in harsh environments (-20°C to 80°C) and resists contamination
Fail-safe function: Automatic shutdown during power loss or failure
3. What are common failure modes?
Torque motor issues:
Coil breakage (valve fails to respond)
Armature sticking or ball head wear (causing instability)
Nozzle/flapper blockages: Clogging from oil contamination reduces response and causes system oscillation
Spool amplifier problems:
Edge wear (increases leakage and noise)
Spool sticking due to contaminated or degraded oil
Seal aging: Leads to internal/external leakage
4. How to maintain servo valves?
Oil quality management: Use recommended fluids (e.g., phosphate ester fire-resistant oil) and maintain cleanliness per NAS 1638 Class 5 standards. Regularly check acidity and resistivity
Routine inspections: Test for electrical issues (e.g., coil resistance), clean filters, and check for loose components
Pre-startup checks: Ensure oil circulation before powering the valve to prevent clogging
5. How to troubleshoot unstable operation (e.g., cylinder drift or oscillation)?
Check servo valve resolution and zero zone stability
Inspect for internal leakage or spool wear
Verify control system parameters and calibrate zero bias if needed
6. What if the valve doesn't move?
Confirm electrical signals and coil connectivity
Check for spool sticking caused by debris in oil
Ensure correct startup sequence: oil flow before electrical power
7. Can Moog servo valves be customized?
Yes. Models like the D636/D637 series support fieldbus interfaces and programmable electronics for appliion-specific tuning.
8. What specifiions should I consider?
Operating pressure: Up to 350 bar
Flow rate: 5-100 L/min (at Δp 35 bar)
Voltage/current: Typically 220V, 1.5A
Mounting: Complies with ISO 4401 standards
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...
