{"product_id":"g761-3600b-moog-electrohydraulic-761-series-two-stage-servo-valve","title":"G761-3600B Moog Electrohydraulic 761 Series Two-Stage Servo Valve","description":"\n\u003ch3\u003e\u003cstrong\u003eG761-3600B | Moog 761 Series Two-Stage Electrohydraulic Servo Valve\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color:#1A73E8;\"\u003eMoog G761-3600B\u003c\/span\u003e\u003c\/strong\u003e belongs to the \u003cstrong\u003e\u003cspan style=\"color:#1A73E8;\"\u003e761 Series\u003c\/span\u003e\u003c\/strong\u003e of two-stage electrohydraulic flow control servo valves. It uses a mechanical feedback design and a nozzle-flapper pilot stage to regulate hydraulic flow in demanding motion-control systems.\u003c\/p\u003e\n\n\u003cp\u003eThe two-stage architecture combines a torque motor pilot stage with a hydraulically driven main spool. The pilot stage converts the electrical command into a hydraulic control signal. The main stage then meters flow to the actuator according to the spool position.\u003c\/p\u003e\n\n\u003cp\u003eThis arrangement supports high dynamic response, fine flow regulation, and low hysteresis. It suits hydraulic systems that require accurate actuator positioning, repeatable motion, and stable control under changing operating conditions.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e01 | Control Architecture: Electrical Command to Hydraulic Flow\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe 761 Series uses a symmetrical nozzle-flapper torque motor in its pilot stage. Mechanical feedback provides spool-position feedback within the valve's control mechanism.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirst stage – Pilot control:\u003c\/strong\u003e The torque motor moves the flapper and changes the pressure balance across the pilot stage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecond stage – Main spool:\u003c\/strong\u003e The pilot pressure drives the main spool to meter hydraulic flow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical feedback:\u003c\/strong\u003e The feedback mechanism helps balance spool movement against the electrical command.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow regulation:\u003c\/strong\u003e The main stage controls flow through the valve's metering edges.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe nozzle-flapper design provides high control dynamics and resolution. Its low-hysteresis characteristics support consistent response when the command signal changes direction.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e02 | Hydraulic Operating Window\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe 761 Series covers a broad range of rated flow configurations. Actual flow capacity depends on the selected valve configuration and the pressure drop across each spool land.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eHydraulic Parameter\u003c\/th\u003e\n\u003cth\u003eSeries Specification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated flow range\u003c\/td\u003e\n\u003ctd\u003e0.5–75 L\/min (0.125–20 gpm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard flow configurations\u003c\/td\u003e\n\u003ctd\u003e4, 10, 19, 38, 63 L\/min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard flow equivalents\u003c\/td\u003e\n\u003ctd\u003e1.1, 2.5, 5, 10, 16.5 gpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated pressure drop\u003c\/td\u003e\n\u003ctd\u003e35 bar (500 psi) per spool land\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum operating pressure – aluminium body\u003c\/td\u003e\n\u003ctd\u003e315 bar (4,500 psi)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum operating pressure – steel body\u003c\/td\u003e\n\u003ctd\u003e350 bar (5,000 psi)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValve function\u003c\/td\u003e\n\u003ctd\u003e3-way and preferably 4-way applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eSelection note:\u003c\/strong\u003e The maximum pressure depends on the valve body material. Do not apply the 350 bar steel-body rating to an aluminium-body configuration. Confirm the actual body material and pressure rating before specifying the valve for a high-pressure circuit.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e03 | Dynamic Response and Electrical Interface\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eServo valve response affects actuator tracking, positioning accuracy, and overall hydraulic system stability. The 761 Series provides a fast response range for dynamic control applications.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003ePerformance Item\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRated electrical signal\u003c\/td\u003e\n\u003ctd\u003e8–200 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e100% step response\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;4 to \u0026lt;16 ms, depending on configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl technology\u003c\/td\u003e\n\u003ctd\u003eTwo-stage mechanical feedback\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePilot stage\u003c\/td\u003e\n\u003ctd\u003eSymmetrical nozzle-flapper torque motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eThe published step-response range covers different 761 Series configurations. It should not be treated as a confirmed response time for every G761-3600B valve. Verify the exact configuration and performance curve when response time is a critical design requirement.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e04 | Mechanical Interface and Installation Envelope\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe compact valve design supports hydraulic installations where manifold space and mounting dimensions are important. The series uses a Size 04 mounting pattern.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting size:\u003c\/strong\u003e Size 04.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting pattern:\u003c\/strong\u003e ISO 10372-04-04-0-92.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries weight range:\u003c\/strong\u003e 1.0–1.7 kg (2.2–3.8 lbs).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation type:\u003c\/strong\u003e Hydraulic manifold mounting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eConfirm the mounting interface, port arrangement, seal compatibility, and valve body material before replacement. The published weight range applies to the series and does not establish the exact weight of every G761-3600B configuration.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e05 | Configuration Options for Application Requirements\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe 761 Series offers several configuration options for different hydraulic control requirements. Their availability must be confirmed against the specific valve order code.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOption\u003c\/th\u003e\n\u003cth\u003eEngineering Purpose\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh Null Bias\u003c\/td\u003e\n\u003ctd\u003eProvides an alternative null-bias configuration for specific control requirements.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnetic Null Adjust\u003c\/td\u003e\n\u003ctd\u003eAllows magnetic adjustment of the valve null setting.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVented Motor Cap\u003c\/td\u003e\n\u003ctd\u003eProvides a vented motor-cap arrangement.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecial BSA Fit\u003c\/td\u003e\n\u003ctd\u003eSupports a specified special BSA configuration.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallel Internal Wiring\u003c\/td\u003e\n\u003ctd\u003eProvides an alternative internal wiring arrangement.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReverse Polarity\u003c\/td\u003e\n\u003ctd\u003eOffers a reverse-polarity electrical configuration.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVery High Response\u003c\/td\u003e\n\u003ctd\u003eProvides an option for applications requiring higher response performance.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eThese options are not automatically included in every valve. Confirm the required configuration before ordering, especially when replacing a valve in an existing control loop.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e06 | Application Engineering and System Integration\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe 761 Series is designed for 3-way and preferably 4-way hydraulic applications. Its flow-control characteristics support systems that require controlled actuator movement and fast response to command changes.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial motion control:\u003c\/strong\u003e Regulates hydraulic flow to cylinders and motors in dynamic positioning systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest equipment:\u003c\/strong\u003e Supports controlled hydraulic movement in test rigs and simulation systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMobile and industrial machinery:\u003c\/strong\u003e Provides servo-level flow control where precise actuator response is required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProcess and power equipment:\u003c\/strong\u003e Supports hydraulic actuation systems that require repeatable movement and controlled flow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003e07 | Commissioning and Maintenance: Practical Checks\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eServo valve performance depends on more than the electrical command. Hydraulic cleanliness, supply pressure, return conditions, and mechanical installation all influence the control loop.\u003c\/p\u003e\n\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck hydraulic cleanliness:\u003c\/strong\u003e Inspect the filtration condition and fluid contamination level before installing the valve. Contamination can restrict pilot-stage passages and affect response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify pressure conditions:\u003c\/strong\u003e Confirm supply and return pressures against the valve's specified operating limits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInspect the mounting interface:\u003c\/strong\u003e Check manifold surfaces, port alignment, sealing elements, and fastener installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify the electrical command:\u003c\/strong\u003e Confirm that the control amplifier provides a compatible current signal within the specified 8–200 mA range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest the response:\u003c\/strong\u003e Apply controlled command changes and observe actuator movement, stability, and repeatability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecord baseline performance:\u003c\/strong\u003e Document null behavior, response characteristics, operating pressure, and system conditions for future maintenance comparison.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003e\u003cstrong\u003eField troubleshooting insight:\u003c\/strong\u003e If actuator movement becomes slow or unstable, avoid immediately adjusting the servo valve null. First compare the current condition with the original hydraulic pressure, filtration, and command-signal records. A restricted pilot passage, unstable supply pressure, or incorrect amplifier output can produce symptoms similar to a valve calibration problem.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e08 | Five Technical FAQs\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ1: Why does a two-stage servo valve use a pilot stage instead of driving the main spool directly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The pilot stage uses a relatively small electrical torque motor to control hydraulic pressure acting on the main spool. This arrangement provides the force needed to move the main metering element while retaining sensitive electrical control. It is useful in systems where the main spool must handle substantial hydraulic flow.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ2: What causes a servo valve to develop unstable actuator movement after a hydraulic system overhaul?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Air trapped in the hydraulic circuit, incorrect pressure settings, contamination, or changes in actuator loading can affect system stability. Check bleeding procedures, supply pressure, return-line conditions, and filtration before changing the control amplifier settings. Compare the system response with its previous commissioning records.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ3: How should engineers evaluate the rated flow when the operating pressure drop differs from 35 bar per spool land?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The published rated flow values use a reference pressure drop of 35 bar per spool land. Actual flow changes with the available pressure drop and hydraulic circuit conditions. Engineers should use the manufacturer's flow characteristics and system calculations rather than assuming the nominal rated flow remains constant at every operating pressure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ4: What should be investigated if the actuator drifts when the command signal is at null?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Check the electrical command offset, amplifier output, hydraulic load balance, and actuator leakage. Also inspect the valve's null condition and confirm that the correct null-bias configuration is installed. Avoid mechanical or magnetic null adjustment until external hydraulic and electrical causes have been ruled out.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ5: What information is needed to select a replacement for an installed 761 Series valve?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Record the complete model and order code, body material, rated flow, mounting pattern, electrical signal requirements, and any installed options. Also document the system's supply and return pressure conditions. Matching only the mounting size is insufficient because flow capacity, pressure rating, and electrical configuration can differ between valves.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e09 | Product Identification and Quotation Support\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Moog\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e G761-3600B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e 761 Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e Two-stage electrohydraulic flow control servo valve\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeedback design:\u003c\/strong\u003e Mechanical feedback\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePilot technology:\u003c\/strong\u003e Nozzle-flapper torque motor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated signal range:\u003c\/strong\u003e 8–200 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting pattern:\u003c\/strong\u003e Size 04, ISO 10372-04-04-0-92\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eGlobal PLC Spare HUB supports industrial automation and hydraulic control spare-part sourcing. Contact our team to confirm the G761-3600B configuration, availability, and quotation requirements.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWarranty:\u003c\/strong\u003e 12 months, subject to agreed supply terms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping options:\u003c\/strong\u003e DHL, FedEx, and UPS.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInquiry information:\u003c\/strong\u003e Please provide the complete model number, required quantity, and application details to help verify the correct configuration.\u003c\/p\u003e\n","brand":"Moog","offers":[{"title":"Default Title","offer_id":68006499582134,"sku":"G761-3600B","price":189.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/G761-3600B.jpg?v=1793948286","url":"https:\/\/www.plcsparehub.com\/products\/g761-3600b-moog-electrohydraulic-761-series-two-stage-servo-valve","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}