G761 Series Servo Valves
Contents
1. 120 2 E BD k LIT uU Z 100 Bos ie a 2 E T S 4 E 80 ET NY A ani bd a e 9 60 E z 34096 T M 1 1 2 100 ae 60 a 40 vo 20 4 20 U 0 0 amp 0 3 6 9 12 15 10 100 1000 Time ms Frequency Hz Full Amplitude Step Response High Frequency Response 10096 step 4 10 19 l min 1 2 5 5 gpm 4 10 19 l min 1 2 5 5 gpm 120 CEP E 0 IE x 100 S 2 m M ki dg 4 M A a A 2 w S 3 6 CENS 120 R E x amp t 100 v 60 E 8 z je Es n Le a 5 10 40 M V 80 7 Gr an selene 100 l J 8 z E 60 8 y amp a 40 oo 20 p 5 20 amp ZEE o 0 0a 0 3 6 9 12 15 10 100 1000 Frequency Hz Full Amplitude Step Response Time ms High Frequency Response 100 step 38 l min 10 gpm 38 l min 10 gpm 120 a t2 oO 7 F U w 100 E E E 2 m ts 5 80 g 4 E E 6 T NE 120 a 40 Pe 100 60 598 100 y 10 s EH a H x 80 2 bs a eo Aj gt 2 20 o Es 40 Li N 20 i 0 0 amp 0 5 10 15 20 25 10 100 1000 i Time ms Frequency Hz Full Amplitude Step Response Sta2. 128 0 064 0 064 200 100 200 22 0 88 0 44 0 44 Ordering code Coil Inductance H Measured at 50 Hz Single coil Series coil Parallel coil H 0 72 2 2 0 59 L 0 22 0 66 0 18 Z 0 07 0 21 0 06 Coil connections A 4 pin electrical connector that mates with an MS3106F14S 2S is standard All 4 torque motor leads are available at the connector so that external connections can be made for series parallel or differential operation G761 761 Series Servo Valves can be supplied on special order with other connectors or pigtail Configuration for valve opening P gt B A gt T Series Parallel A B or C D A D B and C connected A and C B and D Rev H January 2014 8 TECHNICAL DATA Moog G761 761 Series Flow Control Servo Valves INSTALLATION DRAWINGS AND NULL ADJUST INSTRUCTIONS PIND PINA PINB oU 3 UN EH Fluid A Typical wiring schematic Location pin refer to section Hole Pattern for position Filter location 4X 8 36 0 329 thru L 1 13 49 0 531 to depth shown Mounting Holes Mechanical Null Adjust screw requires 3 8 wrench and 3 32 hex key Optional Magnetic Null Adjust requires 7 8 wrench Connector mates with MS3106F14S 2S Moog P N 49054F014S002S t 34 092 101 Industrial type petroleum base hydraulic fluid maintained to ISO 4406 Code 16 14 11 recom
3. Control Servo Valves ABOUT MOOG Moog Inc is a worldwide designer manufacturer and integrator of precision control components and systems Moog s Industrial Group designs and manufactures high performance motion control solutions combining electric hydraulic and hybrid technologies with expert consultative support in a range of applications including energy production and generation machinery industrial production machinery and simulation and test equipment We help performance driven companies design and develop their next generation machines Moog maintains facilities in 26 countries around the globe Servo Valves This vast scope ensures that our engineers remain close to the needs of machine builders and provide flexible design solutions and technical expertise tailored to our customers toughest challenges Moog experts work in close collaboration with machine builders and application engineers to design motion control systems for greater productivity higher reliability superior connectivity less costly maintenance and more effective operations Our regional presence industry knowledge and design flexibility ensures Moog motion control solutions are tailored to their environment from meeting operating regulations and performance standards to taking machine performance to a higher level Active Cartridge Valves Products At the heart of every Moog solution is an array of products engineered for precision high
4. performance and reliability For more than six decades Moog products have been specified for critical machine applications Some are developed specifically for unique operating environments Others are standard equipment on Radial Piston Pumps machines across many industries All are continuously improved to take advantage of the latest technology breakthroughs and advancements Moog products include Servo Valves and Proportional Valves Servo Motors and Servo Drives Servo Controllers and Software Radial Piston Pumps e Actuators s e Integrated Hydraulic Manifold Systems and Cartridge Valves Slip Rings Servo Drives Motion Bases Rev H January 2014 15 BACKGROUND Moog G761 761 Series Flow Control Servo Valves ABOUT MOOG Hydraulic solutions Since Bill Moog invented the first commercially viable servo valve in 1951 Moog has set the standard for world class hydraulic technology Today Moog products are used in a variety of applications providing high power enhanced productivity and ever better performance for some of the world s most demanding applications Electric solutions Clean operation low noise generation less maintenance and reduced power consumption make Moog electric solutions ideal for applications Flight Simulation worldwide Moog is the ideal partner for applications where transitioning technologies requires special expertise Hybrid solutions By incorporatin
5. the armature and flapper This assembly pivots about the flexure tube and increases the size of one nozzle orifice and decreases the size of the other The differential pressure created by this action causes spool motion The resulting spool displacement induces a linear force in the feedback wire which opposes the original input signal torque Spool movement continues until the feedback wire force equals the input signal force Magnet not shown Upper Polepiece Connector Armature Lower Polepiece Flexure Tube Feedback Wire Bushing b4 M Flapper Nozzles Spool ow S at S 5 1 i 1 1 E Inlet Orifice P B T A X Pilot Stage Filter Rev H January 2014 TECHNICAL DATA Moog G761 761 Series Flow Control Servo Valves G761 761 SERIES SERVO VALVES General Technical Data Valve design 2 stage with spool and busing and dry torque motor Pilot stage Nozzle Flapper Mounting pattern ISO 10372 04 04 0 92 Installation position Any orientation fixed or movable Weight 1 08 kg 2 4 Ib Storage temperature range 40 to 60 C 40 to 140 F Ambient temperature range 40 to 135 C 40 to 275 F Vibration resistance 30 g 3 axis 10 Hz to 2 kHz Shock resistance 30 g 3 axis Seal material Fluorocarbon FKM 85 SHORE D Other
6. 40 G761 3004B 38JOGM4VPL 38 10 0 40 G761 3005B S63JOGM4VPL 63 I5 40 Rev H January 2014 18 TAKE A CLOSERLOOK Moog solutions are only a click away Visit our worldwide website for more information and the Moog facility nearest you Argentina 5411 43265916 info argentina moog com Australia 61 3 9561 6044 info australia moog com Brazil 55 11 35720400 info brazil moog com Canada 1 716 652 2000 info canada moog com China 86 21 2893 1600 info china moog com Finland 358 10 422 1840 info finland moog com France 33 1 4560 7000 info france moog com Germany 49 7031 6220 info germany moog com Hong Kong 852 2 635 3200 India 91 80 4057 6666 info india moog com Ireland 353 21 451 9000 info ireland moog com Italy 39 0332421111 info italyY moog com Japan 81 46 355 3767 info japan moog com Korea 82 31 7646711 info korea moog com Luxembourg 352 40 46 401 info luxembourg moog com The Netherlands 31 252 462 000 info thenetherlands moog com Norway 47 6494 1948 info norway moog com Russia 7 8317131811 Singapore 65 677 36238 info singapore moog com South Africa 27 12 653 6768 info southafrica moog com Spain 34 902 133 240 info spain moog com Sweden 46 31 680 060 info sweden moog com Switzerland 41 713945010 info switzerland moog com Turkey 90 216 663 6020 info turkey moog com United Kingdom 44 0 1684 858000 info u
7. 7 8 9 10 G761 761 Optional feature Series specification 10 Signals for 100 spool stroke H 7 5 mA series Model designation L 20 mA series Assigned at the factory Z t 100 mA series Factory Identification Revision Level 9 Valve connector P Connector over P side l Valve version B Connector over B side S Standard response 63 l min 16 5 gpm H High response 4 l min 1 gpm 38 l min 10 gpm 8 Seal material V Fluorocarbon FKM 85 Shore D 2 Ratedflow in l min gpm For Apy 35 bar 500 psi per spool land 7 Pilot connections 04 4 0 1 0 4 Internal 10 10 2 5 5 Exernal 19 19 5 0 38 38 10 0 6 Spool position without electrical signal 63 63 16 5 M Mid position 3 Maximum operating pressure in bar psi and body material 5 Pilot stage design F Low flow nozzle flapper lt 10 l min J 315 4 500 aluminum G High flow nozzle flapper gt 10 l min i Bushing spool design 4 way axis cut linear D 4 way 10 overlap linear Preferred Models Model Number Type Designation Rated Flow A1 000 psi Rated Current single coil lpm gpm mA G761 3001B H04JOFMAVPL 4 1 0 40 G761 3002B 1OJOFM4VPL 10 2 5 40 G761 3003B H19JOGM4VPL IS 5 0
8. 94 in and an average finish Ra better than 0 8 um 0 000032 in 2 Ports For maximum flow the ports P T A and B must be designed with diameters of 8 2 mm 0 320 in port X with diameter of 5 0 mm 0 20 in 3 Recommended Seals 85 durometer 1 78 mm 0 070 in cross section 10 82 mm 0 426 in inside diameter O ring for P T A and B ports compatible with the hydraulic fluid Port X 85 durometer 1 78 mm 0 070 in cross section 9 25 mm 0 364 in ID O ring compatible with the hydraulic fluid Conversion Instruction For operation with internal or external pilot connection Pilot flow supply Screw and seal washer location M4 X 6 DIN EN ISO 4762 X P Internal P closed open External X open closed Rev H January 2014 10 BACKGROUND Moog G761 761 Series Flow Control Servo Valves NULL FLOW ADJUSTMENT It is often desirable to adjust the null flow of a servo Magnetic Adjustment Procedure valve independently of other system parameters Valves with mechanical null adjustment allow for at least 10 adjustment of null flow The mechanical null adjustment is an eccentric bushing retainer pin located above the tank port designation on the valve body which if rotated provides control of the bushing location Mechanical feedback elements position the spool relative to the valve body for a given input signal Therefore a movement of the bushing relative to the body changes the null flow If so equipped the magnetic null adju
9. EE Q rated flow Seine 052 S Ap actual pressure drop per spool land 10 Ap rated pressure drop per spool land 9 zo GH Ge 19 5 S O A NS Gl oy 8 2 5 yo AB a gt jer G 4 1 A 2 0 5 14 28 42 70 140 210 310 200 400 600 1 000 2000 3 000 4 500 Ap bar psi NULL CUT OPTIONS Standard Axis Cut Open Center Spool Valves Closed Center Spool Valves E Q z Q E Q I Underlap Overlap Zone Zone Input Current Input Current Input Current Default without request for Normally used in hydraulic motor Normally used in failsafe optional cuts applications applications Rev H January 2014 12 BACKGROUND RELATED PRODUCTS Din Rail Modules Analog Control Cards Moog s DIN rail mounted module analog control cards are ideal for use in enclosures where space is limited Modules include servoamplifers transducer conditioning electronics command and auxiliary function modules valve drive amplifiers and power supplies All of these modules are CE marked and require a 24V DC supply The modules mount to standard 35mm DIN rail mount for easy installation and removal Portable Valve Testers Evaluates Valves in the Field Valve testers are a cost effective method for evaluating valves in the field They provide a quick and easy means of differentiating between hydraulic and electronic problems There are five models to choose from each with different levels of capability and flexibility to meet your specific requir
10. L R 83248 size 007 2 pieces O ring 13 mm 0 512 in inside diameter x 1 5 mm 0 059 in cross section 1 piece filter disc 60 um Part designation Description Material Part number Base O ring for P T A 4required for P T A and B ports 10 82 mm Fluorocarbon FKM 85 shore 42082 022 and B ports 0 426 in inside diameter x 1 78 mm 0 070 in cross section Equivalent MIL R 83248 size 013 X port O ring 1 required for the X port 9 25 0 364 in x Fluorocarbon FKM 85 shore 42082 013 1 8 mm 0 070 in cross section Equivalent MIL R 83248 size 012 Replaceable filter 60 mp nominal A67999 065 Filter replacement kit Contains the following Fluorocarbon FKM 85 shore B52555RK201K001 Documents not included in scope of delivery Part designation Description Remark Part number Catalog Note Visit www moog com industrial li to download document G761 761 series general information CDL 6642 terature Service manual Note Visit www moog com industrial li to download document G761 761 standard series CDS 6673 terature Service manual Note Visit www moog com industrial li to download document G761 761 intrinsically safe K series CDS 6769 terature Rev H January 2014 17 ORDERING INFORMATION Moog G761 761 Series Flow Control Servo Valves ORDERING CODE Model number assigned at the factory Type designation 1 2 3 4 5 6
11. SERVO VALVES PILOT OPERATED FLOW CONTROL VALVE WITH ANALOG INTERFACE G761 761 SERIES SIZE 04 HIGH PERFORMANCE TWO STAGE DESIGN PROVIDING FLOW CONTROL IN A SIMPLE RUGGED DEPENDABLE LONG LIFE DESIGN WHAT MOVES YOUR WORLD INTRODUCTION Moog G761 761 Series Flow Control Servo Valves Whenever the highest levels of motion control performance and design flexibility are required you ll find Moog expertise at work Through collaboration creativity and world class technological solutions we help you overcome your toughest engineering obstacles Enhance your machine s performance And help take your thinking further than you ever thought possible TABLE OF CONTENTS INTRODUCTION Product Overview 3 Features and Benefits 4 Description of Operation 5 TECHNICAL DATA Performance Characteristics 6 Dynamic Characteristics 7 Electrical Data 8 Installation Drawings and Null Adjust Instructions 9 Hole Pattern for Mounting Surface 10 BACKGROUND Null Flow Adjustment 11 Flow Calculation and Null Cut Options 12 Related Products 13 Routine Maintenance Guidelines 14 About Moog 15 ORDERING INFORMATION Accessories and Spare Parts 17 Ordering Code 18 This catalog is for users with technical knowledge To ensure all necessary characteristics for function and safety of the system the user has to check the suitability of the products described herein The products described herein are subject to change without notice In case of doubt pl
12. ease contact Moog Moog is a registered trademark of Moog Inc and its subsidiaries All trademarks as indicated herein are the property of Moog Inc and its subsidiaries For the full disclaimer refer to www moog com literature disclaimers For the most current information visit www moog com industrial or contact your local Moog office Rev H January 2014 2 INTRODUCTION Moog G761 761 Series Flow Control Servo Valves PRODUCT OVERVIEW The G761 761 Series flow control servovalves are throttle valves for 3 and preferably 4 way applications They are a high performance 2 stage design that covers the range of rated flows from 4 to 63 l min 1 to 16 5 gpm at 35 bar 500 psi valve pressure drop per spool land The output stage is a closed center four way sliding spool The pilot stage is a symmetrical double nozzle and flapper driven by a double air gap dry torque motor Mechanical feedback of spool position is provided by a cantilever spring The valve design is simple and rugged for dependable long life operation The design is simple and rugged for dependable long life operation The output stage is a closed center 4 way sliding spool The pilot stage is comprised of a symmetrical double nozzle dry torque motor The 2nd stage spool position is controlled by a carbide tipped feedback wire The carbide ball on the end of the feedback wire is a mandatory design requirement that ensures high accuracy reliable operation and lo
13. ements All valve testers have a compact easily portable design Mounting Manifolds Easier Installation and Maintenance Various mounting manifolds are available for standard industrial valves including base and adapter types for mounting and flushing requirements Other hardware such as bolts and connectors are also available The specific accessories you may need for a particular model are listed in the relevant product catalogs and can be ordered through your local office Filtration Oil Filtration Requirements for Industrial Servo Systems The most effective way to reduce life cycle costs of an oil hydraulic system regardless of the types of valve used is through close attention to contamination control For industrial servo systems the ideal system filter arrangement is summarized as follows e Usea 10 micron Beta 10 75 high pressure filter without by pass just before the valve or critical parts of the valve e g pilot Usea3micron Beta 3 75 low pressure filter in the return or bypass line Useafilter in the tank breather that is at least the same filtration level as the finest filter in the system This recommendation is based on the fact that most servo and proportional valves can accept the odd particle up to 25 microns so the pressure filter will protect the valve from catastrophic failure The real work is done by the low pressure filter reducing the small particle contamination which is the prime c
14. end the following ambient conditions for storage Dust free moderately ventilated e As vibration free and shock free as possible Shock resistance as per EN 60068 2 27 50 g 6 directions half sine 3 ms Vibration resistance as per EN 60068 2 6 30 g 3 axes frequency 10 to 2 000 Hz Temperature Recommended 15 to 25 C 59 to 77 F Permissible 40 to 60 C 40 to 140 F Temperature fluctuations gt 10 C 50 F must be avoided Distance to shielded radiators gt 1 m 3 ft No direct exposure to sunlight No sources of light with a high UV content UV rays generate ozone which damage sealing materials Relative air humidity lt 65 non condensing AFTER STORAGE We recommend to check the original packaging valve spare parts and accessories for possible damage or alterations due to storage that is before use Damaged or not functional valves spare parts and accessories must not be started up Sealing materials with the following characteristics must not be used Contamination Cracking Hardening softening Stickiness Discoloration Storage Time 5 Years We recommend that the valve be checked by us or one of our authorized service centers after a storage time of more than 5 years Storage Time 10 Years After a storage time of more than 10 years the valves have to be checked by us or one of our authorized service centers BACKGROUND Moog G761 761 Series Flow
15. g the advantages of existing hydraulic and electric technologies including modular flexibility increased efficiency and cleanliness into innovative hybrid solutions Moog offers new performance potential in specialized applications Formula One Simulation Table Moog Global Support Flexible programs tailored to your needs such as upgrades preventative maintenance and annual multi year contracts Moog Global Support is our promise to offer world class Repair and Maintenance Services delivered expertly by our trained technicians With the reliability only available from a leading manufacturer with facilities around the world e On site services bring the expertise to you providing Moog offers you service and expertise you can count on to quicker commissioning set up and diagnostics keep your equipment operating as it should e Access to reliable services that are guaranteed to offer consistent quality anywhere in the world This promise offers many benefits to our customers For more information on Moog Global Support including visit www moog com industrial service Reduce your downtime by keeping critical machines running in peak performance Protect your investment by ensuring reliability versatility and long life Ae MOOG e Better plan your maintenance activities and make G LO BAL systematic upgrades SUPPORT e Leverage our flexible programs to meet the unique service requirements of your facility Look to Mo
16. k moog com USA 1716 652 2000 info usa moog com info hongkong moog com info russia moog com www moog com industrial Moog is a registered trademark of Moog Inc All trademarks as indicated herein are the property of Moog Inc and its subsidiaries 2013 Moog Inc All rights reserved G761 761 Series Flow Control Servo Valves TJW Rev H January 2014 Id CDL6642 en MOOG WHAT MOVES YOUR WORLD
17. mended For longer life 15 13 10 Viscosity 10 to 97 mm s cSt at 38 C 60 to 450 SUS at 100 F Operating Temperature Range mn alve Phasing Rev H January 2014 A V Flow out port B results when S P S uid 40 to 60 C 40 to 140 F mbient 40 to 135 C 40 to 275 F eries coils B amp C connected A D arallel coils A C B D ingle coils A B or C D ke 81 319 65 07 2 562 22 22 875 a 44 45 s 1 750 Si 93 i i 3 68 Y Surface Surface finish 0 8 um 0 000032 in flat within 0 025mm 0 001 in TIR Null Adjust Flow out port B results with the clockwise rotation of the null adjust screw 9 TECHNICAL DATA Moog G761 761 Series Flow Control Servo Valves G761 761 SERIES HOLE PATTERN FOR MOUNTING SURFACE Designation P A B T X G F1 F2 F3 F4 Size mm 8 15 8 15 SSE 8115 5 00 3 45 M8 M8 M8 M8 in sr O22 O22 esu 0197 0136 SIGS 51616 EACZIEJE AGZIE Position X mm 22 23 1111 33 34 2223 3332 1232 0 44 45 44 45 0 in 0 875 0 438 1313 0 875 1 312 0485 0 1 750 1 750 0 Position Y mm 21 42 3254 3254 43 64 874 19 84 0 0 65 07 65 07 in 0 844 128l LZS 1 718 0 344 0 781 O 0 2 562 2 562 Notes 1 Surface Surface to which the valve is mounted requires flatness of 0 025 mm 0 001 in over 100 mm 3
18. nce insures long life in critical industrial applications 2 stage design Enables high machine performance faster cycle times and greater accuracy all resulting in higher productivity Dual Coil torque motor Redundancy for high reliability Dual Precision Nozzles in Torque Motor Precision flow control and predictability Dry torque motor design Eliminates potential contamination issues in the air gaps of the torque motor that could cause machine downtime Hardened 440C Bushing and Spool Provides for high life wear resistance when used in the harsh environments provides for low sliding friction during use Emergency failsafe positioning Most valves are set up to return to a failsafe position when the command signal is interrupted or eliminated Field replaceable pilot stage filter Enables preventive maintenance in the field saving precious machine downtime and service costs External null bias adjustment Enables technicians to manually adjust the null bias of the valve to adapt to the conditions of the machine see section on null flow adjustment Page 11 This feature provides a simple adjustment to machine performance without the need to adjust a controller Standard field configurable 5th port for separate pilot Provides for the precise control of low pressure supply applications Carbide ball in hole feedback mechanism Extends lifetime of servo valve when compared to slotted spool and sapphire ball designs Re
19. ndard Frequency Response 100 step 63 l min 16 5 gpm 210 bar 3 000 psi DTE 24 38 C 100 F 210 bar 3 000 psi DTE 24 38 C 100 F 65 l min 16 5 gpm Rev H January 2014 7 TECHNICAL DATA Moog G761 761 Series Flow Control Servo Valves ELECTRICAL DATA Rated current and coil resistance A variety of coils are available for G761 761 Series Servo Valves which offer a wide choice of rated currents Coil impedance The resistance and inductance of standard coils are Inductance is determined under pressurized given below The 2 coils in each Servo Valve are wound operating conditions and is greatly influenced by back with equal turns giving a normal production tolerance electromagnetic forces of the torque motor These effects on coil resistance of 10 Copper magnet wire is vary with most operating conditions and vary greatly used so the coil resistance will vary significantly with with signal frequencies above 100Hz The apparent coil temperature The effects of coil resistance changes can be inductance values given are determined at 50 Hz essentially eliminated through use of a current feedback servoamplifier having high output impedance Ordering code Recommended rated current mA Coil resistance Power consumption W Command signal Ohms coil at 25 C 77 F Single coil Series coil Parallel coil Single coil Series coil Parallel coil H 15 7 5 15 206 0 046 0 023 0 023 L 40 20 40 80 0
20. ng service life All of our servo valves are known for high accuracy and reliable operation even in the harshest industrial applications These valves are suitable for electrohydraulic position speed pressure or force control systems with high dynamic response requirements Valve design 2 stage with spool and bushing and dry torque motor Mounting pattern ISO 10372 004 04 0 92 Maximum operating pressure to ports P T A B 315 bar 4 500 psi Pilot stage Nozzle Flapper Rated flow at Ap 35 bar spool land 4 l min 10 l min 19 l min 38 l min 63 l min 500 psi spool land 1gpm 2 5 gpm 5 gpm 10 gpm 16 5 gpm Step response time for O to 10096 stroke 5 ms ms 16 ms 9001 lt gt CE d W Wi Intrinsically safe valve versions are available for use in potentially hazardous environments Specific models are certified to FM ATEX CSA TIIS and IECEx standards Contact Moog for details UJ Rev H January 2014 INTRODUCTION Moog G761 761 Series Flow Control Servo Valves FEATURES AND BENEFITS The G761 761 Series is proven technology that performs reliably in machines where high performance stability and accuracy are required Moog s Mechanical Feedback Valves are designed to provide high reliability and long service life Features Benefits 10096 factory tested to ensure critical specification Ensures smooth and easy startup reduces downtime and performa
21. og for global support including e Repair services using OEM parts are performed by trained technicians to the latest specifications Stock management of spare parts and products to prevent unplanned downtime Rev H January 2014 16 ORDERING INFORMATION ACCESSORIES AND SPARE PARTS Series Dependent Accessories and Spare Parts Accessories G761 761 Series Moog G761 761 Series Flow Control Servo Valves Part designation Description Part number Attachment screws 4 required M8x45 ISO 4762 10 9 tightening Torque 11 Nm 8 Ibf in B64929 008B045 Metric Attachment screws 5 16 18NC by 1 75 long A31324 228B Inch Mating connector 4 pin electrical connector 49054F014S002S MS3106F14S 2S Mounting manifold Base mounting manifold four port 43586AM007 Flushing plate Manifold employed in place of valve when initially cleaning hydraulic fluids 23718 001K002 AMO manifold Adjustable metering orifice manifold used to bleed fluid between A and B 65568AM002 ports for better pressure control CRV manifold Cross port relief manifold used to limit pressure levels in ports A and B 65711AMO003 XXXX Safety manifold Sandwich manifold used to lock extend and retract cylinder upon loss of electrical signal or hydraulic pressure B64377AMNNXXXX Spare Parts G761 761 Series 2 pieces O ring 3 7 mm 0 145 in inside diameter x 1 8 mm 0 070 in cross section Equivalent MI
22. ontributor to component wear and silting Rev H January 2014 Moog G761 761 Series Flow Control Servo Valves Valve Tester Mounting Manifolds Hydraulic Filters Assuming that the filters are properly dimensioned and care is taken during initial installation and maintenance the aim should be to limit oil contamination to 14 11 under ISO 4406 1987 or 17 14 11 under ISO 4406 1999 For long life the maximum levels per ISO 4406 1987 and 1999 are 13 10 and 15 13 10 respectively It is important to note that these are maximum contamination levels and with proper care and regular filter change significantly lower levels can and should be achieved Attention must also be paid to a number of other factors that contribute to oil condition problems such as elevated temperatures high tank humidity dirty new oil etc BACKGROUND ROUTINE MAINTENANCE GUIDELINES Every six months or 4 000 operating hours check for proper operation of the control valve assembly by performing the preventative maintenance steps outlined below These checks do not require removal of the valve from the process line If a problem is suspected repair the valve assembly prior to returning the unit to service e Replace the hydraulic filter element e Stroke the valve and check for smooth full stroke operation unsteady motion could indicate a servo valve actuator or process valve problem GENERAL INFORMATION Effects when S
23. s upon request Hydraulic Data Maximum operating pressure to ports P T A B X 315 bar 4 500 psi Rated flow at p 35 bar spool land 500 psi spool land 4 10 19 38 63 l min 1 2 5 5 10 16 5 gpm Maximum main stage leakage flow rate zero lap 2 3 l min 0 60 gpm Null adjust authority Greater than 10 of rated flow Hydraulic fluid Hydraulic oil as per DIN 51524 parts 1 to 3 and ISO 11158 Other fluids on request Temperature range 40 to 60 C 40 to 140 F Recommended viscosity range 10 to 97 mm s cSt Maximum permissible viscosity range 5 to 1 250 mm s cSt Recommended cleanliness class as per ISO 4406 For functional safety 17 14 11 For longer life 15 13 10 Recommended filter rating For functional safety B lt 75 10pm absolute For longer life B lt 75 5 um absolute Static and Dynamic Data Rated Flow 4l min 10l min 19l min 38l min 63 l min 1gpm 2 5gpm 5gpm 10gpm 16 5 gpm Tolerance of rated flow 10 of rated flow Step response time for 0 to 100 stroke 5 ms 5 ms 5 ms 7 ms 16 ms Threshold lt 0 5 of rated signal Hysteresis lt 3 0 of rated signal Null shift at A T 38 C 100 C lt 2 0 of rated signal Rev H January 2014 6 TECHNICAL DATA Moog G761 761 Series Flow Control Servo Valves G761 761 SERIES SERVO VALVES
24. stor is located on top of the motor cap which if rotated magnetically biases the first stage torque motor with zero current electrical connector disconnected Using a 7 8 inch wrench rotate the magnetic adjustor on top of the motor cap to obtain the desired null flow condition Maximum adjustment is achieved with rotation of 90 The magnetic null adjustment allows at least 10 adjustment to the null flow Mechanical Adjustment Procedure With zero current electrical connector disconnected Using a 3 8 inch offset wrench loosen the self locking fitting until the null adjustor pin can be rotated This should usually be less than 1 2 turn DO NOT remove the self locking fitting Insert a 3 32 inch Allen wrench in the null adjustor pin Use the 3 32 Allen wrench to rotate the mechanical adjustor pin to obtain the desired null flow Re torque the self locking fitting to 57 in lbs Optional Magnetic Null Adjust Rev H January 2014 11 BACKGROUND Moog G761 761 Series Flow Control Servo Valves FLOW CALCULATION The actual flow is dependent upon electrical command Flow Diagram signal and valve pressure drop The flow for a given valve pressure drop can be calculated using the square root 151 40 function for sharp edge orifices E 114 30 E gs Ap gt a EE B 76 20 ole S Q actual flow
25. toring Valves The following effects may occur when storing valves for a long time Sealing materials become brittle possibly resulting in leaks Hydraulic fluid becomes gummy possibly resulting in friction Storage Time The storage time starts at stock receipt and ends at mounting of the valve Preservatives If preservation is carried out use only preservatives which are compatible with the sealing materials and do not affect the valve spare parts and accessories BEFORE STORAGE Note If the valves are exposed to aggressive environmental influences during storage vacuum packaging may be necessary We recommend the following preparatory measures for storage Mount the shipping plate on the valve This is the only way of adequately protecting the valves against the ingress of dirt and moisture and protecting the seals against the effects of ozone and UV Put the valve spare parts and accessories into the original packaging Package each valve separately Enclose anti tarnish paper or package the valve spare parts and accessories with corrosion inhibiting film Only for storage time 1 year Multipacks of single valves in their individual packages are allowed Seal the original packaging properly This is the only way of adequately protecting the valves spare parts and accessories against damage Rev H January 2014 Moog G761 761 Series Flow Control Servo Valves STORAGE CONDITIONS We recomm
26. v H January 2014 4 INTRODUCTION DESCRIPTION OF OPERATION The G761 761 Series Flow Control Servo Valve consists of a polarized electrical torque motor and two stages of hydraulic power amplification The motor armature extends into the air gaps of the magnetic flux circuit and is supported in this position by a flexure tube member The flexure tube acts as a seal between the electromagnetic and hydraulic sections of the valve The 2 motor coils surround the armature one on each side of the flexure tube The flapper of the first stage hydraulic amplifier is rigidly attached to the midpoint of the armature The flapper extends through the flexure tube and passes between 2 nozzles creating two variable orifices between the nozzle tips and the flapper The pressure controlled by the flapper and nozzle variable orifice is fed to the end areas of the second stage spool Electro hydraulic Servo Valve Cut away Coil Moog G761 761 Series Flow Control Servo Valves The second stage is a conventional four way spool design in which output flow from the valve at a fixed valve pressure drop is proportional to spool displacement from the null position A cantilever feedback spring is fixed to the flapper and engages a hole in the center of the spool Displacement of the spool defects the feedback spring which creates a force on the armature flapper assembly Input signal induces a magnetic charge in the armature and causes a deflection of
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