CMX Sectional Controls - Eaton

1 CMX Sectional ControlsApplication Guide536 Revised 3/95 Vickers Directional Controls2 Third generation closed center load sensing is time has arrived when you canmove up to higher levels of vehicleperformance by incorporating theVickers CMX load sensing controlsin your next design. It's no longernecessary to demand that themachine operator demonstrateoutstanding skills to obtainmaximum incorporating advancedstate of the art valve elementconcepts, the CMX provides velvetsmooth" controllability of the rawbrute force available from yourhydraulic system. No other systemoffers the flexibility to easily tailorindividual function control to yourexact needs!Today's load sensing systems willdramatically reduce the overallpower requirements of yourmachine's hydraulic system byeliminating unnecessary losseswhen multiple unequal loads areoperated , care must be taken toinsure proper phasing to avoidunnecessary power waste inunequal displacement functionssuch as typical cylinderapplications.

2 Competitive systemsrequire careful and lengthy spooldevelopment to match eachoperating section to its specificfunctional load requirements. Sinceeach spool must be matched to itsindividual function, service supportis CMX family has been designedfrom the first line on the computerscreen with your needs in to its modular elementconstruction, it can be easilytailored to your exact system development anddebugging is reduced to a matter of days rather than the traditionalweeks or months necessary withcompetitive designs. On site serviceis a breeze. Service and production support inventory isdramatically best of all, it's available todayin all the popular basic and optionalconfigurations, just the way youwant it. Hydraulic orelectrohydraulic Controls , mid inlets,and mixed flow arrangements arejust a few of the almost endlessfeatures application guide has beendeveloped to assist in selection of the features desired to meet your system assistance with your CMX valve requirements is as nearas your local Vickers Vickers EZSpec CMXP rogram, which incorporates theuse of pre-engineered components,he can quickly design, price,assemble, test, and ship valvebanks that satisfy the requirementsof most your Vickers salesrepresentative if special features -beyond those shown in thefollowing pages - are of ContentsGeneral Description4.

3 Operating Valve Section5 .. Flow path/actuation5 .. Section sizes8 .. Ratings8 .. Meter in element9 .. Flow control meter in elements9 .. Pressure control meter in elements15 .. Pressure compensated pressure control spool19 .. Flow limitation orifice20 .. Load sensing check valves22 .. Load drop check valves - standard24 .. Load drop check valves with bleed orifice24 .. Meter out elements26 .. Anticavitation check valves - standard31 .. Anticavitation module33 .. Float function35 .. Meter out spool36 .. Actuator port relief valve38 .. Hydraulic actuation43 .. Electrohydraulic actuation44 .. Special FeaturesMeter in pressure limitation50 .. Meter out poppet version51 .. Meter out spool version52 .. Swing drive with free coast53 .. High flow single acting CMX53 .. Swing drive with pressure controlled braking57 .. Free coast operation in neutral63 .. Inlet BodiesEnd inlet body - standard65.

4 End inlet body with load sensing relief valve66 .. Mid inlet67 .. Standard mid inlet67 .. Mid inlet with reducing valve and anticavitation make up flow68 .. End Cover69 .. Model CodesOperating valve sections70 .. Valve banks71 .. Port and Mounting Hole Sizes73 .. Valve Bank Dimensions74 .. 4 General DescriptionThe CMX Sectional valve is a stackable, load sensing, proportionaldirectional control valve, and can beoperated by hydraulic remote control (HRC) or electronic remote control (ERC) via integral electrohydraulicreducing characteristic feature of the CMXvalve line is the concept of separatemeter-in and meter-out elements (Figure 1). The meter-in element is apilot operated, flow force, pressurecompensated, proportional sliding spooland Controls fluid from the pump to theactuator. The meter-out elements arepilot controlled metering poppets, andcontrol exhaust fluid from the actuator totank.

5 Each meter-out poppet functionsas a variable orifice between one of theactuator s ports and the tank port, withthe degree of opening proportional tothe pilot 1. Basic CMX Concept ATBPM eter outMeter outMeter inThe separation of the meter-in andmeter-out elements, plus the valve smodular design, permits a broad rangeof control options to meet a variety ofload requirements. This is especiallydesirable for a stackable mobile valve,where a single valve bank must handlemany different CMX Sectional valve family consistsof two basic series with different flowratings the CMX100 and the valves are functionally identical,with most differences being due to thedifferences in their physical CMX valve bank is made up of aninlet body, from one to eight valvesections, and an end cover (Figure 2).The valve sections are connectedinternally to common pressure, tank,load sense, pilot supply and pilot drainpassages.

6 Face seals between thesections seal the connecting passages,and the sections are held together by tierods and nuts. Threaded mounting boltholes are provided on the inlet body andend pump, tank, load sense andelectrohydraulic pilot supply passagesare terminated in the inlet body, and thepilot drain is terminated in the end for the actuator and theHRC are made at each connections for electro-hydraulic valves are made at each and ERC controlled valves can beused in the same valve 25 Operating Valve SectionThe CMX valve section consists of threebasic parts: the main valve body, whichcontains the main flow passages andmain control elements, and two controlcaps that contain the pilot circuitry. Theone-piece control cap gaskets (Figure3), which provide a seal between thecontrol caps and the main valve body,are also part of the pilot circuit, providinga passage from the meter-in springchamber to the relief valve pilot stageand the meter-out servo.

7 This formatallows for a wide variety of controloptions from relatively few basic parts;thus the valve can be tailored to theapplication at minimal extra cost. It alsomakes the valve quick and easy to finetune for a specific Path/ActuationHydraulically Actuated(Refer to following page.) When pilot pressure is applied to PortC1, pump flow is to Port B. When pilot pressure is applied to PortC2, pump flow is to Port Actuated (Click here for illustrations.) When Solenoid A is energized, pumpflow is to Port A. When Solenoid B is energized, pumpflow is to Port 3 control Cap GasketPilot relief valve (electrohydraulic models)Meter-out servoDrainPilot relief valve (hydraulic models)Restriction (orifice)Pilot supply passage(electrohydraulic models)Electrohydraulic pilot spoolMeter-in spring chamber6 Operating Valve SectionCutaway views of the hydraulic andelectrohydraulic versions of the CMXare shown in Figures 4 and 5, alongwith schematic diagrams.

8 The reliefvalve pilot stages are shown in detail inthe schematic diagrams used in thisdiscussion to promote a betterunderstanding of the valve s Port A Actuator Port B Meter-outPoppetLoadSensingCheckValvesPil otPressurePort C1 Meter-inSpoolMeter-inChambersReturn PortControlCapLoad DropCheckPilotReliefPilotPressurePort C2 GasketVentValveInlet PortHydraulic Valve SectionC1 DRTLSPDRC2 ABFigure 47 B Solenoid Electrohydraulic Valve SectionPLSTBAPSDRPS DRLoad SensingCheck ValvesVentMeter-inSpoolMeter-in ChambersValve InletPortGasketPilot SupplyPassages A SolenoidPilot Relief(As shown inFigure 4,precedingpage.)Load Drop CheckActuator Port B Actuator Port A Return PortMeter-out PoppetElectro-hydraulicReducingValveSpoo lFigure 5 Adjustable Relief (optional)Sol. ASol. B8 Operating Valve SectionThe main valve body is available as anarrow body with an actuator portpressure rating of 290 bar (4200 psi)and an inlet port pressure rating 250 bar(3625 psi), or as a wide body with anactuator port pressure rating of 380 bar(5510 psi) and an inlet port pressurerating of 350 bar (5075 psi).

9 Valvesections with different pressure ratingscan be used in the same valve section sizes and ratings areshown below. Click here for port and mounting hole Section SizesCMX100-S2 (narrow body and290 bar (4200 psi) rating)Hydraulic Actuation -Dimensions: 201 mm ( in) long x 47,0 mm ( in) wide x 149 mm ( in) : 7,3 kg ( lbs)Electrohydraulic Actuation -Dimensions: 366 mm ( in) long x 47,0 mm ( in) wide x 149 mm ( in) : 9,0 kg ( lbs)CMX100-F2 (wide body and380 bar (5510 psi) rating)Hydraulic Actuation -Dimensions: 201 mm ( in) long x 59,0 mm ( in) wide x 144 mm ( in) : 8,7 kg ( lbs)Electrohydraulic Actuation -Dimensions: 366 mm ( in) long x 59,0 mm ( in) wide x 144 mm ( in) : 10,4 kg ( lbs)CMX160-S2 (narrow body and290 bar (4200 psi) rating)Hydraulic Actuation -Dimensions: 243 mm ( in) long x 51,0 mm ( in) wide x 172 mm ( in) : 10,2 kg ( lbs)Electrohydraulic Actuation -Dimensions: 386 mm ( in) long x 51,0 mm ( in) wide x 172 mm ( in).

10 11,8 kg ( lbs)CMX160-F2 (wide body and380 bar (5510 psi) rating)Hydraulic Actuation -Dimensions: 243 mm ( in) long x 75,0 mm ( in) wide x 165 mm ( in) : 13,4 kg ( lbs)Electrohydraulic Actuation -Dimensions: 386 mm ( in) long x 75,0 mm ( in) wide x 165 mm ( in) : 15,1 kg ( lbs)Notes: Dimensions and weights for G and W sections are identical to F sections. Click here for port dimensions. Click here for valve bank SeriesRated Flow *l/min (USgpm)HydraulicHorsepowerPressure PortRated Pressure bar (psi)Actuator PortRated Pressure bar (psi)Pilot, Tank andDrain PortRated Pressure bar (psi)CMX100-F/G/W100 (26)77350 (5075)380 (5510)35 (508)CMX100-S100 (26)55250 (3625)290 (4200)35 (508)CMX160-F/G/W160 (42)124350 (5075)380 (5510)35 (508)CMX160-S160 (42)89250 (3625)290 (4200)35 (508)* At 14 bar (200 psi) load-sensing pressure operating elements in the CMXsectional valve can be divided into fivefunctional groups: meter-in, meter-out,load drop check valves, load sensecheck valves and relief valve pilotstages.