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Vickers Directional Controls Directional Control · PDF fileCam operated directional control valve ... directional control valves come in four basic versions: ... (3.4 lbs.) Single

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  • Directional Control ValvesDG3V-3-*-60 Hydraulic OperatedDG17V-3-*-60 Lever OperatedDG18V-3-*-60 Air OperatedDG20V-3-*-60 Cam OperatedDG21V-3-*-60 Plunger OperatedCETOP 3, NFPA D03, ISO 4401

    682Released 5/94

    Vickers

    Directional Controls

  • 2

    Introduction

    Vickers directional valves offer versatilityof applciation for the many directionalcontrol requirements of hydraulicmachinery. Ruggedness of design,manufacturing quality, and worldwideparts and service availability maximizeuptime, resulting in greater profits foryour company.

    Manual Lever/Cam/PlungerValvesThese valves are available in an NFPAD03 interface. These valves are ratedat flows to 75 l/min (20 USgpm) and 350bar (5000 psi) maximum pressure.Roller cam, plunger, spring offset,detented, spring centered, knob or leveroperated models are available.

    Air OperatedAvailable in an NFPA D03 interface withrated flows to 75 l/min (20 USgpm) andmaximum pressure of 350 bar (5000 psi).

    Hydraulic Pilot OperatedAvailable in an NFPA D03 interface.Valves are rated at flows to 151 l/min(40 USgpm) and maximum pressure of350 bar (5000 psi)

    Feature and Benefits High pressure and flow capability for

    maximum costeffectiveness

    Low headloss to minimize power loss

    Lowshock characteristics tomaximize machine life

    Choice of five types of control tosatisfy applications where electricalcontrol is not appropriate

    Designed and manufactured byVickers, with over 70 years as theglobal leader in fluid power and motioncontrol.

    Eaton Hydraulics, Incorporated 2000All Rights Reserved

    DG17V3* 60 Lever Operator

    DG18V3*60 Air Operator

    Section Views

    DG3V3*60 Hydraulic Operator

    DG20V3* 60 Cam Operator DG21V3* 60 Plunger Operator

  • 3

    Table of Contents

    General Information 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    DG3V-3-*-60 Hydraulic OperatedDG**V-3-*-60 Lever/Cam/Plunger OperatedDG18V-3-*-60 Air Operated

    Mounting Position 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Literature

    Hydraulic Operator Model Code 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    DG3V-3-60 Functional Symbols 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    DG3V-3-60 Performance Data 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    DG3V-3-60 Installation Dimensions 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    Lever/Cam/Plunger Operator Model Code 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    DG17/20/21V-3-60 Functional Symbols 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pressure Drops

    DG17V-3-60 Installation Dimensions 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    DG20V-3-60 Installation Dimensions 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    DG21V-3-60 Installation Dimensions 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    Air Operator Model Code 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    DG18V-3-60 Functional Symbols 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    Pressure Drops 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    DG18V-3-60 Installation Dimensions 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    Mounting Interface 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

    Application Data 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

  • 4

    General Information

    General DescriptionFive types of valve are available withdifferent controls primarily for controllingthe starting, stopping and direction offluid flow in a system.

    Basically, the valves are developed fromthe well-known series of DG4V-3-60series solenoid operated valves (seeVickers literature # GB-C-2015). Thesemanual valves are available with achoice of up to nine different spooltypes, depending on valve configuration.All spools have been designed toprovide good low-shock characteristics.External regulation of the control inputby hydraulic, lever, pneumatic, cam orplunger operation allows matching tovirtually any requirement whereelectrical control is not appropriate.

    Models include no-spring, spring offset,spring centered and detented versions.

    DG3V-3-*-60 HydraulicOperatedThe hydraulic operated DG3V-3-*-60directional valves are used to control thedirection of flow in a hydraulic circuit, whichwould control the movement of a workcylinder or the rotation of a fluid motor.

    DG**V-3-*-60Lever/Cam/PlungerOperated

    Operating InformationThe DG21V-3 plunger operator valves areinternally drained to port T. They may beused only when surges or back pressurein the tank line cannot overcome the forceapplied to depress the plunger.

    DG17/20/21 models must be releasedfrom actuated positions, withoutrestriction to ensure proper spring return.

    Manual lever and cam operations mustbe released from their actuated positions,without any restrictions to spring return.

    Cam operated directional control valveinstallation recommendations:

    Maximum cam angle 35

    Cam travel for dead band of 9 30 oneither side of center for closed centerspools for 35 cam.

    This dead band should be taken intoconsideration when designing camand system circuits.

    Cam should not drive roller at itsvertical centerline to avoid any sideloading on roller lever mechanism.

    Actuation ForceUnder rated conditions*, theapproximate actuation force will be asshown in the chart below:

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    "

    !

    #$%&$&'(')*$('+$')$$%)$''&%'($,(!-.

    ')$%&$)$''&)$,''

    !-. ')$&''')'(

    NOTEIn right hand assembly, operator Ais always removed. In left handassembly, operator B is alwaysremoved. Please note thatEuropean designations are theopposite. See diagram on thenameplate of the valve for operator(port) identification.

    DG18V-3-**-60 Air OperatedVickers air operated DG18V-3-**-60directional control valves come in fourbasic versions: 3 position springcentered; 2 position detent; 2 positionspring offset to port A, B operator; 2position spring offset to port B, A operator.

    NOTEManual actuator in end cap feature(P2) available on single operatormodels only.In right hand assembly,operator A is always removed. Inleft hand assembly, operator B isalways removed. See identificationplate on top of valve for operator(port) identification.

    For every 3,3 bar (50 psi) increase intank line pressure the air pilotpressure must be increased 0.07 bar(1 psi). Maximum tank line pressureis 100 bar (1450 psi).

    Nameplate identification label isasymmetrical and fixes the A andB operators in relation to the Pport. Designers should note forinstallation on vertical panels.

    On all right hand models, whenoperator A is pressurized, flow isalways P to A. When operator B ispressurized, flow is always P to B.Operators A and B are identifiedon the identification plate on top ofthe valve. For left hand assemblythis is reversed (P to B when the Aoperator is pressurized).

    Shift TimeShift time is essentially dependent uponpilot pressure, line length and diameter,and speed of control mechanism. Springreturn time from the offset to centerposition is approximately 45 msec. atrated flow and pressure assumingminimal back pressure in the pilot line.

  • 5

    General Information

    Shifting ActionSpring centered and spring offset typeswill be spring positioned unless sufficientpilot pressure is maintained at pilot portto shift and hold the valve spool.No-spring (offered as pilot valves forno-spring detented models only) requireonly momentary pressurization of pilotport to shift spool (approx. 0.1 seconds).

    When pilot pressure is relieved, spoolwill remain in last position attainedprovided there is no severe shock,vibration or unusual pressure transients.

    NOTESurges of oil in a common tank lineserving these and other valves canbe of sufficient magnitude to causeinadvertent shifting of these valves.This is particularly critical in theno-spring and no-spring detentedtype valves. Separate tank lines or avented manifold with a continuousdownward path to tank is preferred.

    Any sliding spool, if held shifted underpressure for long periods of time, maystick and not spring return due to fluidresidue formation (silting) and therefo

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