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Bucher Hydraulics AG Neuheim, Switzerland Product Presentation Division MobileCompany and Product PresentationNovember 2008page 1Application Mobile CraneTelescope Winch (Hoist) Boom & DerrickingSlewing GearStabilisingCompany and Product PresentationNovember 2008page 6Load Control ValveCompany and Product PresentationNovember 2008page 10CINDY Load Control Valve• size 12 to 25 • maximum working pressure 420 bar • nominal flow up to 500 l/min • SAE, manifold or cartridge constructionCompany and Product PresentationNovember 2008page 11Available CoversActuatorCover PilotG cover Standard CoverCover D Dumping Covermechanical override includedCover H hydro-mechanical stroke limitermechanical override includedCover R hydraulic pressure reducing valveCover E electro-proportional pressure reducing valvePumpCompany and Product PresentationNovember 2008page 12Available CoversCover G Standard CoverCover D Dumping Covermechanical override includedCover H hydro-mechanical stroke limitermechanical override includedCover R hydraulic pressure reducing valveCover E electro-proportional pressure reducing valveCompany and Product PresentationNovember 2008page 13Available CoversCover G Standard CoverCover D Dumping Covermechanical override includedCover H hydro-mechanical stroke limitermechanical override includedCover R hydraulic pressure reducing valveCover E electro-proportional pressure reducing valvepiloted by currentCompany and Product PresentationNovember 2008page 14Typical Characteristic Curve B A (load control function)• CINDY 25 • Flow from Actuator back to tankS240 (e.g.) means, that the spool has around 30 bar back pressure at 240 l/min.Company and Product PresentationNovember 2008page 15Typical Characteristic Curve A B (check valve function)• CINDY 25 • Flow from pump to Actuator; the valve works as a check valve. • The pressure through the valve is only depend from the housing.Company and Product PresentationNovember 2008page 16OverviewCartridge only size 20 & 25. Cover R & E for CINDY 12 and manifold not applicable. For pressure relief valves (SVA, SVT, SVZ) please consult data sheets.Company and Product PresentationNovember 2008page 17Cindy Neutral Position“Valve leakfree closed”Load Pressure Pilot Spool Port BPilot Pressure Port XReturn Line Pressure Port ACompany and Product Presentation November 2008Pilot Control Spool Main Control Spoolpage 40Cindy Lifting Position“Function as a check valve”Load Pressure Pilot Spool Port BPilot Pressure Port XPump Pressure Port ACompany and Product Presentation November 2008Pilot Control Spool Main Control Spoolpage 41Cindy Neutral Position“Valve leakfree closed”Load Pressure Pilot Spool Port BPilot Pressure Port XReturn Line Pressure Port ACompany and Product Presentation November 2008Pilot Control Spool Main Control Spoolpage 42Cindy Lowering Start“Pre-opening”Load Pressure Pilot Spool Port BPilot Pressure Port XReturn Line Pressure Port ACompany and Product Presentation November 2008Pilot Control Spool Main Control Spoolpage 43Cindy Lowering Position“Open as a control valve”Load Pressure Pilot Spool Port BPilot Pressure Port XReturn Line Pressure Port ACompany and Product Presentation November 2008Pilot Control Spool Main Control Spoolpage 44Recommondations for Different Kind of ApplicationsCompany and Product PresentationNovember 2008page 45WINCHCompany and Product PresentationNovember 2008page 46Winch – Cover Kload er Y D v IN by C roove co g n i r . g Lowe lve with site side a oppo rol v cont ted from piloCompany and Product PresentationNovember 2008page 47Description Cover K• For non-vibrating winch function piloted from the opposite side • Leak oil at port DD1 must be drain off to tank without back pressuregroove DD1XCompany and Product Presentation November 2008 page 48BOOMCompany and Product PresentationNovember 2008page 49Boom –Cover R L o w e r i n g b y P A R A L L E L p i l o t e d m a i n c o n t r o l s p o o l a n d l o a d c o n t r o l v a l v e .•We recommend this cover for a compensated and overcompensated version •It requires a drain line back to tank with 0 (zero) bar•The maximum allowable inlet pressure at port X is 100 barBoom –Cover EL o w e r i n g b y E L E C T R O N I C p i l o t e d C I N D Y l o a d c o n t r o l v a l v e .Description Cover E•Gives the benefit of electro proportional control of a boom function •Leak oil at port DD1 must be drain off to tank without back pressure •The maximum allowable inlet pressure at port X is 50 barDescription Overcompensation (1)overcompensation orifice must be bigger than ∅1.2 mm!Description Overcompensation (2)valve must always be externally controlled (cover R or E).CINDY –Type CodeType CodeType CodeType Code -ExampleApplication:Winch lowering by a CINDY load control valve with a groove cover piloted from the opposite side .Pressure relief valve B to T; adjusted at 300 bar (max. 420 bar)Valve Series CINDY load control valve Nominal size 12; 16; 20; 25VersionSAE flange-mounted / seal material Nitrile / screws dacromate Flow rate200 l/min flow at circa 33 bar ∆p Influence of return line L = independent of back pressure in A Pilot controlling Damping cover with grooveOrifice combination12-40 bar; ZD = none; D1 = ∅0,6; By = ∅0,3Type Code -ExampleApplication:Winch lowering by a CINDY load control valve with a groove cover piloted from the opposite side .CINDY 20B SND S200L K 12-4SVT300Designfor AVR Valve and Electronic ControllerAVR ValveThe AVR system automatically reduces theamount of the displacement of the main controlspool, if the sum of the operated actuator flowbegins to exceed the available pump deliveryflow.The difference between available and requiredpump flow is detected by the AVR pressureregulator valve, which begins to reduce the pilotcontrol pressure feeding the proportional pilotvalves.The AVR system automatically reduces theamount of the displacement of the main controlspool, if the sum of the operated actuator flowbegins to exceed the available pump deliveryflow.The difference between available and requiredpump flow is detected by the AVR pressureregulator valve, which begins to reduce the pilotcontrol pressure feeding the proportional pilotvalves.AVR –Hydraulic CircuitPractical representation (example)Operating Example (1)Operating Example (2)condition: Q1 + Q2 + Q3 ≤p m Automatic Volumetric Flow Rate Reductionf l o w r a t e o f t h e v a l v e i n %255075100Electronic Controller -RecommendationsElectronic Data of SolenoidsCompany and Product PresentationNovember 2008page 76Control Characteristic(idealized)Company and Product PresentationNovember 2008page 77Setting of an Electronic ControllerCompany and Product PresentationNovember 2008page 78Different Configurations for AccelerationCompany and Product PresentationNovember 2008page 79Different Configurations for DecelerationCompany and Product PresentationNovember 2008page 80Thank you very much for your attention! Robert Kern Application ManagerCompany and Product Presentation November 2008 page 81。