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Constant Flow Open Centre System “CFO”

System with fixed pump. Spool in neutral. Activated spool. Max. Pump Flow. 200 bar. 50 bar. 100 bar. “ METER IN” LIFTING. “ METER OUT” LOWERING. 50 bar. 100 bar. 200 bar. 100 % Spool travel. Typical flow characteristic Manually controled valve.

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Constant Flow Open Centre System “CFO”

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  1. System with fixed pump Spool in neutral Activated spool Max. Pump Flow 200 bar 50 bar 100 bar “METER IN” LIFTING “METER OUT” LOWERING 50 bar 100 bar 200 bar 100 % Spool travel Typical flow characteristic Manually controled valve Constant Flow Open Centre System “CFO”

  2. Max. Pump Flow “METER OUT” LOWERING “METER IN” LYFTING 100 % Spool travel Typical flow characteristic Manual controlled valve System with variable pump Spool in mid position Activated spool 50 bar 200 bar 100 bar Load-sensing system “LS” Closed Centre Valve

  3. System with fixed pump and LS valve L90LS valve F1 + pump Constant Flow Closed center system “CFC”

  4. 50 100 200 200 50 100 200 210 210 210 210 210 210 210 System with fixed pump and LS valve THREE FUNCTIONS WITHOUT INDIVIDUAL PRESSURE COMPENSATORS

  5. PILOT STAGE PRESSURE COMPENSATOR INDIVIDUAL COMPENSATOR WITH PRESSURE REDUCTION FUNCTION OR FEED REDUCTION FUNCTION

  6. 200 50 100 100 50 200 200 56 206 106 6 BAR 6 BAR 6 BAR 210 210 210 210 System with fixed pump and LS valve THREE FUNCTION WITH INDIVIDUAL PRESSURE COMPENSATORS

  7. Energy comparison in systems Systems with variable pump ”LS” Systems with fixed pump ”CFO” P pressure P pressure Q flow Q flow

  8. Applications well suited for ”LS” Very suitable for ”LS” systems Great demands for manoeuvrability Forest machine Excavator Backhoe loader Arial lift Refuse collector Large wheel loader Hook loader Great demands for productivity

  9. When partial pump flow is used for individual functions At high intensity usage To create simple system solutions when a number of functions with different flow rates is demanded When system layout is spread out At simultanious operation of functions Power control and energy conservation Reduce energy losses at idling and transportation System with variable pump and LS Suitable when;

  10. Avoid to mix light and heavy loads from the same pump. Avoid to mix large and small flow demands from the same fixed pump. Never control max flow with line mounted restrictors. Always use the pump regulator to set maximum work pressure when you are using a variable pump. The pressure limiter of the valve needs to be set at least 30 bars above. Avoid to limit valve work port pressure with the chock valves, use the build in individual work port feed reducer. Make sure that the cylinders are correctly connected to the valve, the valve is normally adapted to the cylinder ratio. Save energy, design advises

  11. LS - Valve Range

  12. L90LS • Features • Emergency stop • Individual pressure compensators • Feed reducers • Force control • Fast acting leake tight port relief valves • Counter pressure valve • Built-in pilot pressure supply • Wide range of spool-actuators • Wide range of function adapted spools • Copied load signal • Fixed or variable pump

  13. L90LS • Pump unloading inlet • Built-in main & port relief valves • Built-in feed reducers • Copy spool function • Function manifolds • Spool actuators • manual • pneumatic prop & on-off • hydraulic • electro-hydraulic prop & on-off • Pressure compensators • Application adapted spools • CFC-systems • LS-systems • Flow/section 90 l/min, without compensator 130 l/min • Nodular iron • Max pressure 320 bar • Stackable 1 to 10 sections • Service ports • G1/2 • 7/8” - 14UN • Two speed control • Lever release function

  14. L90LS • Applications • Forest machines • Articulated truck cranes • Fork lifts • Excavators • Refuse vehicles • Skip loaders • Drill rigs • Customers • SISU Logging • F Weyhausen • Schaeff • Atlas Copco • Pel Job

  15. K170LS/K220LS • Features • Individual pressure compensators • Feed reducers • Force control • Fast acting leak tight port relief valves • Counter pressure valve • Built-in pilot pressure supply • Wide range of function adapted spools • Copied load signal • Intermediate sections • Mid-inlet

  16. K170LS/K220LS • LS-systems • Flow/section 170 l/min, without compensator 210 l/min • Nodular iron • Max pressure 320 bar • Stackable 1 to 10 sections • Motorports • G3/4 • 1 1/16” - 12UN • SAE 1” • Built-in main & port relief valves • Built-in feed reducers • Copy spool function • Spool actuators • hydraulic • electro-hydraulic prop & on-off • Pressure compensators • Application adapted spools • Intermediate sections

  17. K170LS/K220LS • Applications • Forest machines • Excavators • Backhoe loaders • Reach stackers • Wheel loaders • Fork lifts • Customers • Timberjack • Volvo • Barko • Ponsse • Kalmar LMV

  18. HV08 • Features • Optional unloading valve in the inlet section • Flow force pressure compensation • Feed reducers • Force control • Fast acting leak tight port relief valves • Counter pressure valve • Wide range of function adapted spools • Copied load signal • Anti-priority function

  19. HV08 • CFC-systems • LS-systems • Max flow/section 320 l/min • Grey & nodular iron • Max pressure 320 bar • Stackable 1 to 6 sections • Service ports • SAE 1” • Built-in main & port relief valves • Built-in feed reducer • Copy spool function • Spool actuators • manual • pneumatic prop & on/off • hydraulic • electro-hydraulic prop & on-off • Application adapted spools • Anti priority function

  20. HV08 • Applications • Reach stackers • Articulated dump trucks • Mobile cranes • Forest machines • Customers • Volvo • Kalmar LMV • SMV • Lansing

  21. M400LS • Features • Poppet design • zero leakage • not sensitive to temperature shocks • Fast acting leak-tight port relief valves • Counter pressure valve • Function adapted spools • Low pressure drops • high function speed • low energy consumption • Priority function • Easy to install • Dual cylinder ports

  22. M400LS • LS-systems • Flow/section 450 l/min • Nodular iron • Max pump pressure 300 bar • Max service port pressure 400 bar • Monoblock 2-section • Connections • Pump, 2 x 1 1/4 “ • Tank, 1 x 1 1/2” • Service ports, 8 x 1” • Built-in port relief valves • Built-in counter pressure valve • Spool actuators • PC • FPC • Built-in pressure-controlled float position function • Priority function • Poppet-valve concept • Application adapted spools

  23. M400LS • Applications • Wheel loaders • Reach stackers • Mobile cranes • Forest machines • Excavators • Customers • Volvo • Ljungby Machine • Luna

  24. RELIEF FUNCTION BYPASS VALVE A B T T DIRECTION CONTROL SPOOL COMPENSATOR (K) INDIVIDUAL PRESSURE REDUCTION FUNCTIONS L.S. LOGIC CHECK VALVE L.S. P P L.S. L90LS EMERGENCY STOP (BEN) CFC INLET SECTION + SPOOL SECTION

  25. L90LS Inlet section P1 T1 LS PX PL Inlet Compensator, Emergency Stop Function and Main Relief Valve With Pilot Assembly

  26. L90LS LS2 Inlet Section Showing Direct Acting Fixed Setting Relief Valve Cartridge

  27. L90LS PILOT STAGE MAIN STAGE A B T T DIRECTION CONTROL SPOOL COMPENSATOR (K) INDIVIDUAL PRESSURE REDUCTION FUNCTIONS COPY SPOOL L.S. LOGIC CHECK VALVE L.S. P P L.S. P.L. P.X. LS1 Inlet Section Showing Copy Spool Function

  28. L90LS LS PX PL Inlet Section Showing Copy Spool Function

  29. A B PS TP T MP P T3 P2 L.S.P. L.S. COUNTER PRESSURE VALVE L90LS Single Spool Valve EC Operated Showing Service Line Relief / Anti- cavitation Cartridges & Counter-pressure valve in Outlet Section

  30. L90LS Outlet Section T2/MP T3 TP PS LSP Outlet Section Showing Pressure Reducing For Pilot Supply and Counterpressure Valve

  31. L90LS Load sense valve LS and/or CFC Spool in neutral position

  32. L90LS Load sense valve LS and/or CFC Spool in outer position *PBAT = Pump to motorport B. Motorport A to tank.

  33. 100 75 FLOW (LPM) 50 25 0 20 40 60 80 100% SPOOL STROKE L90LS Metering to Motor Port Versus Spool Stroke

  34. 100 80 60 FLOW (LPM) 40 20 0 0 100 200 300 DIFFERENTIAL PRESSURE ( Bar ) L90LS Performance of Individual Compensator Against Differential Pressure from Valve Inlet to Motor Port

  35. L90LS Load sense valve LS and/or CFC with pressure feedback on B-side *PBAT = Pump to motorport B. Motorport A to tank.

  36. L90LS Load sense valve LS and/or CFC with LS-logic *PBAT = Pump to motorport B. Motorport A to tank.

  37. PS A B A B TP T T2 P T3 P2 L.S. L.S.P. L90LS Two spool valve with M10 manifold

  38. L90LS M10 Manifold Section

  39. BENEFIT FEATURE ADVANTAGE STACKABLE EASIER TO INSTALL. FLEXIBILITY. CHEAPER TO SERVICE. VALVE. SIMPLIFICATION RELIABILITY. MODULAR EASIER TO INSTALL SYSTEM. FEWER EXTERNAL CONSTRUCTION. COMPONENTS. SIMPLE DESIGN BETTER FUEL ECONOMY. LOAD SENSING HIGHER MACHINE OPTIMISED PERFORMANCE. WITH PERFORMANCE. EASIER TO RETROFIT OTHER FUNCTIONS VARIABLE PUMP. HIGHER WORKING CAPACITY. EASIER TO MEET LOWER OVERALL COST. EMERGENCY EC DIRECTIVES. IMPROVED SAFETY. STOP. EASIER TO INSTALL. IMPROVED RELIABILITY. SIMPLE SYSTEM DESIGN NO INTERFERENCE PRESSURE & ASSEMBLY. INDIVIDUAL MAX. BETWEEN FUNCTIONS. COMPENSATION. SPEEDS. EASY TO SET DIFFERENT INCREASED EFFICIENCY. FEED REDUCER SAFER OPERATION. FORCE LEVELS. EASILY INSTALLED LOWER INSTALLATION COST L90LS

  40. FEATURE ADVANTAGE BENEFIT IMPROVED STABILITY & SAFETY LESS WEAR & GREATER EFFICIENCY. LOWER RUNNING COSTS. MORE GENTLE MACHINE CHARACTERISTICS FORCE CONTROL . PREVENTS HIGH PEAK PRESSURES. PORT RELIEF’S CAN BE SET CLOSE TO MAX. WORKING PRESSURE. FAST ACTING LEAK TIGHT PORT RELIEF VALVES LESS STRESS ON MACHINE COMPONENTS. IMPROVED RELIABILITY.. IMPROVED MACHINE PERFORMANCE. LESS RISK OF CYLINDER OR MOTOR DAMAGE. IMPROVED FUEL ECONOMY LESS RISK OF CAVITATION SIMPLY TO INSTALL. ENABLES UNLOADED LOWERING. COUNTER - PRESSURE VALVES GREATER FLEXIBILITY. EASIER TO KEEP PILOT SYSTEM COMPLETELY CLEAN. IMPROVED RELIABILITY. LOWER INSTALLATION COST PROVISION FOR EXTERNAL PILOT FILTER EASY TO OPTIMISE IMPROVED FUNCTION MACHINE PERFORMANCE WITH ADAPTED CONTROLLABILITY, SPOOLS SAFETY & RELIABILITY. FEWER COMPONENTS SIMPLE SYSTEM LOWER INSTALLATION COST. PILOT PRESSURE ASSEMBLY. SUPPLY. IMPROVED RELIABILITY. FEWER COMPONENTS L90LS

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