Mobile Controls Division 21/03/22 Constant Flow Open Centre System “CFO” Spool in neutral Activated spool Typical flow characteristic Manually controled valve 2 0 0 b a r 2 0 0 b a r 10 0 bar 50 bar 10 0 b a r 50 bar 100 % Spool travel Max. Pump Flow “METER OUT” LOWERING “METER IN” LIFTIN G System with fixed pump
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Mobile Controls Division 01/05/2015 Constant Flow Open Centre System “CFO” Spool in neutral Activated spool Typical flow characteristic Manually controled.
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THREE FUNCTIONS WITHOUT INDIVIDUALPRESSURE COMPENSATORS
50
210
210 210
210
100
210
200
200
210
50 100 200
210
System with fixed pump and LS valve
Mobile Controls Division 18/04/23
INDIVIDUAL COMPENSATOR WITHPRESSURE REDUCTION FUNCTIONOR FEED REDUCTION FUNCTION
PILOTSTAGE
PRESSURE COMPENSATOR
Mobile Controls Division 18/04/23
THREE FUNCTION WITH INDIVIDUALPRESSURE COMPENSATORS
50
56
6 BAR
210
6 BAR
210
106
100
6 BAR
210
206
200200
210
50 100 200
System with fixed pump and LS valve
Mobile Controls Division 18/04/23
Systems with fixed pump ”CFO”
P pressure
Systems with variable pump ”LS”
P pressure
Q flow Q flow
Energy comparison in systems
Mobile Controls Division 18/04/23
Great demands for manoeuvrability
Arial lift
Very suitable for ”LS” systems
Applications well suited for ”LS”
Great demands for productivity
Forest machineExcavatorBackhoe loader
Hook loaderRefuse collectorLarge wheel loader
Mobile Controls Division 18/04/23
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
Suitable when;Suitable when;
System with variable pump and LS
Mobile Controls Division 18/04/23
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
Mobile Controls Division 18/04/23
100
M400
HV08 LS
K220LS
L90LS
400 500 600200 300Flow l/min
0
250-600
150-350
100-250
50-130
For systems For systems withwith variable variable displacementdisplacement pumps pumps
LS - Valve Range
Mobile Controls Division 18/04/23
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
Mobile Controls Division 18/04/23
CFC-systems
LS-systems
Flow/section 90 l/min, without compensator 130 l/min