Mobile Controls Division 01/05/2015 Constant Flow Open Centre System “CFO” Spool in neutral Activated spool Typical flow characteristic Manually controled

Mobile Controls Division 18/04/23

Constant Flow Open Centre System “CFO”

Spool in neutral Activated spool

Typical flow characteristicManually controled valve

200

bar

200

bar

100

bar

50 b

ar10

0 ba

r

50 b

ar

100 %Spool travel

Max.PumpFlow

“METEROUT”

LOWERING

“METERIN”

LIFTING

System with fixed pump


200

bar

100

bar

50 b

ar

System with variable pump

Load-sensing system “LS”Closed Centre Valve

Spool in mid position Activated spool

Typical flow characteristicManual controlled valve

100 %Spool travel

Max.PumpFlow

“METEROUT”

LOWERING

“METERIN”

LYFTING


F1 +pump

L90LSvalve

Constant Flow Closed center system “CFC”

System with fixed pump and LS valve


THREE FUNCTIONS WITHOUT INDIVIDUALPRESSURE COMPENSATORS

50

210

210 210

210

100

210

200

200

210

50 100 200

210



INDIVIDUAL COMPENSATOR WITHPRESSURE REDUCTION FUNCTIONOR FEED REDUCTION FUNCTION

PILOTSTAGE

PRESSURE COMPENSATOR


THREE FUNCTION WITH INDIVIDUALPRESSURE COMPENSATORS

50

56

6 BAR

210

6 BAR

210

106

100

6 BAR

210

206

200200

210

50 100 200



Systems with fixed pump ”CFO”

P pressure

Systems with variable pump ”LS”

P pressure

Q flow Q flow

Energy comparison in systems


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


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


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


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


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


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

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

L90LS


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


K170LS/K220LSK170LS/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


K170LS/K220LS/K220LS

LS-systems

Flow/section 170 l/min, without compensator 210 l/min

Nodular iron



Motorports G3/4 1 1/16” - 12UN SAE 1”


Built-in feed reducers

Copy spool function

Spool actuators hydraulic electro-hydraulic prop &

on-off

Pressure compensators


Intermediate sections


K170LS/K220LS/K220LS

Applications

Forest machines Excavators Backhoe loaders Reach stackers Wheel loaders Fork lifts

Customers Timberjack Volvo Barko Ponsse Kalmar LMV


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


HV08

CFC-systems

LS-systems

Max flow/section 320 l/min

Grey & nodular iron



Service ports SAE 1”


Built-in feed reducer

Copy spool function

Spool actuators manual pneumatic prop & on/off hydraulic electro-hydraulic prop &

on-off


Anti priority function


HV08

Applications Reach stackers Articulated dump

trucks Mobile cranes Forest machines

Customers Volvo Kalmar LMV SMV Lansing


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


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



M400LS

Applications Wheel loaders Reach stackers Mobile cranes Forest machines Excavators

Customers Volvo Ljungby Machine Luna

Mobile Controls Division 18/04/23 24

EMERGENCYSTOP (BEN)

CFC INLET SECTION + SPOOL SECTION

T

L.S.

P

COMPENSATOR(K)

DIRECTIONCONTROLSPOOL

L.S.LOGICCHECKVALVE

INDIVIDUALPRESSUREREDUCTIONFUNCTIONS

T

L.S.

P

AB

BYPASSVALVE

RELIEFFUNCTION

L90LS


Inlet Compensator, Emergency Stop Function and Main Relief Valve With Pilot Assembly

LS

PX

PL

P1 T1

L90LS Inlet section


LS2 Inlet Section Showing Direct Acting FixedSetting Relief Valve Cartridge

L90LS


T

L.S.

P

COMPENSATOR(K)

DIRECTIONCONTROLSPOOL

L.S.LOGICCHECKVALVE

INDIVIDUALPRESSUREREDUCTIONFUNCTIONS

T

L.S.

P

AB

MAINSTAGE

PILOTSTAGE

P.L.P.X.

LS1 Inlet Section Showing CopySpool Function

COPYSPOOL

L90LS


Inlet Section Showing Copy Spool Function

LS

PX

PL

L90LS


Single Spool Valve EC OperatedShowing Service Line Relief / Anti- cavitation Cartridges &

Counter-pressure valve in Outlet Section

A B PS

T

L.S.

P

L.S.P.P2

TP

MPT3

COUNTER PRESSUREVALVE

L90LS


T3

T2/MP

TP

PS

LSP

Outlet Section Showing Pressure Reducing For Pilot Supplyand Counterpressure Valve

L90LS Outlet Section


Load sense valve LS and/or CFC

Spool in neutral position

L90LS


Load sense valve LS and/or CFC Spool in outer position

*PBAT = Pump to motorport B. Motorport A to tank.

L90LS


25

50

75

100

0

20 40 60 80 100%

FL

OW

(L

PM

)

SPOOL STROKE

Metering to Motor Port Versus Spool Stroke

L90LS


20

40

60

80

100

0

0 100 200 300

FL

OW

(L

PM

)

DIFFERENTIAL PRESSURE ( Bar )

Performance of Individual Compensator AgainstDifferential Pressure from Valve Inlet to Motor Port

L90LS


Load sense valve LS and/or CFCwith pressure feedback on B-side


L90LS



Load sense valve LS and/or CFC

with LS-logic

L90LS


T

L.S.

P

PS

T2

L.S.P.

P2T3

TP

A B A B

Two spool valve with M10 manifold

L90LS


M10 Manifold Section

L90LS


FEATUREFEATURE ADVANTAGEADVANTAGE BENEFITBENEFIT

STACKABLE

VALVE.FLEXIBILITY.

EASIER TO INSTALL.CHEAPER TO SERVICE.

MODULAR

CONSTRUCTION.

SIMPLIFICATION

FEWER EXTERNAL

COMPONENTS.

RELIABILITY.EASIER TO INSTALL SYSTEM.

LOAD SENSING

WITH

VARIABLE PUMP.

SIMPLE DESIGN

HIGHER MACHINE

PERFORMANCE.

HIGHER

WORKING CAPACITY.

BETTER FUEL ECONOMY.

OPTIMISED PERFORMANCE.

EASIER TO RETROFIT OTHER FUNCTIONS

EMERGENCY

STOP.

EASIER TO MEET

EC DIRECTIVES.

EASIER TO INSTALL.

LOWER OVERALL COST.

IMPROVED SAFETY.

IMPROVED RELIABILITY.

PRESSURE

COMPENSATION.

SIMPLE SYSTEM DESIGN& ASSEMBLY.INDIVIDUAL MAX.

SPEEDS.

NO INTERFERENCE

BETWEEN FUNCTIONS.

FEED REDUCEREASY TO SET DIFFERENT

FORCE LEVELS.EASILY INSTALLED

INCREASED EFFICIENCY.

SAFER OPERATION.

LOWER INSTALLATION COST

L90LS


FEATUREFEATURE ADVANTAGEADVANTAGE BENEFITBENEFIT

FORCE CONTROL

IMPROVED STABILITY & SAFETYLESS WEAR & GREATER EFFICIENCY.LOWER RUNNING COSTS.

MORE GENTLE MACHINECHARACTERISTICS

.

PREVENTS HIGH PEAK PRESSURES. PORT RELIEF’S CAN BE SET CLOSE TO MAX. WORKING PRESSURE.

LESS STRESS ON MACHINE COMPONENTS.IMPROVED RELIABILITY..

COUNTER -PRESSURE VALVES

LESS RISK OF CAVITATIONSIMPLY TO INSTALL.ENABLES UNLOADED LOWERING.

IMPROVED MACHINE PERFORMANCE. LESS RISK OF CYLINDER OR MOTORDAMAGE. IMPROVED FUEL ECONOMY

PROVISION FOREXTERNALPILOT FILTER

GREATER FLEXIBILITY.EASIER TO KEEP PILOTSYSTEM COMPLETELYCLEAN.

IMPROVED RELIABILITY.LOWER INSTALLATION COST

FAST ACTINGLEAK TIGHTPORTRELIEF VALVES

FUNCTIONADAPTEDSPOOLS

EASY TO OPTIMISE MACHINEPERFORMANCE WITH

FEWER COMPONENTS

IMPROVEDCONTROLLABILITY,SAFETY & RELIABILITY.

PILOT PRESSURE

SUPPLY.

SIMPLE SYSTEMASSEMBLY.

FEWER COMPONENTS

LOWER INSTALLATIONCOST.

IMPROVED RELIABILITY.

L90LS

Documents

Mobile Controls Division 01/05/2015 Constant Flow Open Centre System “CFO” Spool in neutral Activated spool Typical flow characteristic Manually controled