Ingen bildrubrik

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
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
System with fixed pump and LS valve
THREE FUNCTIONS WITHOUT INDIVIDUAL PRESSURE
COMPENSATORS
5
PRESSURE COMPENSATOR
INDIVIDUAL COMPENSATOR WITH PRESSURE REDUCTION
FUNCTION OR FEED REDUCTION FUNCTION
6
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
Arial lift
Forest machine Excavator Backhoe loader
Refuse collector Large wheel loader
Hook loader
Great demands for productivity
9
System with variable pump and LS
Suitable when

• 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
  

10
Save energy, design advises

• 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.

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
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
L.S. LOGIC CHECK VALVE
COPY SPOOL
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
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
L90LS
Metering to Motor Port Versus Spool Stroke
34
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
L90LS
Two spool valve with M10 manifold
38
L90LS
M10 Manifold Section
39
L90LS
40
L90LS