Parker负载敏感阀培训(L90LS)

50
100
200
50 200 56 6 BAR 210 210 106 6 BAR
100 206 6 BAR 210
200
210
THREE FUNCTION WITH INDIVIDUAL PRESSURE COMPENSATORS
Mobile Controls Division
30/03/2012
30/03/2012
Mobile Controls Division
K170LS/K220LS /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
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
50
100
200
50 200 210
100
200
210
210
210
210
210
210
THREE FUNCTIONS WITHOUT INDIVIDUAL PRESSURE COMPENSATORS
Mobile Controls Division
30/03/2012
PRESSURE COMPENSATOR
manual - pneumatic prop & on-off - hydraulic - electro-hydraulic prop & onoff
-
Two speed control Lever release function
Pressure compensators Application adapted spools
Mobile Controls Division
30/03/2012
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
Mobile Controls Division
30/03/2012
LS - Valve Range
For systems with variable displacement pu0-350
K220LS
100-250
L90LS
50-130
0
100
200
Refuse collector Large wheel loader
Great demands for productivity
Mobile Controls Division
30/03/2012
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
Mobile Controls Division
30/03/2012
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.
Constant Flow Open Centre System “CFO”
Mobile Controls Division
30/03/2012
System with variable pump
Spool in mid position
Max. Pump Flow “METER OUT” LOWERING
30/03/2012
System with fixed pump and LS valve
L90LS valve F1 + pump
Constant Flow Closed center system “CFC”
Mobile Controls Division
30/03/2012
System with fixed pump and LS valve
G1/2 - 7/8” - 14UN
-
Pump unloading inlet Built-in main & port relief valves Built-in feed reducers Copy spool function Function manifolds Spool actuators
-
Pressure compensators Application adapted spools Intermediate sections
Mobile Controls Division
30/03/2012
K170LS/K220LS /K220LS
Applications - Forest machines - Excavators - Backhoe loaders - Reach stackers - Wheel loaders - Fork lifts Customers - Timberjack - Volvo - Barko - Ponsse - Kalmar LMV
System with fixed pump
Spool in neutral Activated spool
Max. Pump Flow “METER IN” LIFTING
“METER OUT” LOWERING
100 % Spool travel
Typical flow characteristic Manually controled valve
Activated spool
“METER IN” LYFTING
Typical flow characteristic Spool travel Manual controlled valve
100 %
Load-sensing system “LS”
Closed Centre Valve
Mobile Controls Division
Mobile Controls Division
30/03/2012
L90LS
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
Mobile Controls Division
30/03/2012
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
Mobile Controls Division
30/03/2012
K170LS/K220LS
Features
- Individual pressure -
Applications well suited for ”LS”
Great demands for manoeuvrability
Arial lift
Very suitable for ”LS” Forest machine systems Excavator
Backhoe loader
Hook loader
300
400
500
600
Flow l/m in
Mobile Controls Division
30/03/2012
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
Energy comparison in systems
Systems with fixed pump ”CFO”
Systems with variable pump ”LS”
P pressure
P pressure
Q flow
Q flow
Mobile Controls Division
30/03/2012
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
PILOT STAGE
INDIVIDUAL COMPENSATOR WITH PRESSURE REDUCTION FUNCTION OR FEED REDUCTION FUNCTION
Mobile Controls Division
30/03/2012
System with fixed pump and LS valve