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2
Load-Sense
Pressure Compensated Valve
with Flow-Sharing
(Post-Compensated)
• 3rd Generation post-compensated valve
• Target Launch – October 2006
3
Specifications
• Flows
– Pump input up to 60 GPM
– Work sections up to 50 GPM
• Pressure 5000 PSI
• Sectional construction
• Max. porting
– Inlet SAE 16 top and side
– Work SAE 12
– Outlet SAE 16 top and SAE 20 side
4
Model Logic
V = valve
P = lspc (post-compensated)
170 = max work section flow in LPM
Remember the VO40:
V = valve
O = open center
40 = max work section flow in plum
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Key Features & Benefits
• Flow-sharing for improved productivity, safety
and operator comfort
• Load-sense pressure compensated for improved
system efficiency and fuel savings
• Modular design enables better match between
cost and value. Available with:
– Load-sense pressure compensated, with or
without induced load protections
– Load-sense only
• Low loop pressure drops for reduced HP
consumption
• Low pressure regeneration to solve cavitation
problems of premature component failure and
“spongy” operation
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Key Market Drivers
• Improved machine controllability and
productivity
• Horsepower utilization, due tier II and III
engines
• Fuel cost
7
Target Markets
• Wheel loaders and dozers
– Launched to Deere September 2004
for J Series Loaders
• Cranes
• Forestry – loaders, feller-bunchers,
harvesters, forwarders, skidders
• Refuse – side loaders
• Snow and ice
• Distribution
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Competitors
• Post-Compensated
– Danfoss – PVG100
– Husco – SX180
(new)
(new)
– Rexroth – SX14?
– Rexroth - M4-15
(have not seen in dist’n channel)
(120 lpm out of work section)
• Pre-Compensated
– MP18 and MP22
(being discontinued; Wooster closing)
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Flow-Sharing
Adjusts to a pump over-demand conditions
by reducing the flow to the selected
functions, while maintaining the speed
relationship between those functions
The benefit - the operator can maintain
the control of the machine
The result - increased productivity,
improved safety and operator comfort
10
Flow-Sharing Example #1
Max Pump Flow
40 gpm
WS 1
WS 2
28 gpm
12 gpm
Scenario #1 - operator wants more speed from WS 1
WS 1
WS 2 Req Pump
Req Flow Req Flow
Flow
34 gpm
12 gpm
46 gpm
Overdemand = 40/46 = .87, so reduce flows by 13%
Actual WS Flow
.87 x 34 gpm for WS 1
.87 x 12 gpm for WS 2
WS 1
WS 2
Max Pump
Flow
29.6 gpm
10.4 gpm
40 gpm
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Flow-Sharing - Example #1
Full pump flow is 40 GPM, but
operator wants 46 GPM
34
35
30
29.6
28
25
GPM
20
15
12
12
10.4
10
5
0
Work section
flows at full pump
displacement
of 40 GPM
Operator
wants 40
GPM from
two work
sections
But now
operator
wants 46
GPM
12
Only 40 GPM available,
so valve goes into overdemand and divides the
pump flow accordingly
Flow-Sharing - Example #2
Max Pump Flow
40 gpm
WS 1
WS 2
28 gpm
12 gpm
Scenario #2 - engine rpm's decrease
Max Pump Flow
30 gpm
Overdemand = 30/40 = .75, so reduce flows by 25%
Actual WS Flow
.75 x 28 gpm for WS 1
.75 x 12 gpm for WS 2
WS 1
WS 2
21 gpm
9 gpm
13
Flow-Sharing - Example #2
Engine RPM decreases flow
from 40 GPM to 30 GPM
30
28
25
21
GPM
20
15
12
9
10
5
0
Work section
flows at full pump
displacement
of 40 GPM
Operator
wants 40
GPM from
two work
sections
Engine rpm’s drop so max pump
flow is 30 GPM; valve divides the
flow accordingly
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Improved Efficiency
of PCLS
60
50
40
F
l
30
o
w
20
Wasted power
L.S. system
Power consumed
by function
10
0
0
500
1000
1500
2000
2500
Pressure
15
3000
3500
Improved Efficiency
of PCLS
“A big reason for the change by Deere was
mounting fuel costs. The pressure
compensated load-sensing variable
displacement system is a lot more fuel efficient
than the open-center system, depending on
operation, by as much as 30, 40, or even 50%
better,” says Anders Lindstrom, Senior
Systems Engineer with Parker Hannifin.
“With the fuel savings I get on two of my
437Cs, I can make the payment on one.”
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Modular Design Offers
Three Circuit Options
Induced load/
transition ck
Compensator
1. Load-sense pressure
compensated (PCLS) with
induced load protection
Compensator
2. Load-sense pressure
scompensated (PCLS)
w/o induced load protection
Load sense ck for all circuit
options located between the work ports!!!
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Modular Design Offers
Three Circuit Options
Transition ck
3. Load-sense only
Load sense ck for all circuit
options located between the work ports !!!
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Circuit – PCLS with
Induced Load Protection
Pressure compensated load-sense (PCLS)
w/ reverse flow check
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Circuit – PCLS without
Induced Load Protection
Pressure compensated load-sense (PCLS)
w/o reverse flow check
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Circuit – LS only
Load-sense valve circuit
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Low Loop Pressure Drop
Ports A/B - tank
Workport to Tank Delta P - Section #2
Flow (lpm )
0.0
50.0
100.0
150.0
200.0
250.0
300.0
300
20.0
250
VG20 & V40
V42
15.0
150
10.0
VP170
100
5.0
VG35
50
0
0.0
0
10
20
30
40
50
Flow (gpm )
22
60
70
80
90
Pressure (bar)
Pressure (psi)
200
Spool Options
• Types
– 3 way cylinder and motor
– 4 way cylinder and motor
– 4 position float
• Flows
– Flow limited at full stroke and 250 PSI margin
• GPM 8, 16, 24, 32, 45
• Additional flow limitation can be achieved with spool
stroke limiters for ports A or B or both. Applies to
hydraulic remote and solenoid operated.
– Not flow limited
• Another spool available that falls off the notch at full
stroke and will try to output the full pump flow
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Inlet Options
24
Inlet Options
25
Outlet Options
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Low Pressure
Regeneration
• Low pressure regeneration
– Addresses cavitation
• Cavitation wreaks havoc on hydraulic
components and results in spongy
machine operation
• During valve operation, the valve will sense if a
function is cavitating and will force oil across
anti-cavitation checks to fill void
• If there is still a void in the hydraulic loop, when
spools returned to neutral – will keep pump on
stroke until a specified pressure level is achieved
in the loop
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Robust
• Endurance and fatigue testing:
– Inlet, work sections and outlet fatigue tested
@ 6250 PSI and 3M cycles – NO FAILURES
– Load-sense checks endurance tested
@ 5000 PSI and 2M cycles – NO FAILURES
– Transition/induced load check tested
@ 5000 PSI and 1M cycles – NO FAILURES
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Performance
Enhancement
• Meter-out control can
increase P-A/B pressure
drop, when opposite
port energized
• Work section body
lengthened to ensure
that pressure drop
P/A-B not affected
when meter-out
control required
Port B
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Tank
Performance
Enhancement
• 4-position float work section
– When work section is in the float
position, traditional design will draw oil
A and B tank cores
• VP170 design can draw oil from:
– Tank cores of ports A and B
– Return flow from port B
• This improves float down time
and addresses potential cavitation
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Additional Benefits
• Fly cut lands each critical area (10)
means consistent metering from
valve to valve
• Uses same spool positioners as
VA20 and PC25 — reduces cost,
risk and improves delivery
• Uses same port accessories as
FIVE other valve series –– reduces
cost, risk and improves delivery
• Spool stroke of .406" longest in
industry — this means more
metering vs. spool stroke
• One solenoid used for on/off and
proportional applications
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Summary
•
•
•
•
•
•
•
•
•
•
•
•
•
Pressures to 5000 PSI
Flow range is 8-55 gpm out of the work port
Flow-sharing
Circuit options – load-sense pressure compensated or load-sense
Optional induced load protection
Optional low pressure regen and void filling scheme
Improved filling scheme during float position (4 position float work section)
Flexible, compact and cost effective EH package
Symmetrical spool for easy conversion to right or left-handed sections
Same spool positioners and port accessories as open-center
counterparts
Stroke limiters available for hydraulic remote
and solenoid operation
Full complement of flow-limited spools available
Easily serviceable — all checks located on top
of work section
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VP170 Product Launch
• Literature
– Product Catalog HY14-2006/US
– Overview Bulletin HY14-2006/US
– Service Bulletin HY14-2006-M1/US
– Catalog CD HY14-2006/US
– Advertisement
– Product Bit
– News Release
– To order call 1-800-CPARKER
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Hydraulic Valve Solutions
For Mobile & Truck Applications
• http://www.parker.com/hydraulicvalve
– Complete product information
– Applications
– Systems and
subsystems
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Contact Us
• Phone: 440-366-5200
• Fax: 440-366-5253
• Local Parker Distributor
www.parker.com/hydraulicvalve
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Parker, your single
source for all your
Hydraulic Valve
Solutions.
Thank You!
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