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2. Parker is the global leader in motion and control technologies, partnering with its customers to increase their productivity and profitability.

3. Load-Sense Pressure Compensated Valve with Flow-Sharing (Post-Compensated)
3rd Generation post-compensated valve
Target Launch – October 2006

4. 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

5. Model Logic V = valve P = lspc (post-compensated)
170 = max work section flow in LPM
Remember the VO40:
O = open center
40 = max work section flow in plum

6. 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

7. Key Market Drivers Improved machine controllability and productivity
Horsepower utilization, due tier II and III engines
Fuel cost

8. Target Markets Wheel loaders and dozers Cranes
Launched to Deere September 2004 for J Series Loaders
Cranes
Forestry – loaders, feller-bunchers, harvesters, forwarders, skidders
Refuse – side loaders
Snow and ice
Distribution

9. Competitors Post-Compensated Pre-Compensated Danfoss – PVG100 (new)
Husco – SX180 (new)
Rexroth – SX14? (have not seen in dist’n channel)
Rexroth - M4-15 (120 lpm out of work section)
Pre-Compensated
MP18 and MP22 (being discontinued; Wooster closing)

10. 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

11. Flow-Sharing Example #1

12. Flow-Sharing - Example #1 Full pump flow is 40 GPM, but operator wants 46 GPM
Work section flows at full pump displacement of 40 GPM
Operator wants 40 GPM from two work sections
But now operator wants 46 GPM
Only 40 GPM available, so valve goes into over-demand and divides the pump flow accordingly

13. Flow-Sharing - Example #2

14. Flow-Sharing - Example #2 Engine RPM decreases flow from 40 GPM to 30 GPM
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

15. Improved Efficiency of PCLS10 20 30 40 50 60
500
1000
1500
2000
2500
3000
3500
Pressure F l o w
Power consumed
by function
Wasted power
L.S. system

16. 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.”

17. Modular Design Offers Three Circuit Options
Induced load/
transition ck
Compensator
2. Load-sense pressure scompensated (PCLS) w/o induced load protection
1. Load-sense pressure compensated (PCLS) with induced load protection
Load sense ck for all circuit options located between the work ports!!!

18. Modular Design Offers Three Circuit Options
Transition ck
3. Load-sense only
Load sense ck for all circuit options located between the work ports !!!

19. Circuit – PCLS with Induced Load Protection
Pressure compensated load-sense (PCLS)
w/ reverse flow check

20. Circuit – PCLS without Induced Load Protection
Pressure compensated load-sense (PCLS)
w/o reverse flow check

21. Load-sense valve circuit
Circuit – LS only
Load-sense valve circuit

22. Low Loop Pressure Drop Ports A/B - tank

23. Spool Options Types Flows 3 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

24. Inlet Options

25. Inlet Options

26. Outlet Options

27. 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

28. Robust Endurance and fatigue testing:
Inlet, work sections and outlet fatigue 6250 PSI and 3M cycles – NO FAILURES
Load-sense checks endurance 5000 PSI and 2M cycles – NO FAILURES
Transition/induced load check 5000 PSI and 1M cycles – NO FAILURES

29. 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
Tank

30. 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

31. 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

32. 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

33. VP170 Product Launch Literature Product Catalog HY14-2006/US
Overview Bulletin HY /US  
Service Bulletin HY M1/US
Catalog CD HY /US
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