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Parker is the global leader in

motion and control technologies,

partnering with its customers to increase

their productivity and profitability.

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• 3rd Generation post-compensated valve• Target Launch – October 2006

Load-Sense Pressure Compensated Valve

with Flow-Sharing(Post-Compensated)

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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

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Model Logic

V = valveP = lspc (post-compensated)170 = max work section flow in LPM

Remember the VO40:V = valveO = open center40 = max work section flow in plum

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Key Features & Benefits

• Flow-sharing for improved productivity, safetyand 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

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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 (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)

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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

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Flow-Sharing Example #1

Max Pump Flow WS 1 WS 2 40 gpm 28 gpm 12 gpm

Scenario #1 - operator wants more speed from WS 1

WS 1 WS 2 Req PumpReq Flow Req Flow Flow

34 gpm 12 gpm 46 gpm

Overdemand = 40/46 = .87, so reduce flows by 13%

Max PumpActual WS Flow WS 1 WS 2 Flow.87 x 34 gpm for WS 1 29.6 gpm 10.4 gpm 40 gpm.87 x 12 gpm for WS 2

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Flow-Sharing - Example #1 Full pump flow is 40 GPM, but

operator wants 46 GPM

Work sectionflows at full pump displacementof 40 GPM

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12

34

12

29.6

10.4

0

5

10

15

20

25

30

35

GP

M

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

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Flow-Sharing - Example #2

Max Pump Flow WS 1 WS 2 40 gpm 28 gpm 12 gpm

Scenario #2 - engine rpm's decrease

Max Pump Flow30 gpm

Overdemand = 30/40 = .75, so reduce flows by 25%

Actual WS Flow WS 1 WS 2.75 x 28 gpm for WS 1 21 gpm 9 gpm.75 x 12 gpm for WS 2

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Flow-Sharing - Example #2 Engine RPM decreases flow

from 40 GPM to 30 GPM

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12

21

9

0

5

10

15

20

25

30

GP

M

Operator wants 40 GPM from two work sections

Engine rpm’s drop so max pump flow is 30 GPM; valve divides the flow accordingly

Work sectionflows at full pump displacementof 40 GPM

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Improved Efficiencyof PCLS

0

10

20

30

40

50

60

0 500 1000 1500 2000 2500 3000 3500

Pressure

Flow

Power consumed by function

Wasted powerL.S. system

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Improved Efficiencyof 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

Load sense ck for all circuit options located between the work ports!!!

Induced load/transition ck

Compensator

2. Load-sense pressure scompensated (PCLS) w/o induced load protection

Compensator

1. Load-sense pressure compensated (PCLS) with induced load protection

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Modular Design Offers Three Circuit Options

3. Load-sense only

Transition ck

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 DropPorts A/B - tank

Workport to Tank Delta P - Section #2

0

50

100

150

200

250

300

0 10 20 30 40 50 60 70 80 90

Flow (gpm)

Pre

ssu

re (

psi

)

0.0

5.0

10.0

15.0

20.0

0.0 50.0 100.0 150.0 200.0 250.0 300.0

Flow (lpm)

Pre

ssu

re (

bar

)

VG20 & V40

VG35

V42

VP170

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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

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Inlet Options

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Outlet Options

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Low Pressure Regeneration

• Low pressure regeneration– Addresses cavitation

• Cavitation wreaks havoc on hydraulic components and results in spongymachine 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 BTank

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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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• http://www.parker.com/hydraulicvalve– Complete product information

– Applications

– Systems and subsystems

Hydraulic Valve SolutionsFor Mobile & Truck Applications

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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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Thank You!

Parker, your singlesource for all your

Hydraulic ValveSolutions.