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Parker is the

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leader in motion and control technologies,

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Load-Sense Pressure Compensated Valve with Flow-Sharing (Post-Compensated)

• •

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

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Specifications

• • • •

Flows

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Pump input up to 60 GPM

–

Work sections up to 50 GPM Pressure 5000 PSI Sectional construction Max. porting

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Inlet SAE 16 top and side

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Work SAE 12

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Outlet SAE 16 top and SAE 20 side

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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

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Target Markets

• • • • • •

Wheel loaders and dozers

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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)

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Husco – SX180 (new)

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Rexroth – SX14?

(have not seen in dist’n channel)

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Rexroth - M4-15 (120 lpm out of work section) Pre-Compensated

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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 40 gpm WS 1 28 gpm WS 2 12 gpm

Scenario #1 - operator wants more speed from WS 1

WS 1 Req Flow 34 gpm WS 2 Req Flow 12 gpm Req Pump Flow 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 29.6 gpm WS 2 10.4 gpm Max Pump Flow 40 gpm

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Flow-Sharing - Example #1

Full pump flow is 40 GPM, but operator wants 46 GPM 35 30 25 20 15 10 28 12 34 12 29.6

10.4

5 Work section flows at full pump displacement of 40 GPM 0 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 40 gpm WS 1 28 gpm

Scenario #2 - engine rpm's decrease

WS 2 12 gpm 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 21 gpm

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WS 2 9 gpm

Flow-Sharing - Example #2

Engine RPM decreases flow from 40 GPM to 30 GPM 30 28 25 21 20 15 10 12 9 5 Work section flows at full pump displacement of 40 GPM 0 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 F l o w 40 30 20 10 0 0 Wasted power L.S. system Power consumed by function 500 1000 1500 2000 Pressure 2500 3000 3500

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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 Compensator 1. Load-sense pressure compensated (PCLS) with induced load protection 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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150 100 50 0 0 300 0.0

Low Loop Pressure Drop Ports A/B - tank

Workport to Tank Delta P - Section #2 Flow (lpm ) 150.0

200.0

50.0

100.0

250.0

250 200 VG20 & V40 10 20 30 40 Flow (gpm ) 50 60 VG35 70 VP170 300.0

80 V42 90 0.0

20.0

15.0

10.0

5.0

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Spool Options

• •

Types

–

3 way cylinder and motor

– –

4 way cylinder and motor 4 position float Flows

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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 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 in the loop – will keep pump on stroke until a specified pressure level is achieved

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Robust

•

Endurance and fatigue testing:

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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

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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 Tank

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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

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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

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Service Bulletin HY14-2006-M1/US

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Catalog CD HY14-2006/US

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Advertisement

–

Product Bit

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News Release

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To order call 1-800-CPARKER

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Hydraulic Valve Solutions

For Mobile & Truck Applications

•

http://www.parker.com/hydraulicvalve

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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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