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派克平衡阀培训


LOAD HOLDING

Who use load holding?
Gold
Platforms:
Construction Site: Wheel Excavators Construction Mini: Mini Excavators

Platforms:

Platinium

Strategy:
Questionmark, needs probably further large investments in order to be successful. Must be reviewed together with Division, case by case, before any activities are started.

Attractiveness

Construction Site: Articulated Haulers, Asphalt Pavers, Wheel Loaders, Mobile Cranes, Construction Mini: Compact Loaders Agriculture: Vegetable Harvesters, Materials Handling: Forklifts >10 ton, Reach Stackers, Articulated Truck Cranes, Telehandlers Waste Handling: Auto Side Loaders, Auto Front Loaders, Hook Loaders, Bin Lifts Forestry: Forwarders, Harvesters, Forest Cranes, Harvesting heads Mining and Drilling: Drill Rigs

Strategy:
Main priority, willing to invest to get further business

Platforms:
Agriculture: Tractors < 40 hp, Tractors 40-99 hp, Tractors > 90 hp, Combines, Feed Truck Mixers Construction Road: Compactors Construction Site: Backhoe Loaders, Excavators, Tracked Dozers Construction Mini: Skid Steer Loaders Materials Handling: Forklifts < 5 ton, Forklifts 6-10 ton

Platforms:
Waste Handling: Rear Loaders, Skip Loaders

Strategy:
Tough competition, needs agreement with Division before any activity are started

Strategy:
Stay out, only interesting with standard products without any modifications needed and with good margin possibilities

Bronze Competitiveness

Silver

Over center functions
? ? ? ? Typical over center valves Pilot assisted over center valves Pressure setting Compensation to backpressure
– Relief function compensated – Relief and pilot function compensated

? Pilot ratio ? Pilot features ? Oscillations

Typical over center valve
To minimise internal leakage at closed valve are over center valves often seat valves.

The soft seal between pilot and inlet also contribute to minimise the leakage

Pilot assisted over center valves

Meter in flow control the speed.

Vinsch system

P

T

Avoid cavitation through ”press down the load”, ”Counterbalance valve”

Ventilated

Spring chamber connected to air pressure 150 bar

150 bar

T

Not Ventilated

Spring chamber connected down streams 150 bar

150 bar

T

Pressure setting
Pt Pc Pp = R (+k)
Pt = pressure setting Pc = load induced pressure Pp = pilot pressure R = pilot ratio k = kappa (cylinder ratio)

Pressure setting
If pilot ratio = 3:1 (54 bar ) If pilot ratio = 9:1 (20,5 bar )

Lowering a load

300 100 Pp = 3 + O,7

100 bar

300 bar

Low mechanical damping

Pilot pressure out of phase with load pressure

CVS Product Presentation Agenda:
? Cartridge Valve Product Range Overview ? Load Holding Valves ? Features & Benefits Different & Better ? Applications ? Potential Growth Opportunities

Check Valves
? -8 / -10 / -16 / -20 SAE Standard Cavity ? 38-300 LPM, 350 Bar

Solenoid Operated Check Valves
? NO & NC -8 / -10 / -16 / -20 ? 30-260 LPM, 350 Bar

PO Check Valves
? Three port valve example -12 cavity 75 LPM, 350 Bar ? Two Port valve + Pilot Piston -16 cavity 190 LPM, 350 Bar ? 3:1 Pilot Ratio, 5 drops leakage @ full rated Pressure

Dual PO Check Valves
Four port valve - 8 cavity 20 LPM Pilot Piston Type –16 cavity 190 LPM

Counterbalance Valves

MHC Range
? 4 None Std Cavities 37 – 300 LPM 350 Bar. ? Vented and Non Vented Options

MHC Body Options

Line Mounted Port Bodies MHC-025 Shown

Counterbalance Valve Stability
MHC Type CB101 Type ? Tapered poppets are superior to spherical poppets ? Avoid Valve Chatter ? Improved Stability

Applications – Tele-Handler Extension Ram
Function Manifold Regen and Load Hold

Applications – Bridge Laying System

Growth Opportunities – Market Investigation
Excavator Boom Hose Failure Valves – 44,250 valves sold in Europe During last 12 months. Do we have the products to enter this Market

MHC-050 Vented 10:1 Ratio. This can satisfy the Leakage / Pressure and Flow Requirement:

Systems and Division Support
Targeted Mobile Market Opportunities

Complete Systems Support Product Application And Manifold Design

Specific OEM Solution

Integration of cartridges into cylinders

Summary - Any Questions

Thank You


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