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Bulletin 90050-C

Fluid Power Reference Handbook

DISCLAIMER

The publisher of this handbook obtained the information and calculations within from a widevariety of public and private sources. The publisher disclaims any warranty, express orimplied, for any information or calculation contained in the publication, and furtherdisclaims any liability for damage or loss, including consequential damages, as a result of theuse of any information provided within this publication. Whenever the reader intends to useany information or calculation contained in this publication, the reader should independentlyverify that information or calculation and whether or not it is suitable for the reader’sintended purpose.

The publisher does not endorse or recommend, expressly or implicitly, any brand nameproduct by including such brand name products in this publication. Conversely, thepublisher does not disprove, expressly or implicitly, any brand name product by notincluding such brand name products in this publication.

EDITOR’S NOTE

Oilgear would like to thank Hydraulic and Pneumatics Magazine, the National Fluid PowerAssociation (NFPA), the Society of Automotive Engineers (SAE), the American Society ofMechanical Engineers (ASME), the National Electric Manufacturers Association (NEMA), and theInternational Organization for Standardization (ISO) for their assistance in making this publicationpossible.

Oilgear Fluid Power Reference Handbookii

Table of Contents

Section 1Conversion Factors .......................................................................................... 1Abbreviations, Prefixes and Letter Symbols ..................................................... 6Metric Units ...................................................................................................... 7Fluid Power Formulas ...................................................................................... 8Vehicle Drive Formulas .................................................................................. 10CV Calculations .............................................................................................. 12Orifice Calculations & Pressure Drops ........................................................... 13Cylinder Push/Pull Forces ............................................................................... 17Cylinder Speeds ............................................................................................. 18Fluid Motor Torque .......................................................................................... 19RAM Capacities ............................................................................................. 21Pressure Losses in Piping .............................................................................. 22Nominal Working Pressures ............................................................................ 30O-Ring Material Specifications ........................................................................ 34Seals and Seal Compatibility ......................................................................... 44Accumulator Formulas ................................................................................... 45Viscosity Conversions & Calculations ............................................................ 50Fastener Torques ........................................................................................... 52Water Hammer ............................................................................................... 55

Section 2Reservoir Design ............................................................................................ 56Noise Abatement ............................................................................................. 57Fluid Conditioning .......................................................................................... 60Heat Transfer ................................................................................................. 68Pipe Bending .................................................................................................. 69Pump Inlet Conditions ..................................................................................... 70Accumulator Theory and Solutions ................................................................ 71

Section 3Flange Ports ................................................................................................... 72Valve/Mounting/Surface Dimensions .............................................................. 80Pump/Mounting/Drive Dimensions ............................................................... 104Selection and Application of Induction Motors ............................................. 109NEMA Electric Motor Standards .................................................................. 110Electric Motor Horsepower ........................................................................... 118ANSI Standards for Stationary Equipment ................................................... 119Graphic Symbols and Circuit Diagrams ........................................................ 140

AppendixAccumulators ................................................................................................ A-1Reservoirs ..................................................................................................... A-7Hydraulic Fluids ........................................................................................... A-11Hydraulic Contamination ............................................................................. A-18Hydraulic Filtration ...................................................................................... A-23Heat Exchangers ......................................................................................... A-35Fittings ......................................................................................................... A-39Hydraulic Hose ............................................................................................ A-42Hose Installation .......................................................................................... A-47Seals and Sealing Technology .................................................................... A-50Glossary of Standard Terms and Words ..................................................... A-59

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Oilgear Fluid Power Reference Handbook 1

Oilgear Fluid Power Reference Handbook2

UNITS

Dimensions are given in millimeters.Inch dimensions shown below the millimeter conform to ISO 4412-1.

LETTER SYMBOLS

For the purpose of this standard, the following symbols apply:

a) A, B, P, T, L, V, X and Y identify ports in accordance with ISO 9461;b) F

1, F

2, F

3, F

4, F

5 and F

6 identify threaded holes for mounting fasteners; and

c) G1, and G

2 identify location pin holes.

MOUNTING SURFACE IDENTIFICATION CODING

The following prefixes relate to the mounting surface valve type:

C = is the non-return (check) valveD = is the directional control valveFB = is the cam-actuated two-stage compensated flow control valveF, 2F, 3F = are the compensated flow control valvesP = is the pressure control valve (other than the relief valve),

sequence valve, throttle valve and non-return (check) valve.POC = is the pilot operated valvesR, RP, RV= are the pressure relief valves

TOLERANCES

The following tolerances shall apply, unless otherwise specified in table.

Surface roughness (RT)

NOTE: See ISO 4287 and ISO 4288 for further surface roughness tolerances.

Surface Flatness:0.01 mm over a distance of 100 mm(.0004 inch over a distance of 4inches)

NOTE: See ANSI/Y14.5M for furthersurface flatness tolerances

Hydraulic Fluid Power Valves - Mounting SurfacesNFPA/T3.5.1 R2-2002


Holes and Tolerances on p. 81

and Tolerances

Oilgear Fluid Power Designers' Handbook


172

Oilgear Fluid Power Reference Handbook Appendix-1

Oilgear Fluid Power Reference HandbookAppendix-2

AUSTRALIAOilgear Towler Australia Pty. Ltd.

BRAZILOilgeardo Brazil Hydraulica Ltd.

CANADAThe Oilgear Company

FRANCEOilgear Towler S.A.

GERMANYOilgear Towler GmbH

INDIAOilgear Towler Polyhydron Pvt. Ltd.Towler Automation Pvt. Ltd.

ITALYOilgear Towler S.r.l.

JAPANThe Oilgear Japan Company

KOREAOilgear Towler Korea Co. Ltd.

MEXICOOilgear Mexicana S.A. de C.V.

SPAINOilgear Towler S.A.

TAIWANOilgear Towler Taiwan Co. Ltd.

UNITED KINGDOMOilgear Towler Ltd.

UNITED STATES OF AMERICAThe Oilgear Company

World HeadquartersThe Oilgear Company2300 South 51st Street Milwaukee, WI USA 53219phone: 414/327-1700 fax: 414/327-0532

www.oilgear.com

For more information about your application or the productsin this brochure, please contact your nearest Oilgear facility.

Bulletin 90050-CIssued February 2005Printed in USA

Download - Oilgear Designers Handbook

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