Fluid Power Circuits and Controls: Fundamentals and Applications, Second Edition, 2nd Edition (Hardback) book cover

Fluid Power Circuits and Controls

Fundamentals and Applications, Second Edition, 2nd Edition

By John S. Cundiff, Michael F. Kocher

CRC Press

556 pages | 385 B/W Illus.

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Hardback: 9781498770019
pub: 2019-12-20
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Fluid Power Circuits and Controls: Fundamentals and Applications, Second Edition, encourages students to think of the collection of components as a system. This allows students to apply what they've learned, and to consider how the component operating characteristics interact with the rest of the circuit. The Second Edition offers many new worked examples, and additional exercises and problems in each chapter. Half of these new problems involve basic analysis of specific elements, and the rest are design-oriented, involving analysis of system behavior or performance. A complete Solutions Manual is available for qualified adopting instructors.


"The new edition of Fluid Power Circuits and Controls provides a much-needed contemporary educational resource on this very important subject. Concise, but complete, this book will help students and practicing engineers develop a solid basic understanding of both the theoretical and practical engineering aspects of fluid power."

- John K. Schueller, University of Florida, USA

"In the textbook Fluid Power Circuits and Controls, John Cundiff and Michael Kocher, present a consistently complete, and practical, treatment of hydraulic system concepts, with illustrations, and examples that make system analysis and design understandable without glossing over details which often get omitted from texts of this level. Fluid Power textbooks that provide clear and complete examples like this are hard to find. I have been designing fluid power systems for 35 years and teaching it for 14 years, and I wish that I had this text when I first began learning about fluid power."

Keith Fisher, Montana State University, USA

Table of Contents

  1. Brief Overview of Fluid Power
    1. Introduction
    2. Concept of Fluid Power
    3. Troubleshooting
    4. Summary

  2. Fluid Power Basics
    1. Introduction
    2. Fluid Statics
    3. Conservation of Mass
    4. Functions of a Working Fluid
    5. Fluid Properties
    6. Bernoulli’s equation
    7. Flow in Lines
    8. Leakage Flow
    9. Orifice Equation
    10. Troubleshooting
    11. Summary

    Appendix A2.1 Data for Selected Hydraulic Fluids

  3. Pressure Control
    1. Introduction
    2. Review of Needed Symbols
    3. Relief Valve
    4. Unloading Valve
    5. Sequence Valve and Pressure-Reducing Valve
    6. Counterbalance Valve
    7. Pressure Analysis
    8. Installation Techniques
    9. Troubleshooting
    10. Summary

  4. Creation and Control of Fluid Flow
    1. Introduction
    2. Flow Control Valves
    3. Circuits Using Flow Control Valves
    4. Fixed Displacement Pumps
    5. Fixed Displacement Pump Circuits
    6. Variable Displacement Pump Circuits
    7. Comparison of Pump Performance Characteristics for Three Main Designs
    8. Pump Mounts
    9. Flow Dividers
    10. Practical "Tips" in design
    11. Summary

  5. Rotary Actuators
    1. Introduction
    2. Stall Torque Efficiency
    3. Typical Performance Data for a Gerotor Motor
    4. Comparison of Motor Performance Characteristics for Three Main Designs
    5. Performance Characteristics of Low-Speed, High-Torque Motors
    6. Design Examples for Motor Application
    7. Interaction of Pump and Motor Characteristics
    8. Bent Axis Motors
    9. Motor-Gearbox Combinations
    10. Oscillating Actuator
    11. Summary

    Appendix A5.1 Curve Fitting Technique

  6. Hydrostatic Transmissions
    1. Introduction
    2. Mechanical Transmissions
    3. Introduction to Hydrostatic Transmissions
    4. Hydrostatic Transmissions for Vehicle Propulsion
    5. Different Configurations of Hydrostatic Transmissions to Propel Vehicles
    6. Classification of Hydrostatic Transmissions
    7. Closed-Circuit Hydrostatic Transmissions
    8. Closed-Circuit, Closed-Control-Loop Hydrostatic Transmissions
    9. Hydrostatic Transmission Design
    10. Summary

    Appendix A6.1 Basic Concepts in Traction

    Appendix A6.2 Selected Catalog Data for Hydrostatic Transmission Design Problems

  7. Linear Actuators
    1. Introduction
    2. Analysis of Cylinders in Parallel and Series
    3. Synchronization of Cylinders
    4. Cushioning
    5. Re-phasing of Cylinders
    6. Presses
    7. Pressure Intensification
    8. Load Analysis
    9. Types of Cylinders
    10. Cylinder Construction
    11. Cylinder Friction
    12. Summary

    Appendix A7.1 MATLAB Program for Numerical Analysis of Acceleration of a Vertical Cylinder Lifting a Load Weighing 17. kN (See Sec. 7.8.1)

  8. Temperature and Contamination Control
    1. Introduction
    2. Temperature Control
    3. Contamination Control
    4. Summary

  9. Auxiliary Components
    1. Introduction
    2. Reservoir
    3. Accumulators
    4. Hydraulic Lines
    5. Fluid Velocity in Conductors
    6. Options for Connecting Components
    7. Installation of Lines
    8. Design Life of Components
    9. System Integration
    10. Summary

    Appendix A9.1 Selected Design Data for Fluid Conductors

  10. Pneumatics
    1. Introduction
    2. Pressure Drops: Orifice Equation and Line Friction
    3. Compressors
    4. Cooling
    5. Receiver
    6. Preparation of Compressed Air
    7. Cylinders
    8. Motors
    9. Additional Actuator Units
    10. Valves
    11. Summary

    Appendix A10.1 Standard Conditions

  11. Proportional Valves
    1. Introduction
    2. Review of Key Parameters
    3. Proportional Pressure Control
    4. Proportional Flow Control
    5. Poppet Style Flow Controls
    6. Proportional Directional Control
    7. Application of Proportional Flow Control
    8. Summary

  12. Servo Valves
    1. Introduction
    2. Concept
    3. Basic Analysis
    4. Specifications Supplied by Manufacturer
    5. Control of Pump Displacement
    6. Basic Servo Systems
    7. Servo Valve Construction
    8. Valve Performance
    9. Types of Servo Systems
    10. Servo Amplifiers
    11. Servo Analysis
    12. Additional Concepts
    13. Summary

About the Authors

John S. Cundiff received his PhD in Biological and Agricultural Engineering from North Carolina State University in 1972. His academic career began at the University of Georgia where his early research was on tobacco transplant mechanization, thus beginning his interest in the use of hydraulics on mobile machines. He joined the faculty at Virginia Tech in 1980 and in 1987 began teaching an undergraduate engineering course, "Fluid Power Systems and Circuits". The 1st edition of this textbook, published in 2002, evolved out of 15 years teaching this course.

Dr. Cundiff retired in 2010, thus concluding a 38-year academic career. His early retirement years were spent finishing two research projects. In 2016, after obtaining an agreement from Dr. Mike Kocher to be co-author (and thus do most of the work), he undertook this 2nd edition project.

Dr. Cundiff is married to Karen, and together they have four children, two from her first marriage and two from his. Together, they have seven grandchildren.

Michael F. Kocher received B.S. and M.S. degrees in Agricultural Engineering from the University of Nebraska-Lincoln in 1979 and 1983, respectively. Mike received his Ph.D. in Agricultural Engineering from Oklahoma State University in 1986. His academic career began with the Agricultural and Biological Engineering Department at the University of Arkansas with a research and teaching appointment focusing in power and machinery. In 1990, Mike joined the Department of Biological Systems Engineering at the University of Nebraska-Lincoln with a 60% teaching and 40% research appointment. During his first year at UNL, Mike began teaching the "Power Systems Design" course with about three-fourths of the course devoted to fluid power hydraulics. In 2002 Mike was excited to adopt the 1st edition of this textbook for the course as it had a focus on design, extending beyond the basic analysis of so many other textbooks.

Dr. Kocher is married to Jodi, and they have four wonderful children and a wonderful daughter-in-law. Mike and Jodi are both licensed professional engineers.

About the Series

Mechanical and Aerospace Engineering Series

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Subject Categories

BISAC Subject Codes/Headings:
TECHNOLOGY & ENGINEERING / Industrial Design / General