# Fluid Power Circuits and Controls

## Fundamentals and Applications, 1st Edition

CRC Press

560 pages | 330 B/W Illus.

Hardback: 9780849309243
pub: 2001-06-28
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### Description

Engineers not only need to understand the basics of how fluid power components work, but they must also be able to design these components into systems and analyze or model fluid power systems and circuits. There has long been a need for a comprehensive text on fluid power systems, written from an engineering perspective, which is suitable for an undergraduate-level course in fluid power.

Fluid Power Circuits and Controls: Fundamentals and Applications encourages students to think of the collection of components as a system. The author illustrates each concept with a circuit diagram, and as each component is discussed, immediately places it in a circuit and analyzes its performance. This approach allows students to immediately apply what they have learned and encourages them to think about how the component operating characteristics interact with the rest of the circuit.

Covering all aspects of the industry, this book:

• Develops the basic concept for power delivery with fluids

• Reviews basic concepts of fluid mechanics and discusses the key properties of the fluids

• Discusses the creation and control of flow and the various methods used to control pressure in a circuit

• Provides a detailed example of the classic problem of hydrostatic transmission design

• Presents characteristics of auxiliary components and applicable SAE standards

• Addresses pneumatics, focusing on the difference in power transmission for liquid and gas

• Discusses servo valves and proportional valves without requiring a background in automatic controls

The text is richly illustrated, filled with fully worked example problems, and reinforced with exercises in each chapter. Fluid Power Circuits and Controls offers valuable design experience and the background its readers need to approach real-world fluid power problems with confidence.

Preface

BRIEF OVERVIEW OF FLUID POWER

Introduction

Concept of Fluid Power

Summary

FLUID POWER BASICS

Introduction

Fluid Statics

Functions of a Working Fluid

Fluid Properties

Flow in Lines

Leakage Flow

Orifice Equation

Summary

Data Selected for Hydraulic Fluids

PRESSURE CONTROL

Introduction

Review of Needed Symbols

Relief Valve

Sequence Valve and Pressure-Reducing Valve

Counterbalance Valve and Brake Valve

Summary

CREATION AND CONTROL OF FLUID FLOW

Introduction

Fixed Displacement Pumps

Fixed Displacement Pump Circuits

Variable Displacement Pump Circuits

Comparison of Pump Performance Characteristics for Three Main Designs

Multiple Pump Circuits

Pump Mounts

Flow Control Valves

Circuits Using Flow Control Valves

Summary

ROTARY ACTUATORS

Introduction

Stall Torque Efficiency

Typical Performance Data for a Gear motor

Comparison of Motor Performance Characteristics for Three Main Designs

Performance Characteristics of Low-Speed, High-Torque Motors

Design Example for Gear Motor Application

Interaction of Pump and Motor Characteristics

Bent Axis motors

Motor-Gearbox Combinations

Oscillating Actuator

Summary

Curve Fitting Technique

HYDROSTATIC TRANSMISSIONS

Introduction

Mechanical Transmissions

Introduction to Hydrostatic Transmissions

Hydrostatic Transmissions for Vehicle Propulsion

Different Configurations of Hydrostatic Transmissions to Propel Vehicles

Classification of Hydrostatic Transmissions

Closed-Circuit Hydrostatic Transmissions

Closed-Circuit, Closed-Loop Hydrostatic Transmissions

Hydrostatic Transmission Design

Summary

Basic Concepts in Traction

Selected Catalog Data for Hydrostatic Transmission Design Problems

LINEAR ACTUATORS

Introduction

Analysis of Cylinders in Parallel and Series

Synchronization of Cylinders

Cushioning

Rephasing of Cylinders

Presses

Types of Cylinders

Cylinder Construction

Summary

TEMPERATURE AND CONTAMINATION CONTROL

Introduction

Temperature Control

Contamination Control

Summary

AUXILIARY COMPONENTS

Introduction

Reservoir

Hydraulic Lines

Fluid Velocity in Conductors

Options for Connecting Components

Installation of Lines

Design Life of Components

System Integration

Summary

Selected Design Data for Fluid Conductors

PNEUMATICS

Introduction

Orifice Equation

Compressors

Pipelines

Preparation of Compressed Air

Cylinders

Motors

Valves

Summary

Standard Conditions

SERVO VALVES

Introduction

Concept

Servo Valve Construction

Valve Performance

Types of Servo Systems

Servo Amplifiers

Servo Analysis

Summary

PROPORTIONAL VALVES

Introduction

Types of Proportional Valves

Analysis of Proportional Directional Control Valve

Comparison of Servo and Proportional Valves

Summary

Summary of Equations

Index