Valves – How Industrial Components Work
A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller
This allows direct flow control and subsequent control of process variables such as pressure, temperature and liquid level.
In automatic control terminology, a control valve is called a "final control element."
More information on valves
Inquiry about valves and spare parts at Unitec:
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Buy books
Electric Motors and Drives: Fundamentals, Types and Applications
Best-selling reference book on electric motors and drives for non-specialists, bridging the gap between mathematics and theory.
Mechanical Design of Electric Motors
Rapid increases in energy consumption and emphasis on environmental protection have posed challenges for the motor industry, as has the design and manufacture of highly efficient, reliable, economical, energy-saving, quiet, precisely controlled and durable electric motors.
Suitable for motor designers, engineers and manufacturers, as well as maintenance personnel, undergraduate and graduate students and academic researchers, Mechanical Design of Electric Motors provides in-depth knowledge of cutting-edge design methods and developments in electric motors. From motor classification, motor component design, model configuration, and material and bearing selection, to power losses, motor cooling, design integration, vibration, and acoustic noise, this comprehensive text covers the fundamentals, practical design, and design issues, modeling and simulation, engineering analysis, manufacturing processes, test procedures, and performance characteristics of today's electric motors.
With a focus on the mechanical design of modern electric motors, the book:
Details the design and manufacturing of major components and subsystems, such as rotors, shafts, stators and frames
Examines various cooling techniques, including forced air, liquid, and phase change
Discusses the analysis and calculation of engine power losses
Addresses engine vibration and acoustic noise issues
Presents technical analysis methods and case study results
Highlights construction, optimization and applications
Presenting research findings from the author's personal experience and significant contributions from others, Mechanical Design of Electric Motors highlights the innovative and advanced electric motors developed over the past decades.
Mechanical Design of Electric Motors
The importance of electric motors is well known in different engineering fields. The book provides comprehensive coverage of different types of electric motors, including DC motors, three-phase and single-phase induction motors, synchronous motors, universal motor, AC servo motor, linear induction motor, and stepper motors. The book covers all the details of DC motors, including the torque equation, e.m.f. feedback, characteristics, starter types, speed control methods and applications.
The book also covers the different methods of testing DC motors such as Swinburne test, brake test, idle test, field test and Hopkinson test. The book explains three-phase induction motors in detail. It includes production of rotating magnetic field, construction, operation, effect of slip, torque equation, torque ratios, torque-slip characteristics, losses, power flow, equivalent circuit, effect of harmonics on performance, pie chart and applications. This chapter also includes the discussion of induction generator. The book teaches the various methods of starting and controlling the speed of three-phase induction motors. The book incorporates the explanation of different single phase induction motors. Synchronous motor chapter provides detailed discussion of construction, principle of operation, on-load behavior, phasor diagram analysis, V-shaped and inverted-V curves, sloshing, synchronous capacitor and applications. The book also teaches the different special machines such as single phase commutator motors, universal motor, AC servo motor, linear induction motor and stepper motors. The book uses clear and lucid language to explain each topic. The book provides the logical method to explain the different complicated topics and the step-by-step methods to make it easier to understand. Each chapter is well supported by necessary illustrations, self-explanatory diagrams, and a variety of solved problems. The book explains the philosophy of the subject, which makes understanding the concepts very clear and makes the subject more interesting.
Motor Starting and Control Primer: An introduction to the starting techniques and control of electric motors
Whether you are a busy electrical engineer needing to brush up on starting motors, a time-pressed student new to the field, or an interested individual with an hour to spare, this book is the perfect place to start. Steven McFadyen shares his expertise in starting engines in a clear, easily accessible manner without time-consuming verbiage or self-promoting discussions. Complete with circuit diagrams and in-depth explanations of the most common motor starting methods – and challenges – this book is an invaluable reference. It has something to offer anyone who wants to learn new things, while helping practicing electrical engineers design and implement reliable and functional motor starters.
