Valves – Troubleshooting and repair
A control valve is a valve used to control the flow of fluid by varying the size of the flow passage as directed by a signal from a controller
This allows direct control of flow rate and consequent control of process quantities such as pressure, temperature and liquid level.
In automatic control terminology, a control valve is called a “final control element”.
More about valves
Consult valves and spare parts at Unitec:
https://www.unitecd.com/e-catalog/description-articles/?lingua=GB&category=Valve&prm=ric_ft
Buy books
Motors and Electrical Units: Fundamentals, Types and Applications
Best-selling reference on Electric Motors and Drives for non-experts, bridging the gap between mathematics and theory.
Mechanical Design of Electric Motors
Rapid increases in energy consumption and emphasis on environmental protection have created 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, manufacturers, as well as maintenance personnel, undergraduate and graduate students, and academic researchers, Mechanical Design of Electric Motors provides in-depth knowledge of state-of-the-art design methods and developments of electric motors. From motor classification, motor component design, model configuration, and material and bearing selections to power losses, motor cooling, design integration, vibration, and acoustic noise, this comprehensive text covers the fundamentals, practical design, and issues related to design, modeling and simulation, engineering analysis, manufacturing processes, test procedures, and performance characteristics of today's electric motors.
Focusing on the mechanical design of modern electric motors, the book:
Details the design and manufacturing of key components and subsystems such as rotors, shafts, stators and frames
Examines various refrigeration techniques, including forced air, liquid, and phase change
Discusses analysis and calculation of engine power losses
Addresses engine vibration and acoustic noise issues
Presents engineering analysis methods and case study results
Emphasizes construction, optimization and applications
Featuring research findings from the author's own personal experience and the significant contributions of others, Mechanical Design of Electric Motors highlights innovative and advanced electric motors developed over the past few decades.
Mechanical Design of Electric Motors
The importance of electric motors is well known in various fields of engineering. The book provides comprehensive coverage of the various 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 torque equation, counter electromotive force, characteristics, starting types, speed control methods and applications.
The book also covers the various DC motor testing methods such as Swinburne test, brake test, delay test, field test and Hopkinson test. The book also explains three-phase induction motors in detail. Includes rotating magnetic field production, construction, operation, slip effect, torque equation, torque ratios, torque-slip characteristics, losses, power flow, equivalent circuit, effect of harmonics on performance, circle diagram and applications. This chapter also includes discussion of the induction generator. The book teaches the various starting methods and speed control methods of three-phase induction motors. The book incorporates the explanation of various single-phase induction motors. The chapter on synchronous motors provides detailed discussion of construction, working principle, behavior under load, phasor diagram analysis, Vee and inverted Vee curves, hunting, synchronous capacitor and applications. The book also teaches various special machines such as single-phase switching motors, universal motor, AC servo motor, linear induction motor and stepper motors. The book uses clear, lucid language to explain each topic. The book provides the logical method of explaining the various complicated topics and step by step methods for easy understanding. Each chapter is well supported with necessary illustrations, self-explanatory diagrams and 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 electric motor starting and control techniques
Whether you're a busy electrical engineer who needs a refresher on motor starting, a busy student new to the subject, or a curious person with an hour to spare, this book is the place to start. Steven McFadyen shares his expert knowledge about engine starting in a clear, easily accessible way, without unnecessary verbiage or pretentious discussions. Complete with circuit diagrams and thorough explanations of the most common motor starting methods – and challenges – this book is an invaluable reference. It offers something for anyone interested in learning new things, while at the same time helping practicing electrical engineers design and implement reliable and functional motor starters.
