Valves – Troubleshooting and Repair
A control valve is a valve for controlling fluid flow by changing the flow area according to a signal from a controller
This enables immediate control of the flow rate and the resulting control of process variables such as Pressure, temperature and liquid level.
In automatic control technology, a control valve is called an “actuator”.
More information about valves
Request valves and spare parts from Unitec:
https://www.unitecd.com/e-catalog/description-articles/?lingua=GB&category=Valve&prm=ric_ft
Buy books
Electric Motors and Drives: Fundamentals, Types and Applications
Proven reference work on electric motors and drives for non-specialists, bridging the gap between mathematics and theory.
Mechanical Design of Electric Motors
Rapidly growing energy consumption and emphasis on environmental protection have posed challenges to the motor industry, as has the design and manufacture of highly efficient, reliable, cost-effective, energy-saving, quiet, precisely controlled and long-lasting electric motors.
Suitable for engine designers, engineers and manufacturers as well as maintenance personnel, undergraduate and graduate students, and academic researchers, Electric Motor Mechanical Design provides in-depth knowledge of modern electric motor design methods and developments. From engine classification, engine component design, model construction, and material and bearing selection to power losses, engine cooling, design integration, vibration, and acoustic noise, this comprehensive work covers the fundamentals, practical design and design-related issues, modeling and simulation, engineering analysis, manufacturing processes, testing procedures, and performance characteristics of today's electric motors.
With a focus on the mechanical design of modern electric motors, the book covers:
Details on the design and manufacture of large components and subsystems such as rotors, shafts, stators and frames
Review of various cooling methods including air cooling under pressure, liquid cooling and phase change
Discussion of analysis and calculation of engine power losses
Dealing with engine vibrations and acoustic noise issues
Presentation of engineering analysis methods and case studies
Emphasis on design, optimization and applications
With research from the author's own experience and valuable contributions from 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 known in various engineering fields. The book provides comprehensive coverage of various types of electric motors including DC motors, three-phase asynchronous and single-phase asynchronous motors, synchronous motors, general purpose motor, AC servo motors, linear induction motor and stepper motors. The book covers all details of DC motors including torque equation, back electromotive force, characteristics, types of starters, speed control methods and applications.
The book also covers various testing methods of DC motors such as Swinburne test, brake test, deceleration test, field test and Hopkinson test. The book further explains three-phase asynchronous motors in detail. It covers generation of rotating magnetic field, construction, operation, effects of slip, torque equation, torque quotient, torque-slip characteristics, losses, power flow, equivalent circuit, effects of harmonics on performance, pie chart and applications. This chapter also covers the discussion of inductor generators. The book teaches various starting methods and speed control methods of three-phase asynchronous motors. The book contains the explanation of various single phase asynchronous motors. The chapter on synchronous motors provides a detailed discussion of construction, operating principle, behavior under load, analysis of phasor diagrams, V and inverted V curves, pulling, synchronous capacitor and applications. The book also teaches various special machines such as single phase commutator motors, general purpose motor, AC servo motors, linear induction motor and stepper motors. The book uses clear, understandable language to explain each topic. The book provides the logical method to explain various complicated topics and step-by-step procedures to facilitate understanding. Each chapter is well supported by necessary illustrations, self-explanatory diagrams and a variety of solved tasks. The book explains the philosophy of the subject, which makes the understanding of 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 refresh your knowledge of engine starting, a time-strapped student new to the subject, or an interested layperson with an hour to spare, this book is the right place to start. Steven McFadyen shares his engine starting expertise in a clear and accessible way without time-consuming ramblings or self-aggrandizing discussions. With wiring diagrams and thorough explanations of the most common engine starting methods - and challenges - this book is an irreplaceable reference. It has something to offer for anyone who enjoys learning new things while helping practicing electrical engineers design and implement reliable and functional motor starters.
