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| HTML1DocumentEncodingutf-8>çåó7_ãéèðáòç=ùùITPù "òåôîõïã"=êPYT ùùSI< |
| Control Books - Technical Publications |
| Lehavot Habashan, ,12125 |
| Israel |
| Tel.972-6-6952108 |
| Fax.972-6-6952110 |
| idr@lehavot.org.il |
| Flow Control Devices |
By Yochanan Dvir  |
ISBN: 965-222-951-2  |
| 2nd ed. 1997 * Softcover, 360 pages * about 250 drawings and tables. |
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A textbook dealing with devices serving for control of flow in liquid supply and distribution systems, municipal, industrial and agricultural. It describes most of the appliances used in such systems, the various mechanical and hydraulic properties of such devices, and gives useful information on the installation and maintenance required to ensure their proper functioning. |
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The topics dealt with in the book include stop, check, regulation and safety valves, air valves, meters, gauges, filters and joints and also problems in applied hydraulic - water hammer and cavitation. |
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The book is based on both the theoretical considerations of hydraulic and mechanical performance of the various devices, and on the personal experience of the author of over 30 years of fluid distribution systems design, operation and maintenance. |
| To see the full contents list click here |
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Few books in the technical literature deal with appliances in piping systems for fluid supply. This book contributes largely to this, so important subject. A very wide range of |
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appliances, their hydraulic and mechanical properties can be found here, together with some unique and important topics in applied hydraulics, and among them: |
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.1 |
the hydraulic interdependence of the throttling device and the piping system, its influence on the mechanical actuation of the device and on the possible occurrence of water hammer in the system. |
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.2 |
check valve behavior at various flow velocities, and the consequent sizing of the valve. |
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.3 |
air flow conditions in an air valve, as basis for sizing the air valve orifice for draining and filling the piping system. |
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These together with an extensive, clear description of most of the devices used for flow control, their performance, installation and maintenance requirements make this book a must for every water, oil or industrial piping system designer, manager and operator. |
| FROM THE INTRODUCTION: |
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Any device installed in a fluid supply system, in order to ensure that the fluid reaches the desired destination, at the proper time, in the required amount (the flow rate), and under the right pressure, is called a control appliance. |
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As such an appliance controls proper operation of a fluid system, selecting its type, size and placement is of uppermost importance and ought to be done with the full knowledge of the various features of the device and with complete understanding of the way it performs. Equally important is proper maintenance in order to ensure faultless and sound performance of the appliance. |
| REVIEW: |
| Prof. Ilan Amir wrote: |
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While reading the book I came to appreciate the wide scope of the book, the precision and the clearness of the presentation. Based on my experience, a handbook that contains both theoretical and practical aspects of flow devices is very important for the improvement of the planning and operating fluid networks. It also will be of a significant help for students specializing in water and environmental engineering. I hope that the book will be used widely. |
| Prof. Ilan Amir |
| Faculty of Agricultural Engineering, |
| Technion - Israel Institute of Technology, Haifa, Israel. |
| ABOUT THE AUTHOR: |
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The author is a mechanical engineer, now retired, with over 35 years of field practice in design, installation and maintenance of systems for water distribution, irrigation, and fire fighting. |
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He also served as instructor in extension services for water systems, as a member and chairman of several committees of the Israeli Standard Institute, and as a lecturer in institutions for technical adult education. |
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Mr.Dvir has published several articles on applied hydraulics, and eight books (in Hebrew) on various topics in water and fire fighting installations. He is also the author of several technical dictionaries and lexicons. |
| CONTENTS: |
| .1 HYDRAULICS OF FLOW CONTROL |
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1.1 Properties of water: |
| Viscosity , Density and specific weight, Bulk modulus, Pressure, Vapor pressure. |
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1.2 Properties of air and gases: |
| Compression and expansion , Measurement of air and gases , Free and dissolved air. |
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1.3 Loss of energy in control devices: |
| Throttling properties of devices , Loss of head in water system, Reynolds flow number |
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1.4 Hydraulics of valve - pipeline system. |
| .2 MATERIALS AND FINISH |
| Ferrous materials, Non-ferrous materials, Resilient materials, Finishing, packaging and marking . |
| .3 VALVES |
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3.1 Stop valves: |
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Gate valves, Disk valves, Ball and plug valves, Butterfly valves, Radial valves, Knife-edged valve, Diaphragm valve, Ring valve. |
| Construction, Manual & remote operators, Automatic operation. |
| Hydraulic performance, Mechanical performance, Loss of energy curves. |
| Stuffing box, Maintenance of stuffing box, The seal-less seal. |
| Automatic and remote control, Operating forces. |
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3.2 Check valves: |
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Swing check valve, Foot valve, Drain valve, Parallel check valve, Butterfly check valve, Tilting disk valve, Radial valve, Hydraulic check valve. |
| Installation, Backflow prevention, Energy losses, Speed of closure, Damping of slam. |
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3.3 Regulating valves: |
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Direct pressure regulators, Pilot controlled regulators, Pilot valves, Floating & positioning control pilots, Multiple purpose pilots. |
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Choosing regulating valve, Characteristics of pressure regulation, Interaction of regulator and system.Static pressure regulation, Bi-directional feed, Pump output regulation , Rate of flow regulation, Water level regulation. |
| .4 METERS |
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4.1 Volumetric measurement |
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4.2 Mechanical measurement of velocity |
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4.3 Performance of water meters |
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4.4 Differential water meters Venturi tube, Metering nozzle & orifice, Energy loss, |
| Display devices. Accuracy of differential meters, Choosing differential meter |
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4.5 Other types of meters Variable area flow meter (Rotameter), Electromagnetic flow meter |
| Centrifugal meter, check-valve meter, Swirl meter, Ultrasonic meter, Vortex meter. |
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4.6 Registering flow rates. |
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4.7 Measurement of free jet flow. |
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.5 |
PRESSURE GAUGES |
| .Bourdon gauge, Diaphragm and bellows gauges. |
| Testing and maintenance, Pressure recording, Gauges for telemetry. |
| .6 AIR VALVES |
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Description and usages, Direct sealing air valve, Lever-operating air valve, Vacuum valve, Venting valve. |
| Principle of performance, Theory of airflow. |
| Installation and maintenance. |
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.7 |
SAFETY VALVES |
| Purpose and functions, Construction, Principle of operation, Installation and maintenance. |
| .8 FILTERS |
| Solids in water, Filtration equipment, Filtration level. |
| Filtration methods, Area & volume filtration, Kinetic filtration. |
| Cleaning and maintenance, Loss of energy in filters. |
| .9 COMPUTERIZED CONTROL |
| Data control systems, Operation of control systems, Power supply & communication. |
| .10 JOINTS AND COUPLINGS |
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Flanged connections, Gaskets, Bolts, Strength of connections, Couplings & harnesses, Screwed connections. Copper & plastic tube joints. |
| .11 INSTALLATION OF CONTROL DEVICES |
| Underground & aboveground installation, Installation in aboveground piping. |
| .12 HYDRAULIC DISTURBANCES |
| 12.1 Water hammer |
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Theory, Maximum pressure rise, Intensity of water hammer, Influence of air on water hammer. 12.2 Cavitation |
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The cavitation phenomenon, Factors of cavitation, Calculation of cavitation potential, Prevention of cavitation. |
| INDEX |
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Last updated: March 23, 2001