CONTROL VALVE FLOW CHARACTERISTICS
LIQUID LEVEL SYSTEM CONTROL VALVE PRESSURE DROP BEST INHERENT CHARACTERISTIC
Technical Principles of Valves
Sunday, July 8th, 2007
GENERAL
Solenoid valves are used wherever fluid flow has to be controlled automatically. They are being used to an increasing degree in the most varied types of plants and equipment. The variety of different designs which are available enables a valve to be selected to specifically suit the application in question.
CONSTRUCTION
Solenoid valves are control units which, […]
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Control valve terminology
Monday, May 14th, 2007
AUTOMATIC CONTROL VALVE
An automatic control valve consists of a valve body and an actuator. The actuator is controlled by a pneumatic or electric signal from a remote point changing the rate of medium flow passing through the valve.
VALVE COMPONENTS
Actuator – That part of an automatic control valve which causes the valve stem to move.
Body […]
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CONTROL VALVE FLOW CHARACTERISTICS
Monday, May 14th, 2007
LIQUID LEVEL SYSTEM
CONTROL VALVE PRESSURE DROP
BEST INHERENT CHARACTERISTIC
Constant D P
Linear
Decreasing D P with Increasing Load, D P […]
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The Ever-Popular Gate Valve
Monday, May 14th, 2007
This low-tech valve may not have changed much in the last 100 years, but the gate valve plays a major role in virtually every refinery, chemical plant and industrial facility in the world.
The most popular style of valve in the world of flow control is the gate valve. They are the on/off switches of the […]
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Control Valves and Flow Characteristics
Friday, May 4th, 2007
Surfacing for Wear Resistance
For the successful hard surfacing or overlaying operation a welding procedure should be established. The procedure should be related to the particular part being surfaced and the composition or analysis of the part. It should specify the welding process to be used, the method of application, the prewelding operations such as cleaning, […]
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Control Valves: Choke Valve Trim
Friday, May 4th, 2007
Valve Bonnet The cover for the opening in the valve body is the bonnet. In some designs, the body itself is split into two sections that bolt together. Like valve bodies, bonnets vary in design. Some bonnets function simply as valve covers, while others support valve internals and accessories such as the stem, disk, and […]
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HART® PROFIBUS® and Foundation™ Fieldbus.
Monday, April 30th, 2007
What is HART®?
HART® stands for ‘Highway Addressable Remote Transducer’ and is a standard originally developed as a communications protocol for control field devices operating on a 4-20 mA control signal.
The HART® protocol uses 1200 baud Frequency Shift Keying (FSK) based on the Bell 202 standard to superimpose digital information on the conventional 4-20 mA analogue […]
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PROFIBus PROTOCOL
Saturday, April 14th, 2007
Technology Overview
Communication in automation is becoming increasingly direct, horizontally at field level as well as vertically through all hierarchy levels. Depending on the application and price, graduated and matched industrial communication systems offer the ideal preconditions for transparent networking in all areas and levels of the automation process. Profibus offers such a graduated system with […]
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Oxygen Sensor Types – Intro4u2u.com
Saturday, March 17th, 2007
Oxygen Sensor Types
Today’s oxygen analyzers use one of a several types of oxygen sensors. As industrial process applications call for improved measurement accuracy and repeatability, users are also demanding analyzers that require a minimum of maintenance and calibration. To this end, users of oxygen analyzers are encouraged to evaluate the merits of a particular oxygen […]
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Technical Principles of Valves
Friday, January 12th, 2007
Risk, Reliability and Safety
Hazardous areas classifications, types of protection, rating systems and critical temperatures.
Sizing Steam and Condensate Pipes
GENERAL
Solenoid valves are used wherever fluid flow has to be controlled automatically. They are being used to an increasing degree in the most varied types of plants and equipment. The variety of different designs which are available enables […]
