Tuesday, May 13, 2008

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Topic: Control Valve Technology Library

Flowmeter Technology LibraryThis nifty resource helps you find anything and everything you need to know about control valves without having to endlessly surf the web. It provides descriptions and general information for all valve technologies used in process control and automation applications, and allows you to view online intelligence reports, white papers, articles, and technical book abstracts on all things related to control valves.

Control Valve Technology

A control valve regulates the flow or pressure of a fluid. Control valves normally respond to signals generated by independent devices such as flow meters or temperature gauges. Control valves are normally fitted with actuators and positioners. Pneumatically-actuated globe valves are widely used for control purposes in many industries, although quarter-turn types such as (modified) ball and butterfly valves are also used.

Control valves can also work with hydraulic actuators (also known as hydraulic pilots). These types of valves are also known as Automatic Control Valves. The hydraulic actuators will respond to changes of pressure or flow and will open/close the valve. Automatic Control Valves do not require an external power source, meaning that the fluid pressure is enough to open and close the valve. Automatic control valves include: pressure reducing valves, flow control valves, back-pressure sustaining valves, altitude valves, and relief valves. An altitude valve controls the level of a tank. The altitude valve will remain open while the tank is not full and it will close when the tanks reaches its maximum level. The opening and closing of the valve requires no external power source (electric, pneumatic, or man power), it is done automatically, hence its name.

Control Valves

Control Valve Technology LibraryA control valve regulates the flow or pressure of a fluid. Control valves normally respond to signals generated by independent devices such as flow meters or temperature gauges. Control valves are normally fitted with actuators and positioners. Pneumatically-actuated globe valves are widely used for control purposes in many industries, although quarter-turn types such as (modified) ball and butterfly valves are also used.

Control valves can also work with hydraulic actuators (also known as hydraulic pilots). These types of valves are also known as Automatic Control Valves. The hydraulic actuators will respond to changes of pressure or flow and will open/close the valve. Automatic Control Valves do not require an external power source, meaning that the fluid pressure is enough to open and close the valve. Automatic control valves include: pressure reducing valves, flow control valves, back-pressure sustaining valves, altitude valves, and relief valves. An altitude valve controls the level of a tank. The altitude valve will remain open while the tank is not full and it will close when the tanks reaches its maximum level. The opening and closing of the valve requires no external power source (electric, pneumatic, or man power), it is done automatically, hence its name.

Control Valve Handbook, Fourth Edition
The latest update to this classic reference tool, also known as Fisher's Little Black Book, is now available online. This newest version, a staple in the industry for more than 30 years, presents information on control valve performance and new technologies, and includes input from experts in the field. View, save or download your complimentary copy of this invaluable reference tool here.
Control Valve Handbook, Fourth Edition


Submit Articles on Control Valves
We welcome contributions from engineers and technically minded people. Your articles can be anything to do with a control valve or anything to do with the subject of valves that you think will help educate others. Article submission can be in Word, pdf, or html format. If your article is useful to other people, we will add it to our site. Send your articles to wboyes@putman.net.

Cavitation in Control Valves
ControlGlobal.com
How Should I Minimize or Maximize Cavitation in Control Valves?

Split-Ranging Multiple Valves
ControlGlobal.com
Readers Write In and Question Split-Range Concept

More on Digital Valve Technology
ControlGlobal.com
Online Resources on Digital Valve Technology

Greg’s Articles on Valve Dynamics
ControlGlobal.com
See McMillan's Resources on Valves

More Articles »

Product Roundup:
Control Valves, Actuators & Positioners

  • How to select control valves, Part 1
  • How to select control valves, Part 2
  • How to select control valves, Part 3
  • White Papers: In depth research


    Title Author Date
    Selecting Advanced Automation Solutions for On-Off Valves: Reduce Costs, Improve Reliability and Functionality Metso Automation 01/31/2008
    Looking for trouble-free valve solutions to improve uptime and cut operating costs? 
    Control Valve Handbook, 4th Edition Emerson Process Management 10/27/2006
    The Control Valve Handbook has been a primary reference since its first printing in 1965. This fourth edition presents vital information on control valve performance and the latest technologies. 
    Cost effective leak detection and repair Honeywell Process Solutions 09/06/2006
    As the population of valves and safety relief valves continues to grow so do leak detection and repair costs. New wireless technologies offer the potential to reduce these costs significantly while providing access to many new monitor points previously not accessible. 
    Building the digital foundation for enterprise O&M solutions Metso Automation 03/14/2006
    With the advent of FDT/DTM technology, process manufacturers’ options for monitoring and managing field devices over digital and wireless networks are wide open.  
    Implementing MPC to reduce variability by optimizing control valve response Emerson Process Management 12/12/2005
    In this paper, a model predictive controller is configured to simultaneously manipulate a small valve and a large valve, eliminating the problems inherent in split-ranged and valve-position controllers.  
    Control Valve Handbook 03/17/2005
     
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