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Chemical & Process Technology

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Tuesday, November 27, 2007

CV

Control valve has been widely used in Chemical & Process Plant for material feeding control and operating condition control, material feeding control. Today control valve technology is highly reliability and availability and long life span. It is a very mature technology. There are many handbooks and articles available online and FREE for read and download. Out of all, i would like to highlight a few that i think they are rather complete and you shall not miss them.

FISHER CONTROL VALVE HANDBOOK
Emerson Fisher
The Control Valve Handbook is both a textbook and a reference on the strongest link in the control loop, the control valve and its accessories. This book includes extensive and proven knowledge from leading experts in the process control field including contributions from the ISA and the Crane Company...

MASONEILAN CONTROL VALVE HANDBOOK
Masoneilan
This handbook on control valve sizing is based on the use of nomenclature and sizing equations from ISA Standard S75.01 and IEC Standard 534-2. Additional explanations and supportive information are provided beyond the content of the standards...

GUIDELINES FOR APPLICATION OF CONTROL VALVES
Process Industrial Practices
In an effort to minimize the cost of process industry facilities, this Practice has been prepared from the technical requirements in the existing standards of major industrial users, contractors, or standards organizations. By harmonizing these technical requirements into a single set of Practices, administrative, application, and engineering costs to both the purchaser and the manufacturer should be reduced. While this Practice is expected to incorporate the majority of requirements of most users, individual applications may involve requirements that will be appended to and take precedence over this Practice...

VALVE SIZING & SELECTION
CheResources
Step-by-step control valve sizing method and comparison of different types of control valve as well as selection...

CONTROL VALVE TUTORIAL
Spirax Sarco
This tutorial briefly describes the basic components of different types of linear and rotary action control valves available for use in steam and water systems...

SIZING AND SELECTION OF CONTROL VALVES
Siemens
The control valve is the most important single element in any fluid handling system, because it regulates the flow of fluid to the process. To properly select a control valve, a general knowledge of the process and components is usually necessary. This reference section can help you select and size the control valve that most closely matches the process requirements. The sizing of a valve is very important if it is to render good service. If it is undersized, it will not have sufficient capacity. If it is oversized, the controlled variable may cycle, and the seat, and disc will be subject to wire drawing because of the restricted opening.

EASE CONTROL VALVE SELECTION
With so many types and options available, choosing the right control valve can seem daunting. Selection can be simplified by considering the process fluid, the service requirements, and how the various valves function.

PLANT DESIGN & CONTROL VALVE SELECTION UNDER INCREASING COST & TIME PRESSURE
Dipl. Ing. Holger Siemers, SAMSON AG
  • (Part I) - This article is split into two parts: broadly speaking, part one looks at control valve operating points and provides a case history involving a mismatch. The author introduces better valve sizing practices and uses this theory to resolve the problems introduced in the case history. Part two (scheduled for the June issue) starts by explaining the trends and definitions of inherent valve characteristics before focusing on, "quick and dirty" sizing. The paper then addresses cavitation before concluding with the expert software CONVAL to help select the optimum valve characteristic form.
  • (Part II) - Part two starts by explaining the trends and definitions of inherent valve characteristics before focusing on "quick and dirty" sizing. The paper then addresses cavitation before concluding with the expert software available to help select the optimum valve characteristic form.

CONTROL VALVE DESIGN ASPECTS FOR CRITICAL APPLICATIONS IN PETROCHEMICAL PLANTS
Dipl. Ing. Holger Siemers, SAMSON AG


  • (Part I) - This paper reviews the past, present and future of valve design and sizing, taking all-important issues such as increasing cost pressure and time pressure into account. This paper is presented in two parts: firstly, how to use manufacturer independent software to analyze given or calculated plant parameters in more detail from an overall point of view with a complete power check and optimizing possibilities. Some case studies are also discussed. The second section, scheduled for a future issue, includes information on to design, size and use severe service control valves with good performance for long maintenance intervals. Different philosophies of valve design (plug design), pressure balance systems, stem sealing, actuator sizing, cost philosophies for "high end" applications are discussed.
  • (Part II) - This section presents information on design, size and use of severe service control valves, the kind of troubles that can be predicted with control valve sizing as well as suggestions for troubleshooting control valve failures.

VALVE SIZING & SELECTION TECHNICAL REFERENCE
WARREN CONTROLS
A Control Valve performs a special task, controlling the flow of fluids so a process variable such as fluid pressure, fluid level or temperature can be controlled. In addition to controlling the flow, a control valve may be used to shut off flow. A control valve may be defined as a valve with a powered actuator that responds to an external signal. The signal usually comes from a controller. The controller and valve together form a basic control loop. The control valve is seldom full open or closed but in an intermediate position controlling the flow of fluid through the valve. In this dynamic service condition, the valve must withstand the erosive effects of the flowing fluid while maintaining an accurate position to maintain the process variable.

WELKER JET CONTROL VALVE - A PRACTICAL APPLICATION HANDBOOK
Welker Eng
The current Welker Jet® and the earlier Jet Stream™ Control Valves are the most unique Control Valves on the market today. Over the last 44 years, Welker employees have discussed the Jet with thousands of people and users in over 15 countries worldwide. Because of its unique features and unparalleled performance, much has been said and misunderstood about this product. In an attempt to clarify some of these statements and to share the accumulated "pearls of wisdom" that have been recorded over the years, this handbook has been assembled. A full understanding of the Jet, will give the engineer, designer, operations personnel and technician a greater appreciation for the features that the Jet presents and the performance that can be expected. The Jet can solve many problems that otherwise would create additional engineering and cost for the gas company.

FAQ Related to Control Valves
Besides theory and practical knowledge in articles, there are still many frequently asked questions related to control valve. Following is a list of frequently asked question (FAQ) related to control valve. It is pretty useful especially to young engineer.


MY WISH...
I have received number of emails from sincere reader of this blog. Large percentage are came from young and dynamic engineers. They are willing to learn and contribute within our community. Above is only part of many that i think are useful for a young engineers. I hope you may learn from them. Also if you know any that is useful...please let me know. I will pack here for the benefits of all...

(updated on Feb 07, 2008)

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posted by Webworm, 7:59 PM

6 Comments:

Anonymous hydraulic control valves said...

Thanks for sharing this interesting article.

October 28, 2008 at 3:46 AM  
Anonymous gate valves said...

this is great. appreciate the post.

May 29, 2009 at 3:17 AM  
Blogger Narayanan said...

Many thanks for sharing above articles.

June 26, 2010 at 7:15 AM  
Anonymous JoeWong said...

Hope all can contribute their little bit to make this website more interesting...

June 27, 2010 at 7:11 AM  
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October 26, 2010 at 12:00 PM  
Anonymous chemind said...

Control valve characteristic determination will given an idea in design and selection of the control valve for particular application.

December 17, 2011 at 5:47 PM  

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