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Publikation

Control valve design aspects for critical applications in petrochemical plants – part III
30 September 2004

This final section of Mr Holger Siemers article on control valve design and sizing continues on from part I+II, which can be found in the June and August 2004 issue of Valve World.

 

Control valve design aspects for critical applications in petrochemical plants – part II
31 July 2004

This second section of Mr Holger Siemers article on control valve design and sizing continues on from part I, which can be found in the June 2004 issue of Valve World. 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. The final section, part III, will be ready and waiting in the upcoming October issue.

 

Control valve design aspects for critical applications in petrochemical plants – part I
31 May 2004

With three decades of experience in demanding applications, Mr Siemers has a deep appreciation of developments and trends in sizing control valves. In this paper, he 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.

Berechnung vom Dampfumformventilen mit CONVAL®
31 January 2002


Seit langem schon gibt es herstellerspezifische wie auch unabhängige Softwarelösungen, um verschiedenste Arten von Stellventilen auszulegen und zu optimieren.


CONVAL® hat bisher das Spektrum vom Hubventil über Klappen und Kugelhähne bis hin zum Membranventil mit allen nötigen Zusatzberechnungen abgedeckt.


Design of Control valves for gases with high differential pressures
28 February 2001

The fact that fluid properties are unknown and typical values for ideal gases are assumed by way of approximation frequently results in the over dimensioning of actuation systems for high differential pressure systems.

The isentropic exponent (kappa) and the valve factor xT can, in particular, have an enormous influence on the coefficient of flow Kv needed. The use of CONVAL® 5.0 software for design with integrated thermodynamic physical data computation and a valve database virtually eliminates such errors.

Process and energy management for control valves and pipe internals with CONVAL(r) 5.0 for Windows
08 September 1999

This article describes CONVAL® 5 for Windows, which was recently launched in the marketplace following a development phase lasting several years. It begins by demonstrating typical problems relating to time-critical plant design, focusing particularly on the plant and control valve parameter "dynamic pressure ratio" (dp100/dp0) and continuous valve characteristics between linear and equal-percentage.

Component calculations from A to Z
09 October 2000

Plant structures often contain a large number of components that have to be designed and calculated precisely. CONVAL® is a software package which is intended to simplify the work of plant operators and planners. Its potential range of applications is examined here with reference to a practical example.

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