Diagnostic tools for control valves

Dr. Jörg Kiesbauer
SAMSON AG,Frankfurt/Main
Digital positioners offer interesting features regarding improved process plant reliability and maintenance or servicing. This could provide the basis for using software tools for early fault diagnosis and performance visualization of control valves with extended functions. These tools can completely preserve the control valve 's condition when new. It can be subjected to trend analyses as well as to preventative maintenance and servicing while in operation.This article describes these possibilities based on an example of such a new diagnostic tool.
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Intrinsic safety and flameproof enclosure -
an impossible team in explosion
protection?

Dipl.-Ing Guido König and Prof. Dr.-Ing. Heinfried Hoffmann
SAMSON AG, Frankfurt/Main
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(zipped .PDF, 470Kb - get Acrobat Reader)

Noise Calculation and Prediction

Valve Noise Prediction verses Velocity Head Limitations in Gas Applications-Joseph Shahda - Principal Engineer Masoneilan -from our valued sponsors Austral Powerflo Solutions and Masoneilan
In recent years, the control valve industry has seen an important debate about the validity of limiting the valve trim exit velocity head to a maximum of 480 kPa in gas and steam applications. This velocity limitation is assumed to provide an acceptable noise level and avoid problems that arise in control valve gas and steam applications. However, in a very large number of applications, adopting a velocity limiting approach may require the use of expensive multi-stage or multi-turn trim designs.

This article demonstrates that low noise levels can be achieved without following this overly conservative and expensive trim exit velocity head limitation. It also highlights that having a trim exit velocity head lower than 480 kPa will still generate a very high valve noise level if the valve outlet Mach number is high.

Masoneilan Noise Control Manual-from our valued sponsors Austral Powerflo Solutions and Masoneilan

This 24 page manual provides comprehensive informative material regarding noise in general and control valve noise in particular. 

It covers Control Valve Noise, Aerodynamic Noise Prediction, Aerodynamic Control Valve Noise Reduction, Atmospheric Vent Systems, Hydrodynamic Noise and Installation Considerations.

Selection and Application

Avoid control valve application problems with physics-based models -Kinetic energy criteria have many limitations- from our valued sponsors Austral Powerflo Solutions and Masoneilan -This article explores the rationale for KE limitations and demonstrates that KE criteria often provide very rough approximations of the actual physical phenomena that cause valve problems

Implementing MPC to Reduce Variability by Optimizing Control Valve Response- Ever had a problem with split range valves, this paper may just help! Thanks to www.controlglobal.com and our sponsor Emerson Process Management 

  Composite Valves 

Looking for a valve without corrosion problems? These valves made from plastics and potentially using Nanotechnology techniques may just solve them.

  Specialist Power Plant Valves

These valves are specific to those power plant issues such as de-superheaters, steam service etc.

Selection and Application of Positioners, Limit Switches, Solenoid Valves and Other Accessories- Information from our valued sponsor Samson Controls

Doing Business Differently-Digital Positioners-from our valued sponsors Austal Powerflo Solutions and Masoneilan

The next generation of smarter valves part 1 and part 2 - By Béla Lipták, thanks to ControlGlobal.com

Smart technologies sustain plant reliability, help control costs - Todd Gordon - This article highlights the benefits of DVC technologies in a power plant - from Emerson Process Management.

  Valve Actuators

This is ICEweb's Technical Information on Control and Quarter Turn Valve Actuators