About me

I have been a Control Valve Technology Specialist for 45 years and over that time I have gained a lot of insight into the proper application of control valves. I recently retired but can't bring myself to completely divorce myself from the world of control valves.

Jon Monsen, PhD, PE OR (Ret.), CA, WA


I will attempt to answer any questions about things on this web site.

It is always nice to hear from someone who has found something useful here.

I seem to be getting older and have less energy than in the past. I am unable to get involved in any sort of consulting services. I can be reached at  CvAppTools@

(In an attempt to discourage robots, I have left off the domain name.

It is the domain associated with Google)

My health has taken a sudden turn for the worse. Don't be disappointed if I don't reply.


The Author has made a reasonable effort to ensure the accuracy of the information herein. However, the information contained on this site is provided without any representation or warranty as to accuracy or completeness or otherwise and should be used only as a general guideline and not as an authoritative source of technical information. The Author is not offering the information as engineering or other professional services or advice. This site does not constitute an offer or solicitation to perform professional engineering services.

Privacy Policy

I have no way of identifying who views this web site, uses the links or downloads files from it. If you send me an email to the address listed above, I will attempt to answer any questions you ask to the best of my ability. The only email I will ever send you is an answer to your question, or if you request it, I will advise you of any changes I make to any of the Excel sheets you have specifically asked for. I normally save questions sent to me and the answers I provide. I do not share any of these emails or email addresses with anyone. I sometimes reference questions I am asked in future articles or papers, but never identify the source of the question. All the files offered for download have been checked by the latest version of Norton Anti-Virus software. There are some links to the web sites of others over which I have no control and would refer you to their privacy policy.







About this site

I have gathered various information onto this site in the hope that it will be useful to someone. There are separate pages for:

  1.  Excel® worksheets that perform calculations that might be of use to those who deal with or apply control valves. Included are valve sizing worksheets
  2. Articles I have written
  3.  Links to some things that one may find useful
  4. Books I have written or recommend.
  5. Professional Development. The handout booklet for a two- day control valve application training seminar. (320 pages) 

Subjects that are addressed include:

  • Control valve sizing
  • Control valve noise
  • Cavitation in control valves
  • Liquid vapor pressure
  • Gas compressibility factor
  • Determining the pressure drop to use in a valve sizing calculation
  • Control valve installed gain
  • Control valve flow characteristics