Equivalent length deviation standard for valves

[rdclzn]

Greetings,

I am trying to conduct an assessment of the equivalent length (or resistance constant) of valve types as part of an assignment. However, I can only find reference values (both in manufacturer sheets and textbooks) without a single mention of expected deviations.

Are there any standards that I could use to do comparative analysis of my results?

Thank you

 

[MFJewell]

Crane TP-410. Start with chapter 2 and appendix A-27/28/29.

 

[LittleInch]

Don't think so.

Most equivalent lengths are just approximations and work people did decades ago but the internal workings of different valves from different vendors will make a difference.

For a full bore gate valve or ball valve this should be the same as pipe, but reduced bore, plug valves, globe valves etc just do a search and compare the lengths from each source and see if you get some sort of agreement.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[georgeverghese]

You may have to glean these numbers for each of these from vendor brochures and other design standards to develop a database and work out the range in values yourself. In some cases, you may find some values way off from the rest of the pack and these may have to be rejected, unless you can trace the large deviation to some mechanical quirk in the construction of this fitting or valve.