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Plug Valve Designs

Plug Valve Designs

Plug Valve Designs

(OP)
Hi all,

I posted this on the valve engineering board and thought I might get some good information here as well.

I am working on updating our specifications for plug valves for sewage treatment and have a question.  There seems to be two main types of plug valves, rectangular ported and round ported.  I have heard that round ports are better for plug valves because the head loss is less, and I have heard that rectangular ports are better because they have better sealing characteristics.  In addition, to get a full port size with a rectangular shaped port, you have to go one size larger.
 
Can I ask which type of plug valve you all prefer, and why?  Are there other characteristics of a plug valve that are more important than port shape that I want to be sure and include in my specs?
 
Thanks for any guidance you can provide.

Volucris

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