Lip seal design for ball valevs

[ENPMAT]

Hi all;
Does anyone know a good reference explaining lip seal design for ball valves ?
Thanks

 

[hsbcn]

THough commercially oriented, this Parker brochure will be of interest to you:

http://www.parker.com/literature/Engineered Polymer Systems/5340_2008.pdf

My focus is on valve stockists in the us and uk who supply duplex and super duplex valves, and inconel and hastelloy valves, plus titanium, alloy 20 and 904L valves.