Choke valves are generally sized in the same way as control valves. This is usually done using sizing software that is specific to the manufacturer. The parameters that go into the program are fairly complex depending on the complexity of the process requirements. I have been working with choke...
I would suggest that dual plate wafer check valves are worth considering for Steam applications.
These are much lighter than traditional swing check valves and have better response times.
For steam service normally the seat faces are hard faced (Stellite).
The two major manufacturers of this...
You can also find a very good description of both single and double piston effect in the Velan API 6D ball valve catalogue
http://www.velan.com/products/pdfs/vel-bv6d-web.pdf
Good luck
:-D
For Ball and Gate Valves
Your could try
Petrol Valves from Italy
http://www.petrolvalves.it/index.asp
Also Bel Valves from the UK
http://www.belvalves.co.uk/index.html
Best of luck
Dear pipexp
Select valve from a reputable brand, allow enough time in your project schedule and join the queue. There are good reasons why the best manufactures have full order books and normally it comes down to reliability.
Dear Washl
The Serck Audco super H pressure balanced plug valve is worth considering for your abrasive service HP application the body internals can be hard faced for extra errosion protection.
follow the link below...
Dear Cadymp
The main rising stem ball valve is the Orbit Valve (now part of Cameron).
See the following link.
http://c-a-m.com/content/vm/prv/index.cfm
Devlon-V is Polyamide-Nylon
Good for max temp of 311 Deg F
and max pressure of aprox 6000 PSI
(source Starline Catalogue)
Colour is Yellow
Characteristics
- similar high performance levels as S grade, but has been specifically tailored for high temperature/pressure applications
-...
