Many/Most bidirectional high-performance butterfly valves can act for dead-end service, if you mean end-of-pipe service. However, they are frequently de-rated because if they are installed with the shaft upstream, the pressure tends to unload the seat retainer. Options are offered for a bolted seat retainer, but quite franlkly the easiest and most reliable way to install one is with a flange bolted to the seat-retainer side of the valve. The flange gives the seat retainer the support needed so that the valve is rated for full pressure in either direction. That being said, the preferred direction is still with the seat Upstream of the shaft, if for no other reason than to take the pressure off the packing while the valve is closed.
If the end-of-pipe is going to be there for a while, and the line is in service, you may wish to consider blind flange at the end-of-pipe if leakage is a concern. Valve leak.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?
I am evaluating a specific high performance butterfly valve bid. One page of the brochure states "For bidirectional dead end service, you must use body type .., ..., or
.... valves. These valves have retainers specially designed for such service. Use or ..... valves in such service will
result in massive leakage."
