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Can Bi-directional high performance butterfly valve supplies dead end
3

Can Bi-directional high performance butterfly valve supplies dead end

Can Bi-directional high performance butterfly valve supplies dead end

(OP)
services?

Thanks

RE: Can Bi-directional high performance butterfly valve supplies dead end

Huh?

RE: Can Bi-directional high performance butterfly valve supplies dead end

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.  

RE: Can Bi-directional high performance butterfly valve supplies dead end

(OP)
Thanks JimCasey.

So, the shut-off pressures at diffrent sides are not the same value.

RE: Can Bi-directional high performance butterfly valve supplies dead end

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
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RE: Can Bi-directional high performance butterfly valve supplies dead end

Yes they can, but you MUST specify as many of the manufacturers do not do it as standard in "both" directions.

They must change something, add something, or test differently.

MARKFLOW

RE: Can Bi-directional high performance butterfly valve supplies dead end

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."

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