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Anonymous Poster

Butterfly Position during Torquing

04/29/2009 1:13 AM

Dear all,

when we torquing the Wafer type butterfly valve in pipeline, what will be the position of butterfly.It will close, full open or 10% open.

Best regards

Zia
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Stinky Pete
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#1

Re: Butterfly Position during Torquing

04/29/2009 3:13 AM

When closed it will be 0% open, and when open it will be 0% closed. Or am I missing something?<Cough, wheeze>

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PWSlack
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#2

Re: Butterfly Position during Torquing

04/29/2009 3:23 AM

The position of the disc and the position of the handle are intimately related, as they are connected to each other by the spindle.

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Anonymous Poster
#3

Re: Butterfly Position during Torquing

04/29/2009 4:38 AM

Doesn't matter. That is if you mean while you are bolting up the flanges.
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pipeit
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#4

Re: Butterfly Position during Torquing

05/08/2009 2:06 PM

We were taught 10% open:

As the valve is faced up the orifice reduces at the center of the valve,so when it is put in full close position it has the maximum effective seal.
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