Butterfly valve disc/shaft connection
Butterfly valve disc/shaft connection
(OP)
According to API609, the butterfly valve shaft to disc connection shall be designed to prevent loosening due to vibration. What will happen if loosening occur? What is the aim for this requirment?
Thanks
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RE: Butterfly valve disc/shaft connection
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RE: Butterfly valve disc/shaft connection
If the disc can move in the shaft direction, is this allowed?
RE: Butterfly valve disc/shaft connection
http://www.cgmpvalve.com/
Dosn't look like they can move in that direction to me. Maybe some manufacturer's specialist can confirm that.
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RE: Butterfly valve disc/shaft connection
RE: Butterfly valve disc/shaft connection
Even if that does not happen, The valve will not perform its intended function if it is not firmly secured to the shaft.
There are many ways of securing the vane to the stem. Tapered pins driven through the centerline are the most obvious, but lowest strength method. Torque plugs, tangential pins, and Gibb Keys all present greater surface area to resist shear without weakening the stem as much as drilling thru for tapered pins.
RE: Butterfly valve disc/shaft connection