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Gasket Oversized

Gasket Oversized

Gasket Oversized

(OP)
Hi Gents,
I'd like to know what can happen if I install a oversized gasket (AISI 316) between body and bonnet of a gate valve (F6NM). Any consideration will be appreciated

Wreg

RE: Gasket Oversized

What do you mean by oversized?
If its a different diameter it probably won't seal.
If its a different height it may not drift, unless its reverse acting, in which case the vbsm may not seal.

RE: Gasket Oversized

(OP)
I'm speaking about conical gasket with the external diameter oversized. I want to do this to well energize the gasket but I'm not sure that this will solve my problem. Have you any experience on this?

RE: Gasket Oversized

Assuming you have a face to face makeup between the body and bonnet the result would be increased bolting stresses and an increase in stress in the hub of the bonnet. As long as the increase in size is 'slight' the increased stresses shouldn't be enough to worry about.

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