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Groove dimension for Internal and External pressure (Vaccum)

Groove dimension for Internal and External pressure (Vaccum)

(OP)
Hello!
I'm constructing a pressure vessel which is intended to work with both- internal pressure (4 bara) and vacuum (~0,2 bara)- (not simultaneously of course).
The vessel have normal flange and cover (static- axial sealing).
When i look at the catalogs, manufacturers always separate internal and external pressure applications so i can not find any recommendations for groove dimension in this case.

I would appreciate the answer. Thanks in advance.

RE: Groove dimension for Internal and External pressure (Vaccum)

" groove dimension "

Are you using o-rings?

RE: Groove dimension for Internal and External pressure (Vaccum)

(OP)
Yes, i use O-rings.

RE: Groove dimension for Internal and External pressure (Vaccum)

(OP)
Maybe O-ring is not the best solution when dealing with both vacuum and internal pressure?
Did anyone had a similar problem?

RE: Groove dimension for Internal and External pressure (Vaccum)

O-rings can handle pressure in either direction and with the direction changing. With changing directions, it is more important to design the groove to tight tolerances to minimize the o-ring movement that will occur. The movement will cause more wear on the ring.

RE: Groove dimension for Internal and External pressure (Vaccum)

(OP)
Compositepro, thank You for your answer!
That means that for example for O-ring ø188x4 (188- internal diameter) i need a groove ø196/ ø188? (with standard depth)
I am asking that because every O-ring manufacturer recommended that a groove should not be filled more than 85% or significant damage on O ring can occur.

RE: Groove dimension for Internal and External pressure (Vaccum)

The actual diameters of your groove will depend on your cross sectional width of your o-ring. Also is this a face o-ring or on a shaft/hole?
If you have a copy of BS1806: 1962 this will give you the dimensions you need, alternatively I just found this online www.applerubber.com/src/pdf/seal-design-guide.pdf

If it was me I find 3.53 mm o-rings work well around the pressure you are talking about.

Also I generally have the ID machined slightly bigger than the ID of the O-ring, this stretches the oring a bit and just helps hold everything in place during assembly

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