Metal-to-Metal Radial Seal I nee 1

[Hush]

Metal-to-Metal Radial Seal

I need a metal-to-metal, static, 10000-psi, radial seal. I have control over the OD dimensions but the 7” ID may vary +/- 1% on diameter, may be out of round +/- 1%, and may be slightly off centre. Has anyone ever seen anything that might work in an application like this?

 

[MARK060367]

I am not sure of your full application but the link below is for a company which has supplied dedicated seals to high pressure applications

http://www.vectorint.co.uk/

 

[JamesBarlow]

I have designed radial seals up to 60,00 PSI. We could go higher but have never had the need.

We use a close toleranced metal ring with o-rings. The o-rings seal up to 1500 PSI. You must design the ring so that it will expand and fill the gap, creating a metal seal, before you reach the limits of the o-ring.

The equations for the ring are easy to develop and can also be found in any Strength of Materials Text.

 

[Hush]

JamesBarlow,

The close tolerance of the seal you're describing won't work for me in this case but the o-ring assist sounds promising. Maybe something along the line of a pressure energized U-cup using an o-ring for the initial seal.

Much appreciated.

 

U cups can take a lot of punishment, but you're talking about a +/- 1% on 7 inches!!! I don't know of any available piston cup or u-cup that can stand against a potential 140/1000 gap under 10,000 psi. Yikes! Good luck. You really do need a custom seal, or tighten tolerances.