using o-ring as pressure relief valve
using o-ring as pressure relief valve
(OP)
I have a set up where i am trying to use an o-ring as a pressure relief valve. My idea is to put the o-ring over a cyclinder (there is a grove machined in teh cylinder for teh o-ring). Does anyone have any expiereince with this? I am trying to find an equation that I can input material properties (mod of elasticity), the grove /cyclinder dimensions, and will output to me the pressure at which deformation (ie- pressure relif) will occur. I have researched this subject but havent come across anything for tehis specific application. Most i have found have been for teh forces and stresses for common o-ring sealing applicaions. Thanks!!





RE: using o-ring as pressure relief valve
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: using o-ring as pressure relief valve
RE: using o-ring as pressure relief valve
RE: using o-ring as pressure relief valve
RE: using o-ring as pressure relief valve
How cheap does this need to be? Understanding your application will help.
I happen to work in the hydraulic sealing industry, but I'm still pretty new at the job. We reject stuff all the time in our first article inspections because it is true that there are variations even within a single batch.
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To my knowledge, the following is my idea, but I can't guarantee that nobody else has done it. I hereby release it to the public domain, and I make no warranty, express or implied.
You might want to look into designing a seal groove with a notch (on the axial+radial plane) on one surface that stops just short of causing a leak. When the seal deforms under pressure, a clearance is created as the notch is exposed, thereby creating a passageway for escaping gases. What do you think?
RE: using o-ring as pressure relief valve
RE: using o-ring as pressure relief valve
There are several existing products that should meet your needs. Your application sounds like a rupture disc would work, they are not very expensive and are 1 use items, since once they break you buy a new one. Also, simple relief valves are not very expensive.
You also need to take care in insuring that the size of your relief is adequate for keeping the pressure below the desired set point.