Seal friction 1

[TerryR1]

Is anyone aware of any literature on seal friction as applied to high pressure cylinders (~3000psi)?

I'm designing a light load passive heave compensator that uses a pneumatic cylinder. Cylinder stiction looks like it will cause problems, and I want to minimize it.

I found this book one here:

http://books.google.com/books?id=St...+seal+friction&ei=3knxS8rdGIquygTfpuSUCg&cd=2

Not sure how useful it may be.

We estimate that it takes 30-50psi to overcome stiction, semi-dependent on cylinder bore size. My math so far shows that stiction is proportional to fluid pressure and to the ratio of seal width to bore diameter.

Input much appreciated!

 

[iainuts]

Download the Parker O-ring handbook. Check section 5, esp. 5.11.

http://www.parker.com/literature/ORD 5700 Parker_O-Ring_Handbook.pdf

 

[Dallaseal]

Google two articles:

Itzhak Green: "Analysis of Elastomeric O-ring Seals in Compression Using the Finite Element Method"

"Stresses and Deformation of Compressed Elastomeric O-ring Seals"

 

[dsheets05]

Do you still need help with this calculation. Please let me know and I will work up a calc for you.

 

[TerryR1]

I am very interested in this subject.

I took Parker's equations and came up with some guestimates, but they didn't seem to match what we are experiencing empirically.

 

[johnchrc]

Need more info. 30-50 psi sounds very low to overcome friction at 3,000 psi. What is your seal diamter and size? Are you using o-rings, T-seals or custom engineered seal?

As mentioned in previous post, PARKER has the calculation for static and dymamic friction.

We have used coatings like flourolon 325 (see SW Impreglon) which are durable, protect against corrosion and keep the friction coefficient down.

I would discuss with Parker or Greene Tweed rep.