FORCE REQUIRED TO SQUEEZE IN AN OVERSIZED SEALANT (BUNA N ELASTOMER) IN A PIPE 1

[John7474]

I am designing a jack screw. It pulls and pushes a pivot head inside a pipe.

The pivothead is basically a piston with sealant around it. The pivot head is smaller than the pipe, but the sealant is slightly larger than the pipe.

The jack screw basically pushes the pivot head with the sealant inside the pipe. In doing so, it has to squeeze in the elastomer inbetween the pivot head circumference and the pipe. Thus the sealant maintains the seal.

Is there a formula to calculate how much force is needed to squeeze elastomers in smaller holes?

This force would allow me to calculate the buckling strength of the jack screw arm.

 

[MiketheEngineer]

Even if you (we) could come up with a formula - it probably would be way off in real life. Build one and test it??

 

[John7474]

That is the actual plan. Decrease the gap between the pipe and pivot head and increase the oveall thickness of the sealant . Planning to do one at a time.

Just seeking advice.

 

[John7474]

oops...too many things in head....please disregard my commnet.

 

[MikeHalloran]

It would be simpler to just read the Parker O-Ring Handbook.


Mike Halloran
Pembroke Pines, FL, USA