Static O-ring Groove design

[SMOKES]

Can some tell me why this type O-ring groove design see attached for static seal. Is Not in the Parker handbook?
Please note this is a legacy design and works up to 240 bar of pressure.

I understand that if the tolerances are wrong I will not get correct compression on the o-ring.
And other reasons?

 

[hydtools]

You are asking us to guess what the original designer was thinking.

Perhaps to create a seal gland without using a grooving tool.

Face seal or diametral seal? Have to guess what you are showing us.

Ted

 

[israelkk]

The seal grove doesn't have to be made off one piece

 

[SMOKES]

It a section view of a dimetrical seal. but one face and wall is formed on each part. the parker handbook does nt show this

 

[hydtools]

As long as the squeeze is good, the finishes are good, the extrusion gaps are good, the seal is good. Pay attention to the way pressure is applied to the seal. The length of the resulting gland is not as important as long as it is minimum or longer.
Look at the resulting gland when parts are assembled rather than strictly the gland configurations shown in any handbook, even Parker's. This gives you some design and manufacturing freedom to be creative.

Ted

 

[JJPellin]

I agree with Ted. This type of groove is still used by some pump manufacturers. As long as the seal compression and the width of the resulting groove are appropriate for the o-ring, it works reasonably well. The particular manufacturer that I know still uses this design does not reveal the reason. But, I suspect that the design of the rest of the system allows for some relative movement of the two parts. They accommodate the movement by over-compressing the o-ring and positioning the gaps so that the o-ring still won't extrude.

Johnny Pellin