|
This is an idea I've been wanting to make some CAD
models and drawings of for some time now. We have this big oval or rectangle
steel plate doors for the hyperbaric chambers, and it's expensive to machine the
doors and seating flanges flat, plus cut the O-ring groove. Even then the welded
in door frame can and usually warps some. Once welded in the door frame is very
hard to machine. The concept shown in the below pictures and
drawings, is showing a K-350 type hatch and hatch land, that have two rolled
1/4" SS rod rings, that are TIG welded onto the hatch flange, and two on the
hatch land. The two on the hatch land are to form a dam for Sekaflex, that
you caulk in there and level off. Then to allow the upper SS rings to seat
down into the Sekaflex enough to take up any warp in both flanges and not stick
to the Sekaflex while it is curing, you apply mold release to the SS rings, and
then spray them with PVA mold release agent and let that dry. Then before
the Sekaflex is caulked into the lower rings, you lower the hatch and figure out
what spacers you need to keep if from going down to far into the urethane. Then
add the Sekaflex of the type of hardness you want, and lower the hatch, which is
attached at the hinge to keep every thing lined up, and set the hatch down on
your taped or clamped on spacers, and let it cure.
One could use just one upper SS sealing ring as you
can see in the drawing of a large WWII ballast tank flapper valve. But I
like the primary and secondary sealing means, and it evens out the stresses
more.
" Stand still.
The trees ahead and bush beside you are not lost." ~ Albert
Einstein
Regards
Szybowski |