Most every other metal part that is joined to another metal part and seals in a fluid, uses some gasket. Why don't brake lines with bubble or inverted flare fittings use a gasket? I think I know but what do others say?
Still metal to metal.Because the double flare or bubble seals.
Water pumps, exhaust manifolds, oil pans. Their gaskets are failure points but they still use them.Also, gaskets and seals would be another failure point.
Many metal to metal seals have a ball and seat profile/interaction whereas they “coin” when made up tight …Theory, the pressure in the line actually tightens the seal.
I expect the line expands a bit under pressure and that presses the flare harder into the flare nut and fitting.
But that's just my theory. Maybe someone who designs hydraulic systems can confirm or deny.
Those are large items that are prone to warping or poor machining tolerances. At least with brake lines they are sort of malleable and mesh together to form a tight seal.Still metal to metal.
Water pumps, exhaust manifolds, oil pans. Their gaskets are failure points but they still use them.
They had Morton-Thiokol design some special o-rings.I wonder what kinds of fittings are they using on the Artemis1 moon rocket that's been delayed due to leaks?
Lots of high pressure hydraulic hose fittings are metal to metal.Still metal to metal.
Water pumps, exhaust manifolds, oil pans. Their gaskets are failure points but they still use them.
There are actually quite a few exhaust manifold applications where there is no gasket from the factory.Still metal to metal.
Water pumps, exhaust manifolds, oil pans. Their gaskets are failure points but they still use them.
I guess the difference is those examples are not high pressure components?Still metal to metal.
Water pumps, exhaust manifolds, oil pans. Their gaskets are failure points but they still use them.
There also is the component of heat expansion and contraction in those parts, not so much a brake line.I guess the difference is those examples are not high pressure components?
JIC 37degree. On our power plant Electro Hydraulic Control Unit that supplied oil pressure for main steam turbine control and stop valves, all the connection were Parker Four Bolt flange connection that used an O ring. 3000 psig.Lots of high pressure hydraulic hose fittings are metal to metal.