flare fittings - which angle?

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rudd
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flare fittings - which angle?

Post by rudd »

Valve gear is about wrapped up, I need to start thinking about chassis on air.
I see flare fittings are recommended in the smokebox, there are 37 degree and 45 degree flares, The 37 supposedly holds more pressure but requires sleeves.
What are folks successfully using?
thanks
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Bill Shields
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Re: flare fittings - which angle?

Post by Bill Shields »

Whatever I have in the bucket of fittings. At our pressures it makes no difference
Too many things going on to bother listing them.
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Steggy
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Re: flare fittings - which angle?

Post by Steggy »

As Bill says, pressures are not high enough to influence your choice.

That said, the JIC (37°) flare is mechanically more robust that the SAE (45°) flare, and better resists vibration.
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pat1027
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Re: flare fittings - which angle?

Post by pat1027 »

As hydraulic pressures increased in the 30' & 40's heavier wall steel lines were prone to cracking if flared to 45 degrees. The 37 degree fitting superceded the 45 degree for most flared hydraulic fitting. The 45 degree is common in automotive and refrigeration applications. Parker used to tell us 45 was superior for sealing but 37 was the maximum for steel but they never published anything on this. The sleeve helps align the tube and resist vibration.

For a smoke box either will work.
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