Anybody have any first hand experience with PTFE w/ stainless shell in hydraulic steering application? (Same stuff commonly used on brake lines in a -3 flavor)
I have a couple of short flex hoses in my system and the traditional crimp/black 1 wire or 2 wire hose is just too stiff. I'm worried about breaking fittings and I've already had one hose crack against the crimp where it was exceeding it's working angle I guess.
The steel PTFE fittings are much smaller and the hose seems nice and flexible.
The hose I have has a working pressure of 2500 and I'm sure a higher spike. Seems like it'd handle the job.
We had several of those lines fail in our steering system. Why not just go with the same stuff everyone else is using? It's durable and easy to get in a pinch. Sold by a ton of vendors. Used by a ton of people.
If your hose has any friction it can attack the wires directly and then blow out. Hydraulic hose is normally rated for 4 times it WP to get to burst. 2000 psi SS/PTFE braid might only be 500 psi rated.
I tried it too. It worked fine for a while. One day I hit something fairly hard which spiked the pressure and ruptured the hose. Replaced it with my spare and drove about 100' and the other hose blew. They were the hoses to a DE ram full hydro
If your hose has any friction it can attack the wires directly and then blow out. Hydraulic hose is normally rated for 4 times it WP to get to burst. 2000 psi SS/PTFE braid might only be 500 psi rated.
middle of the hose, any ptfe hose wont tolerate being kinked hard, then again rubber stuff don't like it either. it is the same hose we use for nos systems 1200+ psi easy, it is also good for ethanol based fuels..
Hose diameter has a large effect on pressure rating. Hydraulic rated hose is designed for impulse loads. WP of other hoses might drop if rated to the same standards. I have seen multiple blown SS braid lines with low pressure that had short term wear or got a kink.
I replaced all my SS braid with rubber to safeguard the unknown friction that causes a blowout. It's easy to see wear on a rubber hose, difficult on SS braid.
Steering loads in a kick back can spike psi well above pump operating pressures.
Reservoir to pump or return is not subject like cylinder to valve spikes.
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