in h
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Basically, there are two pressures for the gas.Right. In that case how does the gas get into your system via the remote filler that you connect it to with this connector hose ?
The bottle pressure is the vapourising pressure of the liquid gas. That's usually from 10psi to over 300 psi*, solely depending on the temperature of the surface of the liquid. It is not dependent on the amount of gas in the bottle, though the temperature will drop dramatically as the liquid runs out.
The regulator takes this huge and varying pressure in, and puts out a very steady, low pressure of a little under 0.5psi
What you can do is add an external barbeque point to the side of the van. If the tank gas runs out, you connect the output of the regulator on the top of your bottle to the external gas point, so you feed the gas in backwards through the BBQ fitting.
There is no way that this could refill the tank: it can only supply gas for immediate use.
In theory, you could connect the high pressure output of the bottle to the fill point of the tank. As long as you have the bottle upside down as you do it, the liquid gas could flow down into the tank. I think it would work best if the bottle had been stored in a warm place for a few hours first.
In practice, this is a very dodgy thing to do unless you are very sure you know what you are doing. I once had a job topping up gas bottles for hire boats, and we used to be very careful to weigh them to make sure they weren't overfilled. That's not possible with an underslung tank.
*Most tanks have a safety valve set to release pressure at a bit over 400 psi, but I'm not sure that bottles do.