One day I want to build a dream machine after I've accrued several machines and their (s)pare parts. Custom is always cooler. Even if its expensive. Haha
The pump idea is just a random thought. It would be much easier and cheaper to make a large boiler with large thermal inertia if the pump was after the boiler, because it would not need to bebuilt for so much pressure.
The pump idea is just a random thought. It would be much easier and cheaper to make a large boiler with large thermal inertia if the pump was after the boiler, because it would not need to bebuilt for so much pressure.
The boiler isn't built for pump pressure, but for internal steam pressure. Pump pressure isn't even a factor in boiler construction for espresso machines, AFAIK. You're not going to save any money on the boiler by putting the pump after it, plus you create the possibility of a much more catastrophic failure. A pump blowing up or leaking if it's pumping water at environmental temperature is much easier and safer to deal with than one that's pumping superheated fluid.
Depends on the machine and design, I think. I know that on my light-duty HX machine, there's a 2-way solenoid valve that makes sure the steam boiler is bypassed when it's pulling a shot, so the only pressure is in the HX pathway.
In the larger picture 150psi isn't that high a pressure. Scuba tanks, for example are rated somewhere upwards of 3000psi. Even "low-pressure" tanks for paintball guns are 300psi. Not that a high temperature rupture at 150psi can't be serious.
Makes sense. I'm probably going to have custom boilers machined when and if I ever get around to it. My dad owns a machine shop so I can source material pretty cheaply and get the work done for free.
What are the chances of being able to safely swap out the steam thermostat for one with a higher temperature to get more pressure? My delonghi has a 130C/257ºF thermostat for steam, so its only 1.2 bar of pressure. If I just went up a few degrees to 130 or 135 is there any chance of a catastrophic meltdown?
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