Small valve sizes 1

[j.doe]

Hi,

I was wondering how small a valve inlet can be made if the fluids to be inserted from the valves are dry nitrogen, kerosene or refined diesel(?) and r134a (5 bar saturation pressure). The temperature of the setup is 25C. Ideally, I'd like the inlet diameter to be 1mm or less for my application but I'm not sure if you can have such a small inlet for these fluids or what the effects would be. Thanks in advance.

 

[btrueblood]

Both of those fluids are routinely pumped through much smaller orifices at a few bars of pressure (spray nozzles in burners for diesel/kerosene, and expansion orifices in AC systems for R134a). Pull a vacuuum in the space first would be my suggestion, and then do a repeat vaccuum/fill operation to try and pull any residual bubbles out.

 

[j.doe]

@btrueblood thanks a lot for your helpful answer, can I ask how small the size of the orifice you would recommend before any electrostatic or other physical effects take hold on the fluids? What effects are involved as a result of such an orifice do you think. The effects I would especially be looking to limit are those that would affect the accuracy when measuring the electrical conductivity of the fluids (r134a/kerosene/diesel).