i think it's better to move posts that have nothing to do with the cryobug in a new topic or you cascade topic.
i would go with captube in an autocascade because they are self regulating.
especially when you get temps at your valve of around -140°C because if you do not have a perfect oil seperation your valve will freeze and is not adjustable anymore. so there is no difference between cpev, txv or eev.
the problem with eev is also that you need a controller with the p/t chart of your chosen refrigerant. i did not find a controller with charts of r170, r1150, r14, .....
i only saw controller that where able to deal with r23. so blends like you'll have to use in an autocascade are not available on the market either. maybe you can use an eev to adjust it by manually steps.
i also think that -150°C chamber temp is nearly not possible with r14 and r50. maybe with the need of argon, but high pressure will be too high in my opinion, when using these gases.
Bookmarks