So, my thought would be to have the tubing weighted down somehow so that the end of the tubing was always slightly below the actual liquid level of the refrigerant.

• 有一件事情必须很小心......油不会形成一个分离的层。他是一个很稠的混合层。如果桶的压力降低你可能会看到一些泡沫将会抬高这个浮球使他高出富油层。