Its classified as a fixed meter device and a TXV is classified as
modulating. I suppose you could say a cap tube is more of a pressure
reducing device but I wouldnt try to stretch that to mean modulating.
I know where you are trying to go with this modulating bit but it
doesnt really modulate open to closed or vise versa the way a TXV
The inlet pressure determines the flow rate and the modulation of the
flow rate is dependant on the bubble length of the cap tube.
Thats not true, the flow rate is determined by the quantity of the
bubbles in the bubble length. and thats what modulates, the amount of
gas in the tube, because vapor travels at a different speed than liquid
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