I just disassembled the spare TXV I've been holding onto for a "project". Unscrewing the round brass plug you can pull out a spring tensioned ball valve actuated by a two piece rod going thru the length of the TXV from the aerobic capsule/capillary tube to the ball valve under the plug.

The first piece of rod moves when the capsule/capillary gas expands, affected by the temperature of the gas EXITING the
TXV.

The first piece pushes the second length of rod thru an orifice that only grossly controlls the amount of refrigerant ENTERING the TXV. This part is not controlling much at all; it's just mostly a passageway.

However, the end of this rod (under the brass screw plug) pushes on the ball valve which is under spring tension. The amount of tension is determined by the amount the round plug is screwed or unscrewed into the TXV body. The amount that this ball is lifted off it's seat is what really controls the amount of refrigerant ENTERING the evaporator and it is controlled by the temperature of the refrigerant gas EXITING the evaporator (acting on the capsule which acts on rod # 1, which acts on rod #2, which acts on the ball, which chills the capsule, which shortens the rod #1, which.........oh, what the heck). A nice simple feed-back.

Bottom line is the plug seems to be able to control it to conform to most any regular refrigerant gas.

IF YOU ADJUST THE PLUG TO ALLOW MORE REFRIGERANT INTO THE EVAPORATOR YOU RUN THE VERY REAL RISK OF "SLUGGING" AND RUINING YOUR COMPRESSOR SINCE LIQUID REFRIGERANT CAN GET TO IT (low/no superheat). FWIW

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)