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These regulators should not generally be changed. If they are bumped or accidentally changed follow this to reset them. Lower the dewar pressure at least 0.5 psi from the setpoint so that the inlet flow control is open all the way (easier in manual mode). It is usually useful to open the outgoing flow all the way too (60 in and 60 out) If the pressure jumps up when the flow controller opens then close the regulator down (turning to the left). If the flow is not able to reach the max (60 slm) that the flow control wants then gradually open the regulator (turn to the right) until the flow just nearly reaches 60 slm. In principle if one wants to operate the liquifiers at a higher or lower pressure you would need to reset these regulators so that at the new pressure they just barely open to 60 slm when the MFC is wide open. One may want to change the pressure to achieve optimal production rate or other possibilities. But once set for a particular pressure they should be good to go.