This note describes passive pressure reduction devices for use with sensitive instruments. Two gas circuits are developed which not only provide a pressure reduction under flow demand, but also limit the maximum pressure that the source can exert under a no-flow condition. The first design approach presented is a method that involves conventional orifices in a pressure divider network analogous to a voltage divider in electronics. The second method detailed, utilizing the discharge end of a jet pump, amplifies the mass flow rate of the source, reduces the source pressure at free delivery, and limits the pressure at shutoff.