Dome-loaded back pressure regulator with setpoint pressure energized by process fluid

A diaphragm pressure regulator, comprising:

• a body defining a process surface and including:
• an exhaust port having a discharge opening communicating with an exterior of the body, and at least one vent void in the process surface communicating with the exhaust port;
• and
• an inlet port having an inlet opening communicating with an exterior of the body, and at least one process void in the process surface communicating with the inlet port;
• a reference housing including a cavity defining a reference surface and a reference port in fluid communication with the cavity and an exterior of the reference housing;
• and
• a diaphragm having opposed reference and process sides disposed between the body and the reference housing such that the process side contacts the process surface, the diaphragm movable between a first position engaged with the at least one vent void, and a second position wherein the diaphragm is not engaged with the at least one vent void, wherein a dome is defined between the cavity and the reference side of the diaphragm, wherein the diaphragm pressure regulator is oriented such that the diaphragm extends in a vertical direction;
• and
• wherein the reference housing includes a sump configured to segregate liquid from the reference side of the diaphragm, wherein the sump is located asymmetrically with respect to the diaphragm.