Before reading it understand what is pressure regulator?
Back pressure regulator
Designed to modulate to hold a specific back pressure Monitors and regulate upstream pressure Aka reverse acting regulators Droop = Build up
Dome Loaded PRV Eliminating spring - Extremely accurate Air signal across top of diaphragm Needs an air regulator or I/P faster than a control loop Increased rangeability Low minimum delta P requirement Good for frequently changing setpoint or remote installations
Tank Blanketing Regulator Gas blanketing or other low pressure air / gas applications Extremely large elastomer diaphragms for increased sensitivity Very light springs