Abstract: Disclosed is a programmable pressure regulator for a titanium superplastic forming apparatus. The regulator meters an inert gas, such as argon, into and out of a forming chamber to vary the pressure according to a preselected pressure profile. A profile generator generates high and low set point pressure signals which vary in accordance with the preselected pressure profile. A pressure transducer provides an electrical signal representative of the pressure in the forming chamber. A comparator circuit compares the electrical signal from the pressure transducer with the high and low set point signal and energizes pressure and bleed gas solenoid valves to maintain the pressure in the chamber within the pressure limits defined by the set point signals.