Positive pressure relief valve

A positive pressure relief valve comprising:

• a valve assembly defining a valve throat between an inlet at an inlet end and an outlet at an outlet end,
• wherein the valve assembly comprises a main piston positioned at least partially within the valve throat, the main piston configured to selectively open and close the valve throat as a function of a pressure at the inlet,
• wherein the valve assembly comprises a set of throat inserts within the valve throat;
• a trigger mechanism comprising a trigger piston, wherein the trigger piston is configured to open at a predetermined pressure to pressurize a diaphragm associated with the main piston to open the valve throat as a function of a pressure at the outlet, wherein the trigger mechanism is positioned in a trigger mechanism housing at the outlet end of the valve assembly;
• an inlet manual override knob coupled to the main piston, wherein the inlet manual override knob is configured to pull the main piston from the inlet end, wherein pulling the main piston from the inlet end unseats the main piston to vent fluid through the valve throat;
• and
• an outlet manual override knob coupled to the main piston, wherein the outlet manual override knob is configured to push the main piston from the outlet end, wherein pushing the main piston from the outlet end unseats the main piston to vent fluid through the valve throat.