In the image, you can see that the valve pin assembly is outlined in yellow. There is a larger diameter cup that seals against the regulator seat oring. This is the part that was earlier referred to as the poppet. When the regulator piston springs exert more force on the regulator piston assembly than the air pushing out, the valve pin assembly cup is pushed forward away from the regulator seat oring. This allows air to flow from the tank inlet into the air passage leading to the top of the on-off pin. It doesn't show well in the diagram, but the air flows between the inside of the regulator seat holder and the valve pin.
The on-off pin is solid. When the trigger is held and the sear is rocked to the back, the on-off pin is held in the up position such that it closes the seal at the small top on-off oring. No air can pass when the on-off pin is up. When the trigger is released, the on-off pin is pushed down away from the seal and air flows around the pin, down through the on-off top and into the front chamber. This same air also goes through the valve pin assembly and exerts force on the regulator piston assembly.
Its the air pushing the regulator piston assembly that counters the regulator springs. When the chamber pressure force is equal or greater than the spring pack force, the "poppet" is closed.
The on-off pin is solid. When the trigger is held and the sear is rocked to the back, the on-off pin is held in the up position such that it closes the seal at the small top on-off oring. No air can pass when the on-off pin is up. When the trigger is released, the on-off pin is pushed down away from the seal and air flows around the pin, down through the on-off top and into the front chamber. This same air also goes through the valve pin assembly and exerts force on the regulator piston assembly.
Its the air pushing the regulator piston assembly that counters the regulator springs. When the chamber pressure force is equal or greater than the spring pack force, the "poppet" is closed.
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