Abstract: A valve assembly including a trigger mechanism for use in controlling the supply of a compressed gas to a gas activated device, including a valve body including an inlet port for connection to the supply of compressed gas and at least one outlet port for connection to the gas activated device and with an internal recess coupled to the inlet and outlet ports, a valve member located within the recess in the valve body and intermediate the inlet and outlet ports and with the valve member having a closed position providing for no path between the inlet and outlet ports and having an open position providing for a path between the inlet and outlet ports, a spring member coupled between the valve member and the valve body for providing a force for normally moving the valve member from the closed position to the open position, a trigger mechanism mounted on the valve body and including an armed position with the trigger mechanism locked and a fired position, and with the trigger mechanism coupled to the valve member