Abstract: A non-refillable valve for a pressure container, which comprises a non-refillable device comprising of a spring loaded port sealing member having an end T-piece and a plug to hold the spring is provided at the outlet nozzle such that when the valve is in the active position of filling, the stem of the spindle is in the lifted position and the port sealing member is in the pulled position by means of the spring, thereby providing a communication between outlet nozzle and the container for filling and after completion of filling, the end T-piece is pulled and cut off whereby the port sealing member gets retracted, because of the spring, to seal the side port and thereby preventing the flow of fluid in the filling direction while permitting flow of fluid in the opposite direction for discharging.