A valve, comprising: a housing defining an inlet passage and an outlet passage; and a plug assembly disposed within the housing and comprising: a plug reciprocally moveable between a closed position whereat the plug is operative to prevent the flow of fluid from the inlet passage to the outlet passage, and an open position whereat fluid is able to flow from the inlet passage into the outlet passage; a piston head cooperatively engaged to the plug such that the selective application of fluid pressure to the piston head is operative to facilitate the movement of the plug between the closed and open positions; and a hub cap defining a central bore, a piston rod being advanced through and reciprocally moveable axially within the central bore; wherein the piston head and the plug are attached to the common piston rod which facilitates the operative connection of the piston head to the plug; wherein the plug comprises: an end portion; and an annular sidewall portion integrally connected to the end portion; wherein the hub cap defines an annular channel sized and configured to accommodate the sidewall portion of the plug when the plug is moved to the open position; and wherein the plug assembly further comprises a piston sleeve which at least partially defines a piston chamber, the piston head being reciprocally moveable axially within the piston chamber. a housing defining an inlet passage and an outlet passage; and a plug assembly disposed within the housing and comprising: a plug reciprocally moveable between a closed position whereat the plug is operative to prevent the flow of fluid from the inlet passage to the outlet passage, and an open position whereat fluid is able to flow from the inlet passage into the outlet passage; a piston head cooperatively engaged to the plug such that the selective application of fluid pressure to the piston head is operative to facilitate the movement of the plug between the closed and open positions; and a hub cap defining a central bore, a piston rod being advanced through and reciprocally moveable axially within the central bore; wherein the piston head and the plug are attached to the common piston rod which facilitates the operative connection of the piston head to the plug; a plug reciprocally moveable between a closed position whereat the plug is operative to prevent the flow of fluid from the inlet passage to the outlet passage, and an open position whereat fluid is able to flow from the inlet passage into the outlet passage; a piston head cooperatively engaged to the plug such that the selective application of fluid pressure to the piston head is operative to facilitate the movement of the plug between the closed and open positions; and a hub cap defining a central bore, a piston rod being advanced through and reciprocally moveable axially within the central bore; wherein the piston head and the plug are attached to the common piston rod which facilitates the operative connection of the piston head to the plug; wherein the plug comprises: an end portion; and an annular sidewall portion integrally connected to the end portion; wherein the hub cap defines an annular channel sized and configured to accommodate the sidewall portion of the plug when the plug is moved to the open position; and wherein the plug assembly further comprises a piston sleeve which at least partially defines a piston chamber, the piston head being reciprocally moveable axially within the piston chamber. an end portion; and an annular sidewall portion integrally connected to the end portion; wherein the hub cap defines an annular channel sized and configured to accommodate the sidewall portion of the plug when the plug is moved to the open position; and wherein the plug assembly further comprises a piston sleeve which at least partially defines a piston chamber, the piston head being reciprocally moveable axially within the piston chamber.