A valve comprising: a valve body forming a channel defining a fluid flow path extending from an inlet port of the valve body to an outlet port of the valve body via a gallery of the valve body that is disposed between the inlet port and the outlet port, the valve body further defining an opening disposed in communication with the gallery, wherein the fluid flow path is adapted to allow a fluid to flow through the valve body in a first direction and a second direction opposite the first direction; a valve assembly adapted to be at least partially disposed through the opening and in the gallery of the valve body, wherein the valve assembly comprises a valve bonnet, a valve stem movable between a first position and a second position, the valve stem having a central longitudinal axis and at least one opening extending along a lateral axis transverse to the central longitudinal axis and including a first telescoping component having a central longitudinal axis and forming at least one opening through a cylindrical surface thereof and a second telescoping component having a central longitudinal axis aligned with the central longitudinal axis of the first telescoping component and forming at least one opening through the cylindrical surface thereof, wherein one of the first telescoping component or the second telescoping component is fixed to the valve bonnet, and the other of the first telescopic component or the second telescoping component is slidably displaceable relative thereto, the at least one opening extending a through a surface of the first telescoping component and the second telescoping component, and a valve disc coupled to the valve stem wherein the valve disc is spaced from a valve seat of the valve body when the valve stem is in the first position and the valve disc is in contact with the valve seat when the valve stem is in the second position; and a fusible element adapted to be disposed through the at least one opening of the first telescoping component and the second telescoping component to act as a lock or stop and maintain the valve stem in the first position; wherein the fusible element is adapted to fail when contacted by a fluid traversing the fluid flow path in the second direction to allow the valve stem of the valve assembly to move to the second position. a valve body forming a channel defining a fluid flow path extending from an inlet port of the valve body to an outlet port of the valve body via a gallery of the valve body that is disposed between the inlet port and the outlet port, the valve body further defining an opening disposed in communication with the gallery, wherein the fluid flow path is adapted to allow a fluid to flow through the valve body in a first direction and a second direction opposite the first direction; a valve assembly adapted to be at least partially disposed through the opening and in the gallery of the valve body, wherein the valve assembly comprises a valve bonnet, a valve stem movable between a first position and a second position, the valve stem having a central longitudinal axis and at least one opening extending along a lateral axis transverse to the central longitudinal axis and including a first telescoping component having a central longitudinal axis and forming at least one opening through a cylindrical surface thereof and a second telescoping component having a central longitudinal axis aligned with the central longitudinal axis of the first telescoping component and forming at least one opening through the cylindrical surface thereof, wherein one of the first telescoping component or the second telescoping component is fixed to the valve bonnet, and the other of the first telescopic component or the second telescoping component is slidably displaceable relative thereto, the at least one opening extending a through a surface of the first telescoping component and the second telescoping component, and a valve disc coupled to the valve stem wherein the valve disc is spaced from a valve seat of the valve body when the valve stem is in the first position and the valve disc is in contact with the valve seat when the valve stem is in the second position; and a fusible element adapted to be disposed through the at least one opening of the first telescoping component and the second telescoping component to act as a lock or stop and maintain the valve stem in the first position; wherein the fusible element is adapted to fail when contacted by a fluid traversing the fluid flow path in the second direction to allow the valve stem of the valve assembly to move to the second position.