A valve comprising, - a body; - a passageway defined within the body, wherein the passageway includes an inlet and an outlet; - a sealing member configured for displacement between a closed position and an open position, wherein in the closed position, the sealing member prevents fluid communication between the inlet and outlet of the passageway, and in the open position, the inlet and the outlet of the passageway are disposed in fluid communication; and - a trigger, including a displaceable interference-effecting trigger portion configured for displacement from a first trigger position to a second trigger position, wherein the displaceable interference-effecting trigger portion cooperates with the sealing member such that, while the displaceable interference-effecting trigger portion is disposed in the first trigger position, the displaceable interference-effecting trigger portion effects interference with displacement of the sealing member from one of the open position and the closed position to the other one of the open position and the closed position, and while the displaceable interference-effecting trigger portion is disposed in the second trigger position, the interference effected by the displaceable interference-effecting trigger portion, is removed; wherein, while the displaceable interference-effecting trigger portion is disposed in the second trigger position, the sealing member is displaceable from the closed position to the open position in response to a pressure differential, existing between the inlet and the outlet, which is greater than a minimum predetermined threshold pressure differential; and wherein the trigger further includes a temperature responsive trigger portion including a plurality of constituent trigger segments connected to one another in series, the constituent trigger segments including a plurality of temperature responsive trigger segments; and wherein each one of the temperature responsive trigger segments, independently, including a composite material, the composite material including: (a) a shape changing material-comprising component configured to assume a change in shape in response to receiving of heat energy by the temperature responsive trigger segment, and (b) a relatively inelastic material-comprising component; wherein the relatively inelastic material-comprising component has either: (a) a modulus of elasticity that is greater than the modulus of elasticity of the shape changing material-comprising component, or (b) a stiffness that is greater than the stiffness of the shape changing material-comprising component. - a body; - a passageway defined within the body, wherein the passageway includes an inlet and an outlet; - a sealing member configured for displacement between a closed position and an open position, wherein in the closed position, the sealing member prevents fluid communication between the inlet and outlet of the passageway, and in the open position, the inlet and the outlet of the passageway are disposed in fluid communication; and - a trigger, including a displaceable interference-effecting trigger portion configured for displacement from a first trigger position to a second trigger position, wherein the displaceable interference-effecting trigger portion cooperates with the sealing member such that, while the displaceable interference-effecting trigger portion is disposed in the first trigger position, the displaceable interference-effecting trigger portion effects interference with displacement of the sealing member from one of the open position and the closed position to the other one of the open position and the closed position, and while the displaceable interference-effecting trigger portion is disposed in the second trigger position, the interference effected by the displaceable interference-effecting trigger portion, is removed; (a) a shape changing material-comprising component configured to assume a change in shape in response to receiving of heat energy by the temperature responsive trigger segment, and (b) a relatively inelastic material-comprising component; wherein the relatively inelastic material-comprising component has either: (a) a modulus of elasticity that is greater than the modulus of elasticity of the shape changing material-comprising component, or (b) a stiffness that is greater than the stiffness of the shape changing material-comprising component. (a) a modulus of elasticity that is greater than the modulus of elasticity of the shape changing material-comprising component, or (b) a stiffness that is greater than the stiffness of the shape changing material-comprising component.