Abstract: A fire sprinkler including: a body connected to a water supply and having a passage, the passage having a sealing material or a sealing surface at a first end; an actuator disposed in the passage, the actuator and passage configuring a water-tight seal; a water spreader configured to direct water radially outward; and a wax motor actuated by an ambient temperature greater than a predetermined threshold temperature such that actuation of the wax motor exerts an actuation force on the second end of the actuator to move the actuator to a seal between the water supply and the water spreader; wherein the actuator is arranged such that the pressure from the water supply tends to move the actuator to stop water flow when the ambient temperature falls below the predetermined threshold temperature.

Abstract: A fire sprinkler including: a body connected to a water supply and having a passage, the passage having a sealing material or a sealing surface at a first end; an actuator disposed in the passage, the actuator and passage configuring a water-tight seal; a water spreader configured to direct water radially outward; and a wax motor actuated by an ambient temperature greater than a predetermined threshold temperature such that actuation of the wax motor exerts an actuation force on the second end of the actuator to move the actuator to a seal between the water supply and the water spreader; wherein the actuator is arranged such that the pressure from the water supply tends to move the actuator to stop water flow when the ambient temperature falls below the predetermined threshold temperature.