Abstract: In the particular embodiments of the quick response sprinkler described in the specification, a sprinkler housing is sealed with a valve plug supported on a deflector which is movable between a closed position and an open position. A thermally responsive element supported from a first lever which engages the valve plug has a plunger supporting a second lever and a third lever maintains the spacing between the first and second levers. When the thermally responsive element is actuated by elevated temperature, the plunger moves away from the levers, permitting the levers to separate and releasing the entire valve-retaining mechanism from the sprinkler housing.

Abstract: In the representative embodiment described in the specification, a decorative quick-response sprinkler has a hollow body normally sealed at its outer end by a valve which is retained in position by a valve-retaining assembly. The valve-retaining assembly has locking balls which are held in engagement with a groove in the sprinkler body by a bevelled locking disc with a push rod engaging a eutectic material in a tubular temperature-sensing element.

Abstract: In the representative embodiment of the invention described herein, an adjustable sprinkler for a fire protection system has a sprinkler assembly tube which is mounted for longitudinal movement in a bore extending longitudinally into a component of a fluid supply piping network for the fire protection system. A latching device is resiliently urged into the bore of the component to prevent accidental removal of the sprinkler assembly tube during its longitudinal movement in the bore by releasably engaging the sprinkler assembly tube before it is completely removed from the bore. When the sprinkler assembly tube is disengaged by the latching device, the sprinkler assembly tube can be removed from the bore.