Extended coverage ceiling sprinklers and systems

摘要

Ceiling sprinklers and sprinkler systems provide extended areas of ordinary and light hazard coverage through a combination of orifices with K factors greater than 9 and deflectors which extend water distributions radially with acceptable uniform average and absolute distribution densities all around and beneath the sprinklers. Described deflectors for concealed sprinklers are circular with slots extending axially and radially through inwardly towards the center of the deflector from the circular perimeter. Such deflectors include a central curved protrusion extending back towards the outlet to spread the water column over the deflecting structure and a surrounding planar annular area of the structure. The deflectors are supported on pins to telescope away from the sprinkler body and drop below or farther below the lower surface of the ceiling in which they are installed. Sprinkler systems of the present invention can be installed with closest adjoining pairs of sprinklers and branch lines spaced more than fifteen feet apart and up to twenty-feet apart when the sprinklers are located within at least seven and one-half feet and as close as only three feet or less above the protected area.