Patent ID: 7434747

Claim:
A sprinkler comprising: an inlet and an outlet for fluid communication with a pressurized water source; a body interconnecting the inlet and the outlet, and the body defining at least in part a main fluid channel in fluid communication with the inlet and the outlet; a turbine disposed between the inlet and the outlet and being configured so that contact between the turbine and fluid flow causes rotation of the turbine; a drive mechanism for rotating the outlet; a drive housing being located in the body for covering a portion of the drive mechanism, the drive housing defining at least in part the main fluid channel; and a flap positioned in the main fluid channel along at least a portion of the drive housing, the flap having an open position permitting fluid flow from the inlet to the outlet and being directly moved to the open position by the fluid flow, and a closed position wherein the flap traverses across the main channel from the drive housing to the body to restrict particulate entering the outlet from encountering the turbine when the pressurized fluid flow is shut off to the sprinkler, and the flap being naturally biased to move to the closed position when the fluid flow is shut off to the sprinkler.