| 摘要 |
A sprinkler head including an adjustable valve with a valve opening and a movable valve means. The valve means includes a gate means movable into and out of the valve opening. The gate means and valve opening form a valve port to control fluid flow at relatively low fluid flow rates. The valve port includes a port perimeter and cross sectional port area in a plane lying generally perpendicular to the flow of fluid. The valve port is varied in size while maintaining a continuous port perimeter with a generally wide cross sectional port area.
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