Patent ID: 8596292
Filing Date: 2013-12-03
Classification: F04B,Y10T

Abstract:
1. A controlled flow drain, comprising: an upper flange coupled to a lower flange, the upper flange defining an inlet fluidly coupled to an upper drain pipe, and the lower flange defining an exit fluidly coupled to a lower drain pipe; a director orifice fluidly coupled to the inlet of the upper flange and in fluid communication with an inlet cavity defined within the upper flange; a swirl nozzle plate disposed within the upper flange and configured to receive a drain flow via the inlet and director orifice and accommodate accumulation of debris thereon; a debris fence coupled to the swirl nozzle plate within the upper flange; a swirl nozzle defined within the swirl nozzle plate and at least partially surrounded by the debris fence, the swirl nozzle providing fluid communication between the inlet cavity and a swirl chamber; an annular groove fluidly communicable with the swirl chamber and defined within the lower flange, the annular groove having a series of flushing liquid injection ports symmetrically-arrayed thereabout; and an exit control passage defined within a drain restrictor and in fluid communication with the exit and the lower drain pipe.