Drain line access device

摘要

A drain line access device is provided for flushing HVACR drain lines. The device includes a main body having input and outlet connection ports on opposite ends for inline installation to a drain line, a flapper assembly sized and configured for seated placement in an interior cavity of the main body, and a removable top cover. The flapper assembly includes a flapper holder, a flapper, a flapper seat, and a spring hinge for rotatably urging the flapper into the normally raised position. An injection port is provided on the top cover for delivering a flow of pressurized gas or liquid for flushing out a clog in the drain line. In operation, delivery of pressurized gas or fluid into the drain line forces the flapper against the flapper seat, thereby sealing off one of the respective ends of the main body and directing the pressurized gas into the drain line.

主权项

1. An access device for inline installation on a drain line between a condensation producing source and a drain discharge, and said device comprising:
a main body having an inner wall surface extending to an inner bottom surface and surrounding an interior cavity, and said main body including an input connecting port sized and configured for sealed connection with the drain line and an outlet connecting port sized and configured for sealed connection with an opposite facing end of the drain line, and a flow passage extending through said interior cavity between said input and outlet connecting ports and the flow passage being at least as large as a cross-sectional dimension of an interior flow passage of the drain line; an injection port being structured and disposed for receiving a flow of pressurized gas or liquid and delivering the flow of pressurized gas or liquid into the interior cavity; a removable flapper valve assembly comprising a flapper and a flapper holder having a flapper seat in the interior cavity of said main body, said flapper being in a normally raised position adjacent to said injection port and removed from a flow of drain line contents through the flow passage, and said flapper being structured and disposed for being forced downwards and away from said injection port and to a closed position when the flow of pressurized gas or liquid enters the interior cavity through said injection port for sealing the input connection port closed and blocking flow of the drain line contents from the input connecting port into the flow passage and directing the flow of pressurized gas or liquid through the opposing outlet connecting port and into the drain line; and a sealing pad on said flapper and being sized and configured for sealing the underside of said injection port when said flapper is in the normally raised position.