Side port floor drain

A method for admitting liquid from a draining surface into a drain conduit, and for preventing discharge of waste gas from the drain conduit into the atmosphere in response to a higher pressure in the drain conduit than at the draining surface, the method comprising the steps of:

• providing a housing;
• disposing the housing in the flow path between liquid being drained and the drain conduit;
• providing at least one drain port in the housing;
• providing each said drain port with a non-horizonital drain scaling surface;
• disposing a stop between the non-horizontal drain sealing surface and the drain conduit, the stop adapted for sealing engagement of the drain sealing surface;
• and
• providing a means to urge the stop into sealing engagement with the drain sealing surface, the means adapted to permit disengagement of the stop from the sealing surface as liquid enters the floor drain,
• whereby drainage of liquid through the drain port is permitted, and backflow of gasses from the drain conduit after liquid has drained is prevented.

A side port floor drain apparatus for admitting liquid from a draining surface into a drain conduit and for preventing discharge of waste gas from the drain conduit into the atmosphere in response to a higher pressure in the drain conduit than at the draining surface, the floor drain apparatus comprising:

• a housing having circumferential walls with an exterior surface and an interior surface, an open bore extending throughout, a first section, a second inwardly tapered midsection, a third section designed for connection with the drain conduit, and a cover joined over the first section, forming a chamber adapted for connection with the drain conduit;
• a drain port through the walls of the housing having a non-horizontal drain sealing surface on the interior surface, the drain port creating a path for liquid from the exterior surface into the drain conduit;
• and
• a stop disposed on the interior surface, located between the non-horizontal drain sealing surface and the drain conduit, configured to scalingly engage the drain sealing surface and movably operate within the chamber, and further configured to admit liquid proximate to the exterior surface into the chamber and into the drain conduit and to prevent discharge of waste gas from the drain conduit into the atmosphere in response to a higher pressure in the drain conduit than at the draining surface.

A side port floor drain for draining liquid from a draining surface into a drain conduit, the floor drain comprising:

• a drain port having a non-horizontal drain sealing surface;
• a stop disposed between said non-horizontal drain sealing surface and said drain conduit, and adapted for sealing engagement of said drain sealing surface;
• and
• a means to urge the stop into sealing engagement with said drain sealing surface, and adapted to permit disengagement of the stop from the sealing surface as liquid enters said floor drain, whereby drainage of liquid through said drain port is permitted, and backflow of gasses from said drain conduit is prevented after liquid has drained.