Waterless trap
A waterless trap for use in a drain assembly includes flow enhancing features to promote the vortex water flow of water received in the trap, an improved sealing arrangement to enhance the seal between a seal member and the housing to inhibit sewer gas leaks from an attached drain pipe by maintaining an evaporation barrier that assists in retaining water in a corresponding p-trap, and a plurality of air passages can allow the trap seal to open with ease when the drain pipe is pressurized. These features may be used in combination with one another or may be independently employed.
1. A waterless trap comprising:
a housing having an outer peripheral wall, the outer peripheral wall having a radially inward facing wall, the housing further having a central post and a plurality of blades extending from the outer peripheral wall to the central post in which the plurality of blades are integrally formed with the central post and the outer peripheral wall;
a seal member having a stem received on the central post of the housing and a skirt extending radially outward and downwardly from the stem in which the skirt contacts the radially inward facing wall of the housing to form a seal therebetween; and
a cap configured to receive a portion of the central post, the cap being a separate component from the housing;
wherein the central post has a central air passage defined by an aperture extending through the central post from a top surface of the central post to a lower extent of the central post and wherein the cap is positioned to inhibit liquid flow from a volume of the housing above the seal member to a volume of the housing below the seal member.
2. The waterless trap of claim 1 , wherein the central post comprises one or more escape ports extending radially outward from the central air passage and positioned in fluid communication with the central air passage.
3. The waterless trap of claim 2 , wherein the top surface of the central post has the one or more escape ports and the cap sits on the top surface of the central post.
4. The waterless trap of claim 1 , wherein the cap is further configured to sit at the top surface of the central post.
5. The waterless trap of claim 1 , wherein the cap includes slots which are sized to accommodate each of the plurality of blades.
6. The waterless trap of claim 1 , wherein the cap is positioned to cover a portion of the central air passage.