US 6,719,004 B2 · Check valve floor drain

Abstract

A method and 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 method and apparatus typically are for use draining floors, basements, roofs, countertops, exterior paved areas, and surfaces draining into line that could discharge waste gas back into the environment. The invention provides floor drain assemblies and check valves with good drainage performance with out the use of P or U-traps, and is particularly well suited for use when drainage occurs irregularly. Floor drains according to the invention comprise check valves adapted for disposition within floor drains, the check valves generally comprising spring-loaded stops, elastic diaphragms, or sheath valves. Check valves according to the invention are preferably installable in existing drain structures, and are easily removable.

Claims13

Dependent claims

A check valve floor drain assembly for draining liquid from a draining surface into a drain conduit, the floor drain assembly comprising:

a drain basin having a drain inlet for liquid draining from the draining surface and an outlet for attachment to the drain conduit;
and
a check valve disposed within said drain basin, said check valve adapted to permit substantially unrestricted flow of liquid from the drain inlet to the drain conduit, and to prevent backflow of gasses located within said drain conduit to said drain inlet;
the check valve being constructed entirely from a substantially flexible elastomeric material with memory properties that allow said check valve to open for fluid passage and then return to its original shape;
whereby the check valve allows liquid to drain from the draining surface and achieves a seal to prevent backflow of gases from the drain conduit after liquid has drained.

2 more elements

Dependencies are inferred from the claim text.

Check valve floor drain

Life of this patent

Check valve floor drain

Life of this patent

Abstract

Claims13