| 摘要 |
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.
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