| 摘要 |
An improved floor drain for buildings, basements, exterior paved areas, and the like. The invention provides floor drain assemblies and floor drains providing improved drainage performance, particularly where drainage is an irregular occurrence, and having unprecedented simplicity and reliability. Floor drains according to the invention comprise side port drain valves adapted for disposition within floor drains, the drain valves generally comprising non-horizontal drain ports, one or more sealing surfaces disposed between the ports and a drain conduit, a stop adapted for sealing engagement of the sealing surface, and means to urge the stop into sealing engagement of the sealing surface. Floating, spring-loaded, or flexible elastic valves stops, among others, may be used; any of them may be tailored for opening under a selected hydrostatic pressure. Use of side port drains according to the invention permits drainage through the drain conduit while preventing back flow from the drain of undesirable or unwanted gasses. Drain assemblies according to the invention are preferably installable in existing drain structures, and easily removable for maintenance or replacement.
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