| 摘要 |
A mechanical valve used to stop unwanted discharge of liquids less dense than water, principally oil, which may be present in waste water flows. The valve is closed by sinking of a float less dense than water but more dense than the liquid whose discharge is to be stopped. The float is surrounded by a housing. Variations in the location of holes in the housing determine the depth of liquid which is required before the valve will close. Simple glass or other containers may be converted to serve as grease traps by installing the valve which has its discharge outlet above the valve orifice.
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