| 摘要 |
This invention comprises a valve filter unit (23, 53) comprising a filter (24, 54) the face (25, 55) of which extends angularly to the flow of a fluid medium toward same, and having perforations (26) formed therein; the filter (24, 54) biased by a spring (33, 63) toward a first position wherein the fluid is forced to flow through the filter (24, 54) to remove foreign particles therefrom; said filter (24, 54) movable against the spring (33, 63) in response to additional pressure of the fluid to unseat the filter (24, 54) from its first position engagement with a surface (40, 66) of the conduit (12, 51) within which the filter (24, 54) is mounted, the additional pressure occurring due to a valve (21) downstream from the filter (24, 54) moving away from a closed position with its seat (22) such that the fluid moves quickly past the filter (24, 54) and through the space formed between the filter (24, 54) and the surface (40, 66), thereby cleansing both the filter surface (25, 55) and the mating surfaces of the valve (21) and valve seat (22).
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