| 摘要 |
<p>A socket (A) includes a first flow passage (4) which is provided with a first closure member (14) and a first check member (32). And a plug (B) includes a second flow passage (54) which is provided with a second closure ember (64) and a second check member (82). The second check member (82) comprises a larger-diameter member (86) and a smaller-diameter member (88). A first cylindrical filter (20) is arranged on an outer periphery of the first closure member (14). A second cylindrical filter (37) is arranged on an outer periphery of the first check member (32). A third cylindrical filter (70) is arranged on an outer periphery of the second closure member (64). Each of the cylindrical filters (20), (37) and (70) comprises an inner perforated sheet (41), a screen (42) and an outer perforated sheet (43) arranged in the mentioned order from an interior area. <IMAGE></p> |
