| 摘要 |
PROBLEM TO BE SOLVED: To prevent or suppress the collision of a distal end of a cleaning brush against a valve casing when a duct of a fluid for cleaning is cleaned by the brush. SOLUTION: First to fourth ports 41 to 44 to be connected to a liquid supply duct 13, a gas supply duct 14, a liquid sending duct 15 and a gas sending duct 16 are respectively formed at the valve casing 40 provided in a body operating section 2. The first and second ports 41 and 42 connected with the ducts 13 and 14 connected in a direction perpendicularly crossing an axis of the casing 40 having a large inner diameter have substantially the same diameters as the ducts 13 and 14 at the diameters of the casing 40 at its outer surface side in contracted structures which are continuously radially contracted toward an interior side. Sites of the smallest channel cross-sectional areas of the ports 41 and 42 have substantially the same diameters as or slightly larger diameters than the inner diameters of the ducts 14 and 16. COPYRIGHT: (C)2004,JPO
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