| 摘要 |
PROBLEM TO BE SOLVED: To reduce the decrease in a drain amount flowing down an orifice when a float starts to open a valve port. SOLUTION: A valve chamber 4, inlet 5, and an outlet 6 are formed out of a valve casing consisting of a main unit 1 and a cover member 2. A valve port 9 connecting the valve chamber 4 to a side of the outlet 6 and a valve seat member 8 opening a plurality of orifices 10 are mounted in a lower side wall of the main unit 1. A plurality of the orifices 10 are formed respectively with an equal space on a circumference with a center axis of the valve port 9 serving as the center. An opening area of a plurality of the orifices 10 is respectively equally formed, a total opening area is formed in size which can not completely discharge out a drain generated at air feed time of a piping system. A hollow spherical float 14 opening/closing the valve port 9 is received in a free condition in the valve chamber 4. When the float 14 starts the valve port 9 opened, the float 14, by obstructing not a flow of drain flowing down the orifice positioned under the valve port 9 but a flow of drain flowing down the orifice positioned in an upper side of the valve port 9, can reduce decreasing of a drain amount flowing down the orifice 10.
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