Control valve
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United States of America Patent
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-
May 17, 1994
Grant Date -
N/A
app pub date -
Dec 30, 1992
filing date -
May 20, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a control valve with an improved closing function that functions over a long period of time and the flow rate control can be carried out over a wide range. A valve body (1) is provided inside thereof with a partition (4) separating an inlet passage (2) and an outlet passage (3). The partition (4) is provided with an opening portion (5) communicating the inlet passage (2) and the outlet passage (3). A shutoff valve (10) is disposed opposite the opening portion (5). The diameter of the opening portion (5) is increased and curves toward the side of the shutoff valve (10). A control plug (12) is arranged on and projected from the lower end of the shutoff valve (10); said control plug being located on the large diameter side of the opening portion (5), is coaxial with the opening portion (5), and has a flange portion (12a) defining an orifice (14) between the inner surface of the opening portion (5) and the flange portion. The shutoff valve is movable up and down and allows the lower end (11) thereof to abut against a valve seat portion (15) formed on the periphery of the opening portion (5).
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