Ball valve
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United States of America Patent
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Jan 26, 1993
Grant Date -
N/A
app pub date -
Aug 19, 1991
filing date -
Dec 19, 1989
priority date (Note) -
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status (Latency Note)
Importance
Abstract
In a ball valve wherein the rotation of a ball (1) provided in a valve chest (8) opens and closes a valve, an orifice (4) is provided in a passage (3) of the ball, and communicating passages (5) connecting the upstream side of the orifice (4) with the valve chest (8) and communicating passages (6) connecting the downstream side of the orifice with the valve chest (8) are provided. The passage (3) provided in the ball (1) has a large aperture at one end (30) and a small aperture at the other end (31), the respective communicating passages (5) (6) are formed so as to communicate the passage (3) with the valve chest (8) when the valve is opened, and the aperture of the passage (32) whereat a seat carrier (11) of the small aperture side of the ball faces the ball is made substantially the same as the aperture of the small aperture side end (31) of the passage of the ball (1).
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