Shut-off device in the form of a ball valve
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United States of America Patent
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-
Jun 7, 1988
Grant Date -
N/A
app pub date -
Mar 23, 1987
filing date -
Jul 23, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The ball valve comprises a body (1) provided with two coaxial pipe stubs (4, 5) wherein a ball means (2) rotatable by means of a rotating shaft device floats. In the closed position, the downstream face of the spherical circumference (12) of said ball means mates with a complementary sphere-bent annular body sealing surface (11), a pressure difference building up between the upstream and the downstream sides of said ball means. Said ball means and said sealing surface form a primary sealing system (11, 12) concentric with the pipe stub axis (10). The sealing function of said primary sealing system is reliably achieved by means of a block and bleed system, the annular body sealing surface (11) being split by an annular groove (13) in the wall of said body concentric with said pipe stub axis (10) connected with the control line (14) of a bleed system (14, 15) penetrating said body wall. Two concentric elastic sealing rings (17) spaced relative to each other are placed on the two sides of said annular groove (13) interfacing with said annular body sealing surface (11), closing a gap between said ball means (2) and said sealing surface (11) until said primary sealing system (11, 12) is effective.
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