Back seating valve with service port
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United States of America Patent
Stats
-
Dec 21, 2004
Grant Date -
Jan 30, 2003
app pub date -
Jul 17, 2002
filing date -
Jul 25, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A back seating valve includes a valve body enclosing a valve plug with a threaded through-bore; and a valve element with a threaded valve stem and valve head. The valve plug and valve stem are initially preassembled, and then inserted into the valve body. The valve body is mechanically formed to retain the valve plug in the valve body without the use of welding or brazing. The valve plug has an external, non-cylindrical geometry which prevents the valve plug from rotating within the valve body. The valve plug is axially held between a shoulder and a narrowed-down end in the valve body. An external portion of the valve stem can be rotated to move the valve head into open, intermediate and closed positions between a front valve seat in the valve body, and a back valve seat in the valve plug.
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