Fluid handling – Destructible or deformable element controlled – Destructible element
Patent
1997-01-02
1998-07-28
Walton, George L.
Fluid handling
Destructible or deformable element controlled
Destructible element
137312, 13762522, 137385, 251214, 25131514, F16K 506, F16K 1102, F16K 4100
Patent
active
057850747
ABSTRACT:
The present invention relates to a ball valve with a shear stem which can be utilized in combination with a conventional ball valve or vented ball valve.
The ball valve with a shear stem is utilized with a conventional ball valve or a vented valve assembly including a valve body having a vent hole therein. The ball valve defines a body having first and second flow-through ends with a valve member receiving chamber thereinbetween, and a collar defining a stem receiving passage communicating with the chamber. A valve member such as a ball or cylindrical plug is disposed within the chamber. The valve member has a throughbore therein in operable alignment with the first end second flow-through ends. The vented ball valve embodiment has at least one valve member vent hole through the wall of the valve member in flow communication with the throughbore. A shear stem extends through and is rotatably mounted within the stem receiving passage and engageable with the valve member for rotating the valve member in and out of flow-through alignment. The vented valve embodiment includes a venting means in cooperation with the shear stem providing selected flow communication with the atmosphere through the valve body vent hole, between the shear stem and stem receiving passage, through the chamber, and through said valve body vent hole to the flow-through ends.
The shear stem includes a first lower continuous primary groove circumventing the stem for cooperative engagement with a primary O-ring providing a seal between the stem and the collar and a second higher continuous secondary groove circumventing the stem for cooperative engagement with a secondary O-ring. The continuous secondary groove is deeper, thicker, or shaped in a particular configuration in order to shear before the continuous primary groove in order to provide a safety means for preventing gas or liquid leakage due to shearing of the stem. In the vented ball valve embodiment the O-ring groove having an axial offset portion also serves to function as the primary groove to be used in combination with a circumferential secondary groove having a secondary O-ring. The conventional ball valve embodiment utilizes a pair of spaced apart circumferential grooves providing for a primary and secondary groove and O-ring arrangement.
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Nibco Inc.
Walton George L.
LandOfFree
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