Balanced globe valve
AssigneeInvensys Building Systems, Inc.
InventorsIrving C. Erickson, Hongming Ge, Bonnie Dickinson
Life of this patent
Estimating the term…
Abstract
An essentially fully balanced plug valve is presented in which the flow control contour is interior to the moving member. The sealing edge of the moving member is at the exterior surface relative to the interior contour. This sealing edge is formed by use of matching angles on the interior of the moving member and the exterior of the stationary member. As a result, operation of the plug is fully balanced with the internal fluid pressure of the liquid therein. The sealing surface of the stationary member is positively retained therein to prevent blowout of the sealing surface. Should failure of the sealing surface occur, a secondary metal-to-metal seal will provide fluid containment albeit possibly at a reduced containment level.
Claims14
A balanced plug valve, comprising:
- a valve body defining flow passage between an inlet and an outlet thereof;
- a valve seat;
- a balanced plug linearly movable relative to the valve seat for regulating a flow of fluid through the flow passage, the balanced plug having a first end exposed to fluid pressure from the inlet and a sealing end configured to expose a pressure balancing surface to the fluid pressure from the inlet when in sealing engagement with the valve seat;
- wherein the sealing end of the balanced plug comprises a sealing contact point at an outer most edge of a perimeter wall thereof, and wherein the pressure balancing surface is defined between the sealing contact point and an inner most edge of the perimeter wall;
- and
- wherein the sealing end of the balanced plug further comprises a shoulder land surface.
A balanced globe valve, comprising:
- a valve body defining a flow passage between at least a first inlet and an outlet thereof;
- at least one valve seat fixably positioned within the valve body;
- a balanced plug linearly movable within the valve body relative to the at least one valve seat for regulating a flow of fluid between at least the first inlet and the outlet, the balanced plug having a generally cylindrical perimeter wall terminating in a first end and a second end, each of the first end and the second end configured to expose a surface thereof to fluid pressure from the same one of the at least one inlet and the outlet such that the fluid pressure on the perimeter wall in a direction tending to impede linear movement of the balanced plug is balanced by fluid pressure on the perimeter wall in a direction tending to aid linear movement of the balanced plug;
- wherein at least one of the first end and the second end comprises a sealing contact point at an outer most edge of the perimeter wall, and wherein the surface is defined between the sealing contact point and an inner most edge of the perimeter wall;
- wherein at least one of the first end and the second end further comprises a shoulder defined between the sealing contact point and the surface;
- and
- wherein at least one valve seat further defines a secondary sealing surface operable in relation to the shoulder to provide a sealing engagement therewith.
Dependencies are inferred from the claim text.