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Balanced globe valve

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.  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.

                                                                                                      Shanghai Remy Valve Manufacturing Co., Ltd

2012-01-18 03:39

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