High performance fluid control valve
First Claim
1. A fluid control valve comprising:
- a valve body having a fluid passageway;
a cage mounted in said fluid passageway, said cage including a generally cylindrical wall, a cage bore having an axis, said cage defining one or more windows, a valve seat located below said one or more windows and a flow control portion of the cage bore located between said valve seat and said windows, the flow control portion having an interior contour that varies in dimension as a function of distance from said valve seat; and
a valve plug assembly including a valve plug that is axially slidable in the cage bore and is guided by said cage between a closed position in engagement with said valve seat, a partially open position wherein fluid flow is determined by a spacing between said valve plug and the flow control portion of the cage bore, and a more open position wherein fluid flow is determined by said windows and by said spacing, wherein said valve plug comprises a cylindrical section that defines a spacing between said valve plug and the flow control portion of the cage bore, and an annular expansion groove above said cylindrical section configured to facilitate low pressure recovery for reduced noise in low flow applications.
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Accused Products
Abstract
A fluid control valve includes a valve body having a fluid passageway, a cage mounted in the fluid passageway and a valve plug assembly including a valve plug. The cage has a cage bore and defines one or more windows, a valve seat located below the windows and a flow control portion of the cage bore located between the valve seat and the windows. The flow control portion has an interior contour that varies in dimension as a function of distance from the valve seat. The flow control portion provides precise control in low flow conditions. The cage may further define a sealing lip located above the windows. The valve plug assembly may include a deformable sealing ring for engaging the sealing lip when the valve plug is in a closed position. The deformable sealing ring permits valve plug travel that is substantially free of sliding seal friction.
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Citations
13 Claims
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1. A fluid control valve comprising:
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a valve body having a fluid passageway;
a cage mounted in said fluid passageway, said cage including a generally cylindrical wall, a cage bore having an axis, said cage defining one or more windows, a valve seat located below said one or more windows and a flow control portion of the cage bore located between said valve seat and said windows, the flow control portion having an interior contour that varies in dimension as a function of distance from said valve seat; and
a valve plug assembly including a valve plug that is axially slidable in the cage bore and is guided by said cage between a closed position in engagement with said valve seat, a partially open position wherein fluid flow is determined by a spacing between said valve plug and the flow control portion of the cage bore, and a more open position wherein fluid flow is determined by said windows and by said spacing, wherein said valve plug comprises a cylindrical section that defines a spacing between said valve plug and the flow control portion of the cage bore, and an annular expansion groove above said cylindrical section configured to facilitate low pressure recovery for reduced noise in low flow applications. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification