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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

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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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

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. esource record. During the refresh interval, an authorized DNS server may refresh, but not scavenge the associated resource record. During the scavengable period, the resource record may be scavenged, if the timestamp is not renewed in the meantime. The build up of stale resource records, or records that have outlived their utility, is thus prevented improving system performance and conserving system memory and resources.