| 摘要 |
A balanced valve for flows operated by the axial driving of a stem which commands a sealing body liable to axially slip between an opened position far from the valve seat and a closed seal in contact with the valve s eat. The valve basically consists in a valve body having an inlet opening for the flow with a valve seat at the bottom. The valve body also has an opening for the flow outlet oriented in a substantially cross-section way to the flow inlet. Between the inlet and outlet of flow there is a cylindrical cavity with a ring-shaped broadening in the zone communicating with the flow outlet above the valve seat. There is an elastomeric sealing body located inside the cylindrical cavity, which is mainly made up of a relatively solid sealing end, with a slightly greater height than the height of the ring-shaped broadening of the cylindrical activity. This sealing end is provided with one or more axial passes or holes, an d its also has a coaxial zone of radial seal located in the section of upper base of said sealing end, which consists of a circular groove in "V" section at the lower face of the sealing end near its periphery defining a perimetric lug. A variant of the valve considers a cylindrical elastomeric wall topping out the sealing end, which consists of an upper extension of the same sealing end, and topping in its other end in a radial edge withheld in the valve body. This elastomeric cylindrical wall may have one or more reinforcing rings conformed in its mantle and axially arranged.
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