| 摘要 |
A flow valve operating by pressure differentials and by flow transfer means which regulate small flows of control. This valve is sensitive to small changes of pressure and resistant to great working pressures, having few components of a simple design. The valve of the invention basically consists in a rigid valve body with an opening for flow inlet and one opening for flow outlet, which are oriented in a substantially cross way to said flow opening. The body of the valve has a main cavity between the flow inlet and the flow outlet. A valve seat is in the limit of the main cavity and the flow inlet. In addition, the valve body has pipes for the inlet of the control flow and for the outlet of the control flow, which are associated with the flow transfer means for the control of the valve. The valve also has an elastomeric body in charge of regulating the flow of it, by opening or closing it, depending on the difference of pressures produced between the walls, which are modified by the flow transfer means for the control flow. The elastomeric body is located inside the main cavity of the valve, the same being hollow and open in one of its axial ends and has a central hole in the other end. This elastomeric body is at least made up of two coaxial zones: one sealing zone and a second zone of radial seal. Eventually, a third intermediate zone or a zone of thin wall. These zones of the elastomeric body meet specific functions during the operation of the valve, thus avoiding the participation of the separate components which make the design complex and increase the manufacture cost.
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