| 摘要 |
A cage valve for reduced erosion at the outlet bore. The valve is of the type having flow trim arranged transverse to the inlet bore and aligned with the outlet bore, the flow trim including a stationary tubular cage and an external cylindrical flow collar slidable along the side wall of the cage to cover or uncover one or more pairs of main flow ports in the cage side wall. The external flow collar is located for movement between a fully closed position wherein each of the main flow ports is fully covered by the external flow collar and a fully open position wherein each of the main flow ports remains partially covered by the external flow collar such that fluid flow from the inlet through each of the main flow ports is directed angularly into the external flow collar, away from the outlet bore, to reduce erosion at the outlet bore.
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