Patent ID: 8371333
Filing Date: 2013-02-12
Classification: F16K,Y10T

Abstract:
1. A valve having a fluid flow path extending therethrough which is to be restricted or closed, comprising: a hollow valve body assembly having an inlet bore and an outlet bore substantially at right angles and a main bore which is an extension of the outlet bore and which communicates with the inlet bore; a flow trim positioned in the main bore, the flow trim comprising a stationary, open-ended tubular cage and an external cylindrical flow collar slidable along the outer side wall of the cage, the external flow collar forming a bore and being closed at an upstream end to form a flow collar chamber in the bore of the external flow collar, the cage side wall forming an internal bore aligned with the outlet bore and at least a pair of diametrically opposed main flow ports, whereby fluid enters the valve through the inlet bore, passes through the main flow ports at reduced pressure and continues through the outlet bore; a bonnet disengagably connected with, and closing, an upper end of the valve body; a stem for biasing the external flow collar over the main flow ports; and the external flow collar being located within the main bore for limited 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 with between about 5% and 15% of the diameter of each of the main flow ports at an upper part of the main flow ports remaining covered in the fully open position, such that fluid flow from the inlet bore through each of the main flow ports is directed angularly into the flow collar chamber of the external flow collar away from the outlet bore to reduce erosion at the outlet bore without reducing the flow capacity of the valve in the fully open position.