Patent ID: 6782920
Filing Date: 2004-08-31
Classification: F16K,Y10T

Abstract:
In a fluid flow control device incorporating a stack of annular discs, each disc having an inner perimeter and an outer perimeter, the inner perimeter of each disc defining a central aperture such that the annular discs form a central passageway extending longitudinally through the stack, adjacent discs having abutting major faces defining at least one fluid passageway extending between the inner and outer perimeters of the discs, and a control member reciprocally movable within the central passageway to control fluid flow through the device, the improvement comprising:the at least one fluid passageway comprising a groove in at least one of the abutting major faces of adjacent discs, the groove having an inlet commencing at one of the inner and outer perimeters and an outlet at the other of the inner and outer perimeters, the inlet opening to a linear portion of the groove, the linear portion leading to a curved portion of the groove, and the curved portion terminating at the outlet.