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A high energy loss fluid flow control device suitable for use with high temperature, abrasive coal liquids, gases and the like comprises an elongated body having an axially extending bore with longitudinally spaced apart inlet and outlet passages in communication with the bore. An elongated valve me

A high energy loss fluid flow control device suitable for use with high temperature, abrasive coal liquids, gases and the like comprises an elongated body having an axially extending bore with longitudinally spaced apart inlet and outlet passages in communication with the bore. An elongated valve member is mounted for sliding axial movement within the bore between open and closed positions. The valve member includes an outer surface spiralling about a longitudinal axis from a maximum diameter portion adjacent one passage toward a minimum diameter portion adjacent the other passage. The bore of the elongated body includes a surface in close facing relation with the spiralling surface of the valve member and this surface also is spiralled about a longitudinal axis from a minimum diameter portion towards a maximum diameter portion. The cooperative spiralling surfaces of the bore and valve member define a spiral fluid flow path extending between the inlet and outlet passages having a generally polygonal, transverse cross-section which may be of constant or continuously increasing cross-sectional area between the inlet and outlet passages. Means is provided for moving the valve member longitudinally in the bore between open and closed positions. The flow control device has a unique step-tapered design providing for minimal clearance flow and fewer crevices or dead space wherein solid materials (commonly found in coal liquids and gases) can collect and interfere with operation.

대표청구항 ▼

A high energy loss fluid flow control device comprising: an elongated body having an axially extending bore with longitudinally spaced apart inlet and outlet passages in communication with said bore; an elongated valve member mounted for axial movement in said bore between closed and open, longitudi

A high energy loss fluid flow control device comprising: an elongated body having an axially extending bore with longitudinally spaced apart inlet and outlet passages in communication with said bore; an elongated valve member mounted for axial movement in said bore between closed and open, longitudinally spaced apart position; said valve member including an outer surface spiralling about a longitudinal central axis of said member from a minimum diameter portion adjacent one of said passages toward a maximum diameter portion adjacent the other of said passages; said bore having a surface in close facing relation with said spiralling surface of said valve member and spiralling about said longitudinal axis from a minimum diameter portion adjacent said one passage toward a maximum diameter portion adjacent said other passage; said spiralling surfaces of said bore and valve member defining a spiral fluid flow path extending between said inlet passage and said outlet passage having a generally polygonal cross-section transverse cross-sectional area as viewed on a plane extending radially outward of said longitudinal axis, said cross-sectional area having a radial dimension substantially smaller than its dimension normal thereto extending longitudinally of said axis, said spiralling surface of said maximum diameter portion of said valve member gradually transitioning into a cylindrical surface of said member extending oppositely away from said minimum diameter portion in an axial direction, said spiralling surface at said maximum diameter portion of said bore of said valve body transitioning gradually into a cylindrical surface extending oppositely away from said minimum diameter portion in an axial direction; and means for moving said valve member longitudinally in said bore between said open and closed positions.