Fluid flow control device
First Claim
1. 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.
1 Assignment
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Accused Products
Abstract
A fluid flow control device (10) has a stack of annular discs (15) defining a central passageway (14) and a plug (16) reciprocable in the passageway for controlling fluid flow. Adjacent discs (15) in the stack have at least one fluid passageway (21A) formed in a major face (22A) of one disc closed by the abutting major face of the adjacent disc. The fluid passageway (21A) extends in a clockwise direction and has a linear inlet portion (23A) and a curved outlet portion (24A). The inlet portion (23A) is of constant cross-sectional area and the outlet portion (24A) is of increasing cross-sectional are in the direction of fluid flow. Other configurations of discs and/or fluid passageways are disclosed.
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Citations
12 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
tungsten carbide; and
ceramic material.
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12. The flow control device of claim 1 wherein the control member comprises a plug reciprocally movable within the central passageway from a fully closed position through a range of partially open positions to a fully open position, from a fully open position through a range of partially open positions to a fully closed position, under the control of an actuator.
Specification