Pipes and tubular conduits – With flow regulators and/or baffles – Restrictors
Patent
1979-11-19
1981-07-21
Bryant, III, James E.
Pipes and tubular conduits
With flow regulators and/or baffles
Restrictors
138 43, 13762528, 1376253, F15D 102
Patent
active
042792746
ABSTRACT:
A fluid flow control device, particularly for use in connection with valves used in the control of fluids under high pressure, is disclosed. In the new structure, the valve trim includes a form of flow restrictor, which serves to limit flow velocity and which causes the fluid pressure to be reduced in a sufficient number of discrete stages to minimize noise and cavitation. The new flow restrictor comprises an axial stack of annular discs, each provided with a plurality of annular baffle ribs projecting from its opposite end faces. The annular baffle ribs on one side of the disc are slotted along a number of equally spaced radii, and the ribs on the opposite side of a disc are similarly slotted, but along radii offset from the first set of radii. When a series of these discs is assembled in a stack, downwardly facing ribs of one disc fit between upwardly facing ribs of a disc next below, providing a series of annular passages interconnected by radial slots. Each series of slots is offset and located between the next series and the preceding series, so that the fluid flow is continually divided and recombined for velocity reduction. In addition, the effective area of the radial slots is less than the area of the annular passages, such that the fluid is passed successively through a series of restricted orifices and expansion areas in passing through the valve.
REFERENCES:
patent: Re29714 (1978-08-01), Hayner et al.
patent: 973328 (1910-10-01), Willmann
patent: 3856049 (1974-12-01), Scull
patent: 3917222 (1975-11-01), Kay et al.
Bryant III James E.
Copes-Vulcan Inc.
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