Labyrinth trim valve
First Claim
1. A fluid flow restrictor means for use in a high pressure control valve or the like, which comprises(a) a valve body including an inlet passage and an outlet passage,(b) a valve seat arranged intermediate the inlet and outlet passages,(c) a valve plug mounted for axial movement within the confines of said valve body and arranged for a mating relation with said valve seat to open and close said valve,(d) a plurality of closely interfitting concentric cylinders alternately mounted to the valve plug and valve seat,(e) means forming fluid flow paths through the interfitting cylinders from the inlet passage to the outlet passage including a plurality of slot-like expansion chambers formed through each of said cylinders and areas of restricted flow passage between expansion chambers with each of the expansion chambers of the internal cylinders of the interfitting concentric cylinders being separated from each adjacent expansion chamber of the two contiguous cylinders by one of said areas of restricted flow passage, thereby providing controlled dissipation of the fluid energy,(f) the geometric dimensions of said fluid flow paths being variable in accordance with the axial movement of the cylinders mounted to said valve plug to thereby vary the dimensions of said restricted flow passages between expansion chambers.
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Accused Products
Abstract
A fluid flow restrictor for use in a high pressure valve or the like which comprises a series of closely interfitting concentric cylinders alternately attached to the valve seat and an axially movable valve plug of the valve. In one advantageous embodiment of the invention, various arrangements of slot openings are formed through the several cylinders. The slot openings may be of any geometric shape, for example, rectangular or trapezoidal, and are of sufficient volume to act as expansion chambers for a compressible fluid. The openings of each cylinder communicate with the openings of an adjacent cylinder by various overlapping relationships between openings or by viscous friction flow paths between the cylinders to form restricting flow paths therebetween. Axial displacement of the valve plug will move the interfitting cylinders with respect to one another to vary the flow path dimensions between the slot openings of the cylinders. In another specific form of the invention, the interfitting cylinders are slotless, providing a viscous friction flow path between cylinders and expansion chambers above the open ends of each cylinder and between adjacent cylinders.
35 Citations
17 Claims
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1. A fluid flow restrictor means for use in a high pressure control valve or the like, which comprises
(a) a valve body including an inlet passage and an outlet passage, (b) a valve seat arranged intermediate the inlet and outlet passages, (c) a valve plug mounted for axial movement within the confines of said valve body and arranged for a mating relation with said valve seat to open and close said valve, (d) a plurality of closely interfitting concentric cylinders alternately mounted to the valve plug and valve seat, (e) means forming fluid flow paths through the interfitting cylinders from the inlet passage to the outlet passage including a plurality of slot-like expansion chambers formed through each of said cylinders and areas of restricted flow passage between expansion chambers with each of the expansion chambers of the internal cylinders of the interfitting concentric cylinders being separated from each adjacent expansion chamber of the two contiguous cylinders by one of said areas of restricted flow passage, thereby providing controlled dissipation of the fluid energy, (f) the geometric dimensions of said fluid flow paths being variable in accordance with the axial movement of the cylinders mounted to said valve plug to thereby vary the dimensions of said restricted flow passages between expansion chambers.
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2. A fluid flow restrictor means for use in a high pressure control valve or the like, which comprises
(a) a valve body, including an inlet passage and an outlet passage, (b) a valve seat arranged intermediate the inlet and outlet passages, (c) a valve plug mounted for axial movement within the confines of said valve body and arranged for a mating relation with said valve seat to open and close said valve, (d) a plurality of fixed, spaced, concentric cylinders associated with said valve seat, (e) a plurality of movable, spaced, concentric cylinders associated with said valve plug and arranged for a close interfitting relation between the fixed concentric cylinders whereby axial movement of the valve plug will vary the axial orientation of the interfitting concentric cylinders, (f) means forming a plurality of expansion chambers in each of said cylinders for limited, controlled energy dissipation of a fluid flowing through said valve, and (g) said interfitting cylinders being so arranged and configured whereby restricting flow paths provide fluid communication between expansion chambers of adjacent cylinders, (h) each of the expansion chambers of the internal cylinders of the interfitting concentric cylinders being separated from adjacent expansion chambers of the two contiguous cylinders by the restricting flow paths, (i) the dimensions of said restricting flow paths being variable with the axial movement of the cylinders associated with said valve plug, and (j) said means forming a plurality of expansion chambers comprising a plurality of slots formed through the walls of each of said cylinders, (k) the volume of each of said slots being sufficient to permit expansion of fluid flowing therethrough.
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6. A fluid flow restrictor means for use in a high pressure control valve or the like, which comprises
(a) a valve body including an inlet passage and an outlet passage, (b) a valve seat arranged intermediate the inlet and outlet passages, (c) a valve plug mounted for axial movement within the confines of said valve body and arranged for a mating relation with said valve seat to open and close said valve, (d) a plurality of close interfitting concentric cylinders alternately mounted to the valve plug and valve seat, (e) means forming fluid flow paths through the interfitting cylinders from the inlet passage to the outlet passage including a plurality of expansion chambers formed within each of said cylinders and areas of restricted flow passage between expansion chambers with each of the expansion chambers of the internal cylinders of the interfitting concentric cylinders being separated from each adjacent expansion chamber of the two contiguous cylinders by one of said areas of restricted flow passage, thereby providing controlled dissipation of the fluid energy, (f) the geometric dimensions of said fluid flow paths being variable in accordance with the axial movement of the cylinders mounted to said valve plug to thereby vary the dimensions of said restricted flow passages between expansion chambers, (g) said means forming fluid flow paths comprising rectangular slot openings formed in said cylinders, (h) the angular orientation of said cylinders being arranged whereby the slot openings of adjacent cylinders are in an overlapping relation to form restricting orifices for flow communication between the slot openings.
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7. A fluid flow restrictor means for use in a passage-forming means conducting high pressure fluid or the like, which comprises
(a) a plurality of closely, interfitting concentric cylinders mounted within said passage-forming means, and dividing said passage-forming means to form an inlet and outlet means for fluid flow, (b) alternate ones of said interfitting cylinders being arranged for controlled movement with respect to the others of said cylinders, and (c) means forming fluid flow paths through said concentric cylinders comprising a plurality of slot-like expansion chambers formed through each of said cylinders and areas of restricted flow passage between said expansion chambers with each of the expansion chambers of the internal cylinders of the interfitting concentric cylinders being separated from each adjacent expansion chamber of the two contiguous cylinders by one of said areas of restricted flow passages, thereby providing controlled dissipation of fluid energy, (d) the geometric dimensions of said fluid flow paths being variable in accordance with the axial position of said movable cylinders.
Specification