Flow control valve
First Claim
1. A constant-flow valve assembly, comprising:
- a body with a fluid inlet, a fluid outlet, a fluid passageway therebetween, and a piston chamber in fluid communication with the fluid passageway the fluid passageway containing fluid at first, second and third fluid pressures, wherein the third fluid pressure is less than the second fluid pressure, and the second fluid pressure is less than the first fluid pressure;
a piston slidably disposed in the piston chamber and a valve assembly coupled to the fluid passageway and being configured to automatically adjust valve position in response to the first, second or third fluid pressures to provide a substantially constant fluid flow from the fluid outlet substantially independent of the pressure differentials between the second and third fluid pressures; and
a restrictor assembly with the fluid passageway extending therethrough, the restrictor assembly having a first sealing pad, a second sealing pad, and a restrictor with a fluid pathway extending therebetween, the first sealing pad being positioned to receive fluid at the first fluid pressure from a first portion of the fluid passageway and to direct the fluid to the restrictor, and the second sealing pad being positioned to receive fluid from the restrictor and direct fluid to a second portion of the fluid passageway at the second fluid pressure, the restrictor being axially movable to adjust the position of the fluid pathway to adjust a fluid flow rate of fluid through the fluid pathway to the second portion of the fluid passageway, wherein the restrictor has an outer surface, the fluid pathway includes a restrictor entry portion defined by a plurality of blind notches interconnected by at least one blind channel and in fluid communication with a through hole, the restrictor being movable to allow the first sealing pad to interfere with at least a portion of the restrictor entry portion to adjustably restrict the fluid flow into the blind notches, blind channel, or through hole and to control the fluid flow rate through the adjustable restrictor assembly.
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Accused Products
Abstract
A constant-flow valve assembly having a first passageway carrying fluid at a first pressure, a piston chamber, and a second passageway connected to the chamber and carrying fluid at the second pressure. A third passageway carries fluid at a third pressure. An adjustable valve is between the chamber and the third passageway, and an adjustable restrictor is positioned between the first and second passageways. An inlet portion of the restrictor assembly receives fluid at the first pressure and directs the fluid to a restrictor, and outlet portion directs the fluid to the second passageway at the second pressure. The restrictor is movable to adjust the position of entry and exit portions relative to the inlet and outlet portions to adjust a fluid flow rate to the second passageway to adjust the flow rate through the valve assembly.
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Citations
18 Claims
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1. A constant-flow valve assembly, comprising:
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a body with a fluid inlet, a fluid outlet, a fluid passageway therebetween, and a piston chamber in fluid communication with the fluid passageway the fluid passageway containing fluid at first, second and third fluid pressures, wherein the third fluid pressure is less than the second fluid pressure, and the second fluid pressure is less than the first fluid pressure; a piston slidably disposed in the piston chamber and a valve assembly coupled to the fluid passageway and being configured to automatically adjust valve position in response to the first, second or third fluid pressures to provide a substantially constant fluid flow from the fluid outlet substantially independent of the pressure differentials between the second and third fluid pressures; and a restrictor assembly with the fluid passageway extending therethrough, the restrictor assembly having a first sealing pad, a second sealing pad, and a restrictor with a fluid pathway extending therebetween, the first sealing pad being positioned to receive fluid at the first fluid pressure from a first portion of the fluid passageway and to direct the fluid to the restrictor, and the second sealing pad being positioned to receive fluid from the restrictor and direct fluid to a second portion of the fluid passageway at the second fluid pressure, the restrictor being axially movable to adjust the position of the fluid pathway to adjust a fluid flow rate of fluid through the fluid pathway to the second portion of the fluid passageway, wherein the restrictor has an outer surface, the fluid pathway includes a restrictor entry portion defined by a plurality of blind notches interconnected by at least one blind channel and in fluid communication with a through hole, the restrictor being movable to allow the first sealing pad to interfere with at least a portion of the restrictor entry portion to adjustably restrict the fluid flow into the blind notches, blind channel, or through hole and to control the fluid flow rate through the adjustable restrictor assembly. - View Dependent Claims (2, 3)
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4. A constant-flow valve assembly, comprising:
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a body with a fluid inlet, a fluid outlet, a fluid passageway therebetween, the fluid passageway having a first portion containing fluid at a first fluid pressure, a second portion containing fluid at a second fluid pressure less than the first fluid pressure; and an adjustable restrictor assembly between the first and second portions of the fluid passageway, the restrictor assembly having an inlet portion, an outlet portion, and a restrictor with a fluid pathway extending therebetween, the inlet portion being positioned to receive fluid at the first fluid pressure from the first portion of the fluid passageway and to direct the fluid to the restrictor, and the outlet portion being positioned to receive fluid from the restrictor and direct fluid to the second portion of the fluid passageway at the second fluid pressure, the restrictor having an entry portion and an exit portion of the fluid pathway, the restrictor being movable adjust the position of the entry and exit portions relative to the inlet and outlet portions to adjust a fluid flow rate of fluid through fluid pathway to the second portion of the fluid passageway, wherein the restrictor has an outer surface, the fluid pathway includes the entry portion defined by a plurality of blind notches interconnected by at least one blind channel and in fluid communication with a through hole, the restrictor being movable to allow the inlet portion to interfere with at least a portion of the entry portion to adjustably restrict the fluid flow into the blind notches, blind channel, or through hole and to control the fluid flow rate through the adjustable restrictor assembly. - View Dependent Claims (5, 15)
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6. A constant-flow valve assembly, comprising:
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a first fluid passageway configured to carry fluid at a first fluid pressure; a chamber having at least a portion configured to receive fluid at a second fluid pressure less than the first fluid pressure; a second fluid passageway connected to the portion of the piston chamber and configured to carry fluid at the second fluid pressure; and an adjustable restrictor assembly between the first and second fluid passageways, the restrictor assembly having an inlet portion, an outlet portion, and a restrictor with a fluid pathway extending therebetween, the inlet portion being positioned to receive fluid at the first fluid pressure from the first fluid passageway and to direct the fluid to the restrictor, and the outlet portion being positioned to receive fluid from the restrictor and direct fluid to the second fluid passageway at the second fluid pressure, the restrictor having an entry portion and an exit portion of the fluid pathway, the restrictor being movable to adjust the position of the entry and exit portions relative to the inlet and outlet portions to adjust a fluid flow rate of fluid through fluid pathway to the second fluid passageway, wherein the restrictor has an outer surface, the fluid pathway includes the entry portion defined by a plurality of blind notches interconnected by at least one blind channel and in fluid communication with a through hole, the restrictor being movable to allow the inlet portion to interfere with at least a portion of the entry portion to adjustably restrict the fluid flow into the blind notches, blind channel, or through hole and to control the fluid flow rate through the adjustable restrictor assembly. - View Dependent Claims (7, 8, 9, 10, 16)
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11. A constant-flow valve assembly, comprising:
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a body with a fluid inlet, a fluid outlet, a fluid passageway therebetween, the fluid passageway having a first portion containing fluid at a first fluid pressure, a second portion containing fluid at a second fluid pressure less than the first fluid pressure; and an adjustable restrictor assembly between the first and second fluid passageways, the restrictor assembly having an inlet portion, an outlet portion, and a restrictor with a fluid pathway extending therebetween, the inlet portion being positioned to receive fluid at the first fluid pressure from the first fluid passageway and to direct the fluid to the restrictor, and the outlet portion being positioned to receive fluid from the restrictor and direct fluid to the second fluid passageway at the second fluid pressure, the restrictor having an entry portion and an exit portion of the fluid pathway, the restrictor being movable to adjust the position of the entry and exit portions relative to the inlet and outlet portions to adjust a fluid flow rate of fluid through fluid pathway to the second fluid passageway, wherein the restrictor has an outer surface, the fluid pathway includes the entry portion defined by a plurality of blind notches interconnected by at least one blind channel and in fluid communication with a through hole, the restrictor being movable to allow the inlet portion to interfere with at least a portion of the entry portion to adjustably restrict the fluid flow into the blind notches, blind channel, or through hole and to control the fluid flow rate through the adjustable restrictor assembly. - View Dependent Claims (17)
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12. A constant-flow valve assembly, comprising:
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a first fluid passageway with fluid at a first fluid pressure; a chamber containing fluid at a second fluid pressure less than the first fluid pressure; a second fluid passageway connected to the chamber and containing fluid at the second fluid pressure; a restrictor assembly between the first and second fluid passageways, the restrictor assembly having a first sealing pad, a second sealing pad, and a restrictor with a fluid pathway extending therebetween, the first sealing pad engaging the restrictor and being positioned to receive fluid at the first fluid pressure from the first fluid passageway and to direct the fluid to the restrictor, and the second sealing pad engaging the restrictor and being positioned to receive fluid from the restrictor and direct fluid to the second fluid passageway at the second fluid pressure, the restrictor being movable relative to the first and second sealing pads to adjust the position of the fluid pathway relative to the inlet and outlet portions, wherein the restrictor has an outer surface, the fluid pathway includes the entry portion defined by a plurality of blind notches interconnected by at least one blind channel and in fluid communication with a through hole, the restrictor being movable to allow the first sealing pad to interfere with at least a portion of the entry portion to adjustably restrict the fluid flow into the blind notches, blind channel, or through hole and to control the fluid flow rate through the adjustable restrictor assembly. - View Dependent Claims (13, 14, 18)
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Specification