Flow control valve

• US 7,770,595 B2
• Filed: 04/27/2007
• Issued: 08/10/2010
• Est. Priority Date: 04/27/2006
• Status: Active Grant

• Current Assignee: SkoFlo Industries, Inc.
• Original Assignee: SkoFlo Industries, Inc.
• Inventors: Kirchner, Mark W., Tomlinson, John D.
• Primary Examiner(s): HEPPERLE, STEPHEN M
• Application Number:
  US11/741,477
• Publication Number:
  US 20070289640A1
• Time in Patent Office: 1,201 Days
• Field of Search: 137/501, 137/625.3, 137/625.38, 137/625.39, 251/327
• US Class Current: 137/501
• CPC Class Codes: F16K 47/04 for decreasing pressure or noise level, the throttle being incorporated in the closure member
• CPC Class Codes: G05D 7/014 using sliding elements
• CPC Class Codes: Y10T 137/2597 Variable choke resistance
• CPC Class Codes: Y10T 137/7788 Pressures across fixed choke
• CPC Class Codes: Y10T 137/7791 Pressures across flow line valve
• CPC Class Codes: Y10T 137/7792 Movable deflector or choke
• CPC Class Codes: Y10T 137/86734 With metering feature
• CPC Class Codes: Y10T 137/86799 With internal flow passage
• CPC Class Codes: Y10T 137/86807 Sequential opening or closing of serial ports in single flow line
• CPC Class Codes: Y10T 137/87917 Flow path with serial valves and/or closures

Abstract

In one embodiment, a constant-flow valve assembly is provided that comprises a first fluid passageway carrying fluid at a first fluid pressure, a piston chamber, and a second fluid passageway connected to the chamber and carrying fluid at the second fluid pressure. A third fluid passageway is configured to carry fluid at a third fluid pressure. An adjustable valve member is provided between the chamber and the third passageway to provide constant fluid flow to the third passageway. An adjustable restrictor assembly is positioned between the first and second fluid passageways. An inlet portion of the restrictor assembly receives fluid at the first fluid pressure and directs the fluid to a restrictor. An outlet portion receives fluid from the restrictor and directs the fluid to the second fluid passageway at the second fluid 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 through fluid pathway to the second fluid passageway, thereby adjusting the flow rate through the valve assembly.

Claims

1. A constant-flow valve assembly, comprising:

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;

a third fluid passageway configured to carry fluid at a third fluid pressure less than the first and second fluid pressures;

a piston slideably disposed in the chamber;

a biased valve member having a valve seat adjacent to the third passageway, a valve body, and a first biasing member coupled to the piston, and a second biasing member coupled to the valve body being urged by the second biasing member toward the valve seat and configured to provide a substantially constant fluid flow to the third passageway past the valve seat substantially independent of the pressure differentials between the second and third fluid pressures; 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 and to automatically adjust the biased valve member for a constant flow rate of fluid through the valve assembly, and wherein the restrictor comprises a sleeve with an interior area and a central member disposed in the interior area, the fluid pathway extends through the sleeve and around the central member.

2. The assembly of claim 1 wherein the restrictor has an outer surface, the fluid pathway includes the entry portion defined by at least one a blind notch in the outer surface 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 through the restrictor and to control the fluid flow rate through the adjustable restrictor assembly.

3. The assembly of claim 1 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.

4. The assembly of claim 3 wherein the restrictor body is movable so at least a portion of the through hole remains uncovered and at least one blind notch adjacent to the through hole is fully covered, whereby the through hold receives a fluid simultaneously in parallel from the covered blind notch and directly from the inlet portion.

5. The assembly of claim 1 wherein the restrictor includes an exterior surface with the entry portion thereon, and the inlet portion includes a body segment with an aperture in fluid communication with the first fluid passageway and with the entry portion, the body segment engaging the exterior surface of the restrictor body so at least a portion of the aperture is in direct fluid communication with the entry portion.

6. The assembly of claim 1, further comprising an external adjustment device coupled to the restrictor assembly, the adjustment device being manipulatable to move the restrictor assembly to change the position of the restrictor relative to the inlet portion.

7. The assembly of claim 1 wherein the restrictor has an outer surface, the fluid pathway includes the exit portion defined by at least one a blind notch in the outer surface and in fluid communication with a through hole, the restrictor being movable to allow the outlet portion to interfere with at least a portion of the exit portion to adjustably restrict the fluid flow into through the restrictor and to control the fluid flow rate through the adjustable restrictor assembly.

8. A constant-flow valve assembly, comprising:

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 portion of the chamber and containing fluid at the second fluid pressure;

a third fluid passageway with fluid at a third fluid pressure less than the first and second fluid pressures;

a biased valve member having a valve seat adjacent to the third passageway, a valve body, and a first biasing member coupled to the piston, and a second biasing member, the valve body being urged by the second biasing member toward the valve seat and configured to provide a substantially constant fluid flow to the third passageway past the valve seat substantially independent of the pressure differentials between the second and third fluid pressures; and

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 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 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 to adjust the position of the fluid pathway relative to the inlet and outlet portions to adjust a fluid flow rate of fluid through fluid pathway to the second fluid passageway, thereby automatically adjusting the biased valve member to provide a substantially continuous flow rate through the valve assembly independent of the pressure differentials, and wherein the restrictor comprises a sleeve with an interior area and a central member disposed in the interior area, the fluid pathway extends through the sleeve and around the central member.

9. The assembly of claim 8 wherein the restrictor has an outer surface, the fluid pathway includes the entry portion defined by at least one a blind notch in the outer surface and in fluid communication with a through hole, the restrictor being movable to allow the first sealing pad to cover at least a portion of the entry portion to adjustably restrict the fluid flow into through the restrictor and to control the fluid flow rate through the adjustable restrictor assembly.

10. The assembly of claim 8 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.

11. The assembly of claim 8, further comprising an external adjustment device coupled to the restrictor assembly, the adjustment device being manipulatable to move the restrictor assembly to change the position of the restrictor relative to at least one of the first and second sealing pads.

12. A constant-flow valve assembly, comprising:

a body portion having a first fluid inlet, a piston chamber, and a first fluid outlet, the first fluid inlet configured to receive fluid at a first fluid pressure, the piston chamber having a first portion exposed to the fluid at the first fluid pressure and having a second portion exposed to fluid having a second fluid pressure less than the first fluid pressure, and the first fluid outlet configured to carry fluid at a third fluid pressure less than the first and second fluid pressures;

a piston slideably disposed in the piston chamber;

a seal in the piston chamber between the piston and the body and separating one portion of the fluid at the first fluid pressure and another portion of the fluid at the second fluid pressure;

a valve member coupled to the piston in the second portion of the piston chamber and configured to provide a substantially constant fluid flow from the second portion of the piston chamber toward the outlet substantially independent of the pressure differentials between the first, second, and third fluid pressures;

a first fluid passageway connected to the first portion of the piston chamber and configured to contain fluid at the first fluid pressure;

a second fluid passageway connected to the second portion of the piston chamber and configured to contain fluid at the second fluid pressure; and

an adjustable restrictor assembly coupled to the body between the first and second fluid passageways, the restrictor assembly having a second inlet, a second outlet, and restrictor body with a fluid pathway extending therebetween, the second inlet positioned to receive fluid from the first fluid passageway, and the second outlet positioned to direct fluid to the second fluid passageway, the restrictor body having an entry portion and an exit portion of the fluid pathway, the restrictor body being movable relative to the second inlet to adjust how much of the entry portion is uncovered by the second inlet to receive fluid directly therefrom and how much of the entry portion is covered by the second inlet to restrict a flow rate through the entry portion to the exit portion, thereby adjusting the flow rate through the valve assembly independent of the differences in the first, second, and third fluid pressures, and wherein the restrictor body comprises a sleeve with an interior area and a central member disposed in the interior area, the fluid path extends through the sleeve and around the central member.

13. The assembly of claim 12 wherein the restrictor body has an outer surface with at least one a blind channel in fluid communication with an aperture to define the entry portion, the restrictor body being movable relative to the second inlet to cover at least a portion of the aperture and the blind channel on the outer surface to adjust the fluid flow rate through the flow pathway.

14. The assembly of claim 12 wherein the restrictor body has an outer surface with a plurality of blind receptacles interconnected in series by channels and in fluid communication with an aperture to define the entry portion, the restrictor body being movable relative to the second inlet to cover at least a portion of the aperture and one or more of the blind receptacles to adjust the fluid flow rate through the flow pathway.

15. The assembly of claim 14 wherein the restrictor body is movable so at least a portion of the aperture remains uncovered and at least one blind receptacle adjacent to the aperture is fully covered, whereby the aperture receives a fluid simultaneously in parallel from the covered receptacle and directly from the second inlet.

16. The assembly of claim 12 wherein the restrictor body is a shaft with an aperture therethrough, the fluid pathway extending through the aperture in the shaft.

17. The assembly of claim 12 wherein the restrictor body includes an exterior surface with the entry portion thereon, and the second inlet includes a body segment with an aperture in fluid communication with the first fluid passageway and with the entry portion, the body segment engaging the exterior surface of the restrictor body so at least a portion of the aperture is in direct fluid communication with the entry portion.

18. The assembly of claim 12, further comprising an external adjustment device coupled to the restrictor assembly, the adjustment device being manipulatable to move the restrictor assembly to change the position of the restrictor body relative to the second inlet.

19. The assembly of claim 12 wherein the restrictor body has an outer surface with at least one a blind channel in fluid communication with an aperture to define the exit portion, the restrictor body being movable relative to the second outlet to cover at least a portion of the aperture and the blind channel on the outer surface to adjust the fluid flow rate through the flow pathway.

20. The assembly of claim 12 wherein the restrictor body has an outer surface with a plurality of blind receptacles interconnected in series by channels and in fluid communication with an aperture to define the exit portion, the restrictor body being movable relative to the second outlet to cover at least a portion of the aperture and one or more of the blind receptacles to adjust the fluid flow rate through the flow pathway.

21. The assembly of claim 20 wherein the restrictor body is movable so at least a portion of the aperture remains uncovered and at least one blind receptacle adjacent to the aperture is fully covered.

22. The assembly of claim 12 wherein the restrictor body includes an exterior surface with the exit portion thereon, and the second outlet includes a body segment with an aperture therethrough in fluid communication with the first fluid passageway and with the entry portion, the body segment sealably engaging the exterior surface of the restrictor body so at least a portion of the aperture is in direct fluid communication with the exit portion.

23. A constant-flow valve assembly, comprising:

a body portion having a first fluid inlet, a piston chamber, and a first fluid outlet, the first fluid inlet configured to receive fluid at a first fluid pressure, the piston chamber having a first portion exposed to the fluid at the first fluid pressure and having a second portion exposed to fluid having a second fluid pressure less than the first fluid pressure, and the first fluid outlet configured to carry fluid at a third fluid pressure less than the first and second fluid pressures;

a piston slideably disposed in the piston chamber;

a seal in the piston chamber between the piston and the body and separating one portion of the fluid at the first fluid pressure and another portion of the fluid at the second fluid pressure;

a valve member coupled to the piston in the second portion of the piston chamber and configured to provide a substantially constant fluid flow from the second portion of the piston chamber toward the outlet substantially independent of the pressure differentials between the first, second, and third fluid pressures;

a first fluid passageway connected to the first portion of the piston chamber and configured to contain fluid at the first fluid pressure;

a second fluid passageway connected to the second portion of the piston chamber and configured to contain fluid at the second fluid pressure; and

an adjustable restrictor assembly coupled to the body between the first and second fluid passageways, the restrictor assembly having a second inlet portion, a second outlet portion, and restrictor body with a fluid pathway extending therebetween, the second inlet portion positioned to receive fluid from the first fluid passageway, and the second outlet portion positioned to direct fluid to the second fluid passageway, the restrictor body having an entry portion and an exit portion of the fluid pathway, the restrictor body being movable relative to the second inlet portion to adjust how much of the entry portion is uncovered by the second inlet portion to receive fluid directly therefrom and how much of the entry portion is covered by the second inlet portion to restrict a flow rate through the entry portion to the exit portion, thereby adjusting the flow rate through the valve assembly independent of the differences in the first, second, and third fluid pressures wherein the restrictor body of the adjustable restrictor assembly is a portion of a central shaft, the central shaft having an end portion having a passageway therein adjacent to the valve member and configured to direct fluid from the valve member to the outlet.