Title:
LOAD SHARING VALVE AND SYSTEM FOR OPERATING CENTRIFUGAL PUMPS IN PARALLEL
Document Type and Number:
WIPO Patent Application WO/2000/060239
Kind Code:
A2
Abstract:
A system for allowing pumps to run in parallel and preventing back flow through a non-operational pump. The system includes a first pump in parallel with a second pump. The system further includes a check valve in fluid communication with the first pump for preventing flow through the first pump when the first pump is not operating. The system further includes a sensing valve in fluid communication with the first pump and the second pump. The system also includes a load sharing valve in fluid communication with the check valve, the sensing valve, and the second pump for controlling a system flow, wherein the system flow is provided by the first pump when the second pump is not operating, and wherein the system flow is provided by the second pump when the first pump is not operating, and wherein the system flow includes a portion of flow from both the first and second pumps when both pumps are operational.
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Inventors:
DYER GERALD P
REUTER CHARLES E
REUTER CHARLES E
Application Number:
PCT/US2000/005939
Publication Date:
October 12, 2000
Filing Date:
March 07, 2000
Export Citation:
Assignee:
UNITED TECHNOLOGIES CORP (US)
International Classes:
F02C7/236; F04B49/00; F04B49/08; F04D13/14; F04D15/00; (IPC1-7): F04D13/00
Foreign References:
| US3442218A | 1969-05-06 | |||
| US2835323A | 1958-05-20 | |||
| EP0657651A1 | 1995-06-14 | |||
| GB1546337A | 1979-05-23 |
Attorney, Agent or Firm:
Kosakowski, Richard H. (CT, US)
Weydert, Robert (Dennemeyer & Associates SA P.O. Box 115 Luxembourg, LU)
Weydert, Robert (Dennemeyer & Associates SA P.O. Box 115 Luxembourg, LU)
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Claims:
Claims
| 1. | A load sharing valve system, including an outlet, for operating a first pump in parallel with a second pump to provide a flow of fluid comprising a first portion of flow provided by said first pump and a second portion of flow provided by said second pump, comprising: a first input in fluid communication with said first pump; a second input in fluid communication with said second pump; a housing; a second spool disposed within said housing; and, a first spool disposed within said second spool wherein said second spool and said first spool are positioned in response to said flow and operation of said first and said second pumps. |
| 2. | The load sharing valve of claim 1 wherein said second spool comprises: a first end defining a second pump window having an area disposed between said second inlet said outlet; an outer wall defining a cavity; a first window having a first area in said outer wall for providing fluid communication between said first inlet and said cavity; a second window having a second area in said outer wall for providing fluid communication between said cavity and the outlet; a second end; and, a second positioning means, located at said second end for positioning said second spool for determining said area of said second pump window and said first area of said first window. |
| 3. | The load sharing valve of claim 2 wherein said first spool comprises: a first end; a second end; and, a first positioning means for positioning said first spool determining said second area of said second window. |
| 4. | The load sharing valve of claim 3 wherein said first area is approximately equal to said area and said first positioning means is approximately equal to said second positioning means for providing a first portion equal to said second portion. |
| 5. | The system of claim 2 wherein said second positioning means comprises a second spring. |
| 6. | The system of claim 3 wherein said first positioning means comprises a first spring. |
| 7. | A system, including a system outlet, for operating a first pump in parallel with a second pump to provide a flow of fluid comprising: a check valve means in fluid communication with said first pump for preventing flow through said first pump when said first is not operating; a sensing valve means in fluid communication with said check valve and said second pump and including a sensing valve outlet for placing the check valve in fluid communication with said sensing valve outlet when said second pump is not operating; a load sharing valve means in fluid communication with said check valve, said sensing valve outlet and said second pump for controlling said flow wherein said flow comprises a first portion of flow provided by said first pump and a second portion of flow provided by said second pump when said first and said second pumps are operating, wherein said flow comprises said first portion when said second pump is not operating, and wherein said flow comprises said second portion when said first pump is not operating. |
| 8. | The system of claim 7 wherein said load sharing valve further comprises: a housing; a second spool disposed within said housing; and, a first spool disposed within said second spool wherein said second spool and said first spool are positioned in response to said flow and operation of said first and said second pumps. |
| 9. | The load sharing valve of claim 8 wherein said second spool comprises: a first end defining a second pump window having an area disposed between said second pump said system outlet; an outer wall defining a cavity; a first window having a first area in said outer wall for providing fluid communication between said first pump and said cavity; a second window having a second area in said outer wall for providing fluid communication between said cavity and the system outlet; a second end; and, a second positioning means, located at said second end for positioning said second spool for determining said area of said second pump window and said first area of said first window. |
| 10. | The load sharing valve of claim 9 wherein said first spool comprises: a first end; a second end; and, a first positioning means for positioning said first spool determining said second area of said second window. |
| 11. | The load sharing valve of claim 10 wherein said first area is approximately equal to said area and said first positioning means is approximately equal to said second positioning means for providing a first portion equal to said second portion. |
| 12. | The system of claim 10 wherein said second spool further comprises a bypass means for providing fluid communication between said sensing valve outlet and said system outlet when said second pump is not operational. |
| 13. | The system of claim 9 wherein said second positioning means comprises a second spring. |
| 14. | The system of claim 10 wherein said first positioning means comprises a first spring. |
Description:
INTERNATIONALSEARCHREPORT Inter rnalAppllcatlonNo .formation on patent family members PCT/US00/05939 PatentdocumentPublication PatentPublication citedinsearchreportdate member(s)date US3442218A06-05-1969NONE US2835323A20-05-1958CH 327443A GB 760703A EP0657651A14-06-1995JP 7253031A03-10-1995 GB1546337A23-05-1979US 4027473A07-06-1977 US 4027474A07-06-1977 CA 1080986A08-07-1980 DE 2709492A15-09-1977 FR 2343180A30-09-1977 IT 1076378B27-04-1985 JP 52113414A22-09-1977 CA 1080985 A 08-07-1980CA 1080985 A 08-07-1980
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