Patent US3868198A successfully refreshed from Google Patents.
US3868198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surge control
Assignee: TRI MATIC
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Filing: 1973-06-04
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Granted: 1975-02-25
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Expires: 1993-06-04
Abstract
Abstract A bleed tube extends upward from the inlet of a pump. The bleed tube is closed at the top and has a plurality of perforations therein. As the level of the reservoir lowers below these perforations, air is drawn into the inlet of the pump inversely proportional to the reservoir level. At the outlet of the pump, the air is separated from the liquid and the air is used to reduce the fluid flow. A plurality of choke valves are used in a long line, each choke valve being controlled by the air in the pipe at that point. This prevents water hammer at the beginning of fluid flow.
Inventors
- 👤 Rufus J Purtell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:57
CPC Classifications
F; F04; F04D; F04D15/00; F04D15/02; F04D15/0209; F04D15/0218; F04D15/0005; F04D15/0022; F04D15/0077; F04D15/0083; F04D9/00; F04D9/007
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
106 words
In a liquid pumping system having a. a pump with i. an inlet and ii. an outlet pipe, b. said inlet submerged in a liquid reservoir, and c. an air trap on the outlet pipe; d. THE IMPROVED STRUCTURE COMPRISING: e. a bleed tube with f. a bleed tube outlet at the submerged pump inlet, g. said bleed tube extending upward from said pump inlet, h. a plurality of spaced apart holes in the bleed tube, j. an air tube from the air trap on the outlet to k. an air motor, and m. control means attached to said air motor for controlling the fluid flow.
Claim 2
Dependent Claim
106 words
In a liquid pumping system having a. a pump with i. an inlet and ii. an outlet pipe, b. said inlet submerged in a liquid reservoir, and c. an air trap on the outlet pipe; d. THE IMPROVED STRUCTURE COMPRISING: e. a bleed tube with f. a bleed tube outlet at the submerged pump inlet, g. said bleed tube extending upward from said pump inlet, h. a plurality of spaced apart holes in the bleed tube, j. an air tube from the air trap on the outlet to k. an air motor, and m. control means attached to said air motor for controlling the fluid flow.
Claim 3
Dependent Claim
21 words
The invention as defined in claim 1 with an additional limitation of n. a bleed valve connected to the air tube.
Claim 4
Dependent Claim
33 words
The invention as defined in claim 1 wherein said control means is in the form of n. a choke valve in the outlet pipe adjacent the air trap to which it is connected.
Claim 5
Dependent Claim
32 words
The invention as defined in claim 3 with additional limitations of o. additional air traps in the outlet pipe, p. all of said air traps spaced apart from all other air traps.
Claim 6
Dependent Claim
21 words
The invention as defined in claim 4 with an additional limitation of q. a bleed valve connected to the air tube.
Claim 7
Dependent Claim
109 words
In a liquid pumping system having a. a pump with i. an inlet and ii. an outlet pipe, b. said inlet submerged in a liquid reservoir, and c. an air trap in the outlet; d. THE IMPROVED STRUCTURE COMPRISING: e. at least one additional air trap in the outlet pipe spaced from all other air traps, f. an air tube from each air trap, g. an air motor attached to each air tube, and h. a choke valve in the outlet pipe connected to each air motor, j. so that at any point there is air in the outlet pipe the fluid flow is choked to lessen water hammer.
Claim 8
Dependent Claim
109 words
In a liquid pumping system having a. a pump with i. an inlet and ii. an outlet pipe, b. said inlet submerged in a liquid reservoir, and c. an air trap in the outlet; d. THE IMPROVED STRUCTURE COMPRISING: e. at least one additional air trap in the outlet pipe spaced from all other air traps, f. an air tube from each air trap, g. an air motor attached to each air tube, and h. a choke valve in the outlet pipe connected to each air motor, j. so that at any point there is air in the outlet pipe the fluid flow is choked to lessen water hammer.
Claim 9
Dependent Claim
48 words
The invention as defined in claim 6 with additional limitations of k. a bleed tube with m. a bleed tube outlet at the submerged pump inlet, n. said bleed tube extending upward from said pump inlet, and o. a plurality of spaced apart holes in the bleed tube.
Claim 10
Dependent Claim
81 words
In a liquid pumping system having a. a pump with i. an inlet and ii. an outlet pipe, b. said inlet submerged in a liquid reservoir, and c. an air trap in the outlet; d. THE IMPROVED METHOD COMPRISING: e. supplying small amounts of additional fluid into the inlet at a level above the main liquid inlet, f. detecting the presence of air in the outlet, and g. reducing the fluid flow responsive to the presence of air in the outlet.
Claim 11
Dependent Claim
81 words
In a liquid pumping system having a. a pump with i. an inlet and ii. an outlet pipe, b. said inlet submerged in a liquid reservoir, and c. an air trap in the outlet; d. THE IMPROVED METHOD COMPRISING: e. supplying small amounts of additional fluid into the inlet at a level above the main liquid inlet, f. detecting the presence of air in the outlet, and g. reducing the fluid flow responsive to the presence of air in the outlet.
Claim 12
Dependent Claim
44 words
The invention as defined in claim 8 with additional limitations of h. reducing the fluid flow proportional to the amount of air detected in the outlet, j. so that as more air is detected in the outlet, the reduction of fluid flow is greater.
Claim 13
Dependent Claim
48 words
The invention as defined in claim 8 with additional limitations of h. detecting the presence of air at a plurality of points spaced along the outlet pipe, and j. choking the fluid flow in the outlet pipe at each point of detection of air in the outlet pipe.
Claim 14
Dependent Claim
25 words
The invention as defined in claim 8 with an additional limitation of h. bleeding away the detected air in the outlet at an adjustable rate.
Claim 15
Dependent Claim
44 words
The invention as defined in claim 11 with additional limitations of j. reducing the fluid flow proportional to the amount of air detected in the outlet, k. so that as more air is detected in the outlet, the reduction of fluid flow is greater.
Claim 16
Dependent Claim
48 words
The invention as defined in claim 12 with additional limitations of m. detecting the presence of air at a plurality of points spaced along the outlet pipe, and n. choking the fluid flow in the outlet pipe at each point of detection of air in the outlet pipe.
Claim 17
Dependent Claim
76 words
In a liquid pumping system having a. a pump with i. an inlet and ii. an outlet pipe, b. said inlet submerged in a liquid reservoir, and c. an air trap in the outlet; d. THE IMPROVED METHOD OF LESSENING WATER HAMMER IN LONG OUTLET PIPES COMPRISING: e. detecting air in the outlet pipe at plurality of spaced apart points, and f. choking the fluid flow in the outlet pipe at each point air is detected.
Claim 18
Dependent Claim
76 words
In a liquid pumping system having a. a pump with i. an inlet and ii. an outlet pipe, b. said inlet submerged in a liquid reservoir, and c. an air trap in the outlet; d. THE IMPROVED METHOD OF LESSENING WATER HAMMER IN LONG OUTLET PIPES COMPRISING: e. detecting air in the outlet pipe at plurality of spaced apart points, and f. choking the fluid flow in the outlet pipe at each point air is detected.
Claim 19
Dependent Claim
49 words
The invention as defined in claim 14 with additional limitations of g. choking the flow of fluid in the pipe proportional to the amount of air detected in the pipe, h. so that as more air is detected the greater the choking, thus the greater reduction of fluid flow.
Claim 20
Dependent Claim
26 words
The invention as defined in claim 14 with an additional limitation of g. bleeding away the detected air at each point detected at an adjustable rate.
Claim 21
Dependent Claim
49 words
The invention as defined in claim 16 with additional limiTations of h. choking the flow of fluid in the pipe proportional to the amount of air detected in the pipe, j. so that as more air is detected the greater the choking, thus the greater reduction of fluid flow.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |