US3871397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve combination for an oil burner installation
Assignee: Danfoss AS
•
Filing: 1973-08-06
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Granted: 1975-03-18
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Expires: 1993-08-06
Abstract
Abstract The invention relates to an oil burner fuel pump assembly. The assembly has three construction features which are (1) a cut-off valve which opens fully immediately after the pump is started and snaps shut immediately after the pump is turned off, (2) a regulating valve for maintaining a constant pressure for the nozzle and (3) a by-pass valve for instantly unloading the cutoff valve when the pump is turned off. A restriction to the fluid being exhausted in the pressure regulating function provides a pressure drop which is utilized to maintain the by-pass valve in an inoperative position during operation of the assembly. When the pump pressure diminishes the pressure drop likewise recedes and this recession is sensed by the by-pass valve which responds by moving to an operative position for unloading the cut-off valve.
Inventors
- 👤 Peder Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:21
CPC Classifications
F; F23; F23K; F23K5/00; F23K5/02; F23K5/04; F23K5/14; F23K5/147; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2607
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
An oil burner fuel pump assembly comprising a casing having an inlet port and an outlet port, a nozzle, a fluid pressure operated spring biased main valve cooperable with said nozzle, exhaust port means in said casing cooperable with said main valve to regulate the pressure at said nozzle, fluid pressure operated spring biased restrictor valve means downstream from said exhaust port means cooperable with said casing to increasingly restrict the flow of fluid emanating from said exhaust port means in response to the pressure of the fluid in said exhaust port means, and bypass valve means responsive to the pressure difference on opposite side of said restrictor valve means to cause bypassing of pressurized fluid from said inlet port to said outlet port when said pressure difference drops to a predetermined minimum value to present dribbling of said nozzle.
Claim 2
Dependent Claim
140 words
An oil burner fuel pump assembly comprising a casing having an inlet port and an outlet port, a nozzle, a fluid pressure operated spring biased main valve cooperable with said nozzle, exhaust port means in said casing cooperable with said main valve to regulate the pressure at said nozzle, fluid pressure operated spring biased restrictor valve means downstream from said exhaust port means cooperable with said casing to increasingly restrict the flow of fluid emanating from said exhaust port means in response to the pressure of the fluid in said exhaust port means, and bypass valve means responsive to the pressure difference on opposite side of said restrictor valve means to cause bypassing of pressurized fluid from said inlet port to said outlet port when said pressure difference drops to a predetermined minimum value to present dribbling of said nozzle.
Claim 3
Dependent Claim
39 words
A fuel pump assembly according to claim 1 wherein said by-pass valve means is in a flow path parallel to the flow path of said restrictor valve means, and check valve means in series with said by-pass valve means.
Claim 4
Dependent Claim
44 words
A fuel pump assembly according to claim 1 including a connection between said restrictor valve means and said by-pass valve means which causes both of said valve means to move in opening directions in unison and a delayed closing for said bypass valve means.
Claim 5
Dependent Claim
30 words
A fuel pump assembly according to claim 1 wherein the setting of said restrictor valve means is directly dependent upon the quantitative flow of fluid through said exhaust port means.
Claim 6
Dependent Claim
16 words
A fuel pump assembly according to claim 3 wherein said connection includes piston and cylinder elements.
Claim 7
Dependent Claim
89 words
A fuel pump assembly according to claim 2 wherein said by-pass valve means includes a collar portion cooperable with said inlet port and a central stepped down cylinder portion closed at one end, a piston portion connected to said restrictor valve means and being slidably disposed on said piston portion, a stop ring slidably disposed on said piston portion, said stop ring being cooperable with said restrictor valve means to form an expansible chamber fed by said exhaust port means for setting the position of said by-pass valve means.
Claim 8
Dependent Claim
47 words
A fuel pump assembly according to claim 6 wherein said piston portion has a port and a hollow center which form a part of said by-pass flow path, and a port in said cylinder portion registerable with said piston portion port to complete said by-pass flow path.
References Cited (Backward Citations)
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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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |