US5320760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of determining filter pluggage by measuring pressures
Assignee: EIDP Inc
•
Filing: 1992-12-07
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Granted: 1994-06-14
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Expires: 2012-12-07
Abstract
Abstract A method to determine differential filter pressure caused by filter pluggage in a high pressure liquid system operated by a computer-operated control valve without the need for a pressure sensor coupled to the filter by corerlating the percent the control valve is open with the differential pressure of the filter. A signal is provided when the percentage of time the control valve is open exceeds a predetermined time and the filter is replaced in response to the signal.
Inventors
- 👤 Kenneth S. Freund
- 👤 Elizabeth L. Frisbie
- 👤 Robert E. Wojcik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:50
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/12; B01D37/00; B01D37/04; B01D37/046; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0396
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
176 words
A method for determining a pressure drop across a filter located between a jet and a pressure control valve that is connected to a pressurized liquid manifold with the aid of a computer to calculate percent openness of the valve and determine when to replace the filter, said method comprising: a) obtaining a data set of manifold pressure, jet pressure set point, and the correlation between percent open and a corresponding flow factor of the pressure control valve; b) providing the computer with a data base that includes the data set obtained in step (a); c) programming the computer to calculate percentage openness of the control valve according to the following relationship: ##EQU2## wherein K 1 and K 2 are constants based on valve manufacturer provided characteristic plot of openness of the valve and resulting flow factor, GPM=gallons per minute, manifold psi=manifold pressure, filter psi=pressure drop across the filter and jet psi jet set point pressure signaling when said % valve the openness exceeds a predetermined value; and replacing said filter in response to said signaling.
Claim 2
Independent Claim
176 words
A method for determining a pressure drop across a filter located between a jet and a pressure control valve that is connected to a pressurized liquid manifold with the aid of a computer to calculate percent openness of the valve and determine when to replace the filter, said method comprising: a) obtaining a data set of manifold pressure, jet pressure set point, and the correlation between percent open and a corresponding flow factor of the pressure control valve; b) providing the computer with a data base that includes the data set obtained in step (a); c) programming the computer to calculate percentage openness of the control valve according to the following relationship: ##EQU2## wherein K 1 and K 2 are constants based on valve manufacturer provided characteristic plot of openness of the valve and resulting flow factor, GPM=gallons per minute, manifold psi=manifold pressure, filter psi=pressure drop across the filter and jet psi jet set point pressure signaling when said % valve the openness exceeds a predetermined value; and replacing said filter in response to said signaling.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein K 1 is 28.52 and K 2 is 26.55.
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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) | 1997-06-13 | 1997-12-13 | 1998-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-13 | 2001-12-13 | 2002-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-13 | 2005-12-13 | 2006-06-14 | $7700.00 | Window Closed / Lapsed |