US4181611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter thermal bypass valve
Assignee: Case LLC
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Filing: 1979-01-22
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Granted: 1980-01-01
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Expires: 1999-01-22
Abstract
Abstract A filter thermal bypass valve has an opening defining a seat, a thermal actuator including a plunger capable of being forced toward the seat in response to increases in temperature, a spring retainer capable of movement toward and away from the seat, a rod member affixed to the spring retainer and having an enlarged head portion with a valve plate slidable thereon, a first compression spring forces the retainer in contact with the plunger and a second compression spring urges the valve plate against the seat.
Inventors
- 👤 Raymond D. Rubenstein
- 👤 Russell E. Janke
- 👤 Charles L. Rescorla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:08
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/114; B01D29/50; B01D29/52; B01D35/00; B01D35/02; B01D35/027; B01D35/14; B01D35/147; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7737
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
A thermal and pressure differential valve for a fluid filter comprising: a housing adapted to receive a filter element, and having an opening defining a seat; a mounting strap strap affixed to said housing; a thermal actuator affixed to said strap and having a plunger capable of being forced toward said seat in response to increases in temperatures; a spring retainer slidably mounted in said mounting strap and capable of movement toward and away from said seat; a rod member affixed to said spring retainer and having an enlarged head portion; a valve plate slidably carried on said rod member between said retainer and said head portion; a first compression spring trapped between said housing and said retainer for forcing the latter into contact with said plunger; a second compression spring trapped between said valve plate and said retainer urging said valve plate against said seat but permitting said valve plate to move away from said seat when a predetermined pressure differential across said valve plate exists.
Claim 2
Dependent Claim
167 words
A thermal and pressure differential valve for a fluid filter comprising: a housing adapted to receive a filter element, and having an opening defining a seat; a mounting strap strap affixed to said housing; a thermal actuator affixed to said strap and having a plunger capable of being forced toward said seat in response to increases in temperatures; a spring retainer slidably mounted in said mounting strap and capable of movement toward and away from said seat; a rod member affixed to said spring retainer and having an enlarged head portion; a valve plate slidably carried on said rod member between said retainer and said head portion; a first compression spring trapped between said housing and said retainer for forcing the latter into contact with said plunger; a second compression spring trapped between said valve plate and said retainer urging said valve plate against said seat but permitting said valve plate to move away from said seat when a predetermined pressure differential across said valve plate exists.
Claim 3
Dependent Claim
23 words
A valve according to claim 1 and further comprising: a spring means for forcing said housing into tight engagement with said filter element.
Claim 4
Dependent Claim
201 words
In a tractor housing having a central suction line and pair of inlets leading to separate pumps with a pair of facing filter thermal bypass valves mounted in said housing one each between the suction line and one of the pump inlets, each bypass valve having a valve housing adapted to receive a filter element and having an opening defining a seat; a mounting strap affixed to said housing; a thermal actuator affixed to said strap and having a plunger capable of being forced toward said seat in response to increases in temperature; a spring retainer slidably mounted in said mounting strap and capable of movement toward and away from said seat; a rod member affixed to said spring retainer and having an enlarged head portion; a valve plate slidably carried on said rod member between said retainer and said head portion; a first compression spring trapped between said housing and said retainer for forcing the latter into contact with said plunger; a second impression spring trapped between said valve plate and said retainer urging said plate against said seat but permitting said valve plate to move away from said seat when a predetermined pressure differential across said valve plate exists.
Claim 5
Dependent Claim
201 words
In a tractor housing having a central suction line and pair of inlets leading to separate pumps with a pair of facing filter thermal bypass valves mounted in said housing one each between the suction line and one of the pump inlets, each bypass valve having a valve housing adapted to receive a filter element and having an opening defining a seat; a mounting strap affixed to said housing; a thermal actuator affixed to said strap and having a plunger capable of being forced toward said seat in response to increases in temperature; a spring retainer slidably mounted in said mounting strap and capable of movement toward and away from said seat; a rod member affixed to said spring retainer and having an enlarged head portion; a valve plate slidably carried on said rod member between said retainer and said head portion; a first compression spring trapped between said housing and said retainer for forcing the latter into contact with said plunger; a second impression spring trapped between said valve plate and said retainer urging said plate against said seat but permitting said valve plate to move away from said seat when a predetermined pressure differential across said valve plate exists.
Claim 6
Dependent Claim
47 words
In a device according to claim 3 wherein each of said by-pass valves has a leaf spring affixed at one end to the associated valve housing and means securing said leaf springs to each other; whereby the pair of by-pass valves may be handled as a unit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |