Patent US886876A successfully refreshed from Google Patents.
Patent US3583431A successfully refreshed from Google Patents.
US3583431A
Expired / Lapsed
US
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Pressure relief valve
Assignee: Cessna Aircraft Co
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Filing: 1969-02-17
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Granted: 1971-06-08
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Expires: 1989-02-17
Abstract
Abstract A relief valve with a poppet disposed therein for axial movement and normally spring-biased to a closed position and being actuated to an open pressure-relieving position by a predetermined pressure acting against the poppet face area. The effective poppet area exposed to high pressure enlarges in proportion to the spring rate as the poppet moves against the spring bias, so that the valve maintains constant pressure for different rates of fluid flow through the valve.
Inventors
- 👤 Robert M Diel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:59
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/08; F16K17/0426; F16K17/0433; F16K17/20; F16K17/22; F16K17/24; F16K17/26; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7738; Y10T137/7743; Y10T137/7771; Y10T137/7781; Y10T137/7834; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
341 words
A fluid pressure relief valve comprising: a. a body having a central passage therein and being open at one end to form an outlet and closed at the other end, said body including an inwardly extending protuberant portion positioned intermediate said ends having a first and second shoulder at opposite ends and having an inlet opening into said central passage in the area of said protuberant section; b. a movable poppet positioned in said central passage and having a central bore providing hydraulic communication from inlet to outlet, said poppet having a flanged end cooperating with said first shoulder to limit axial travel, and a converging valve portion; c. a seat in said central passage having a flanged portion engageable with said second shoulder of said body and defining an end chamber extending between the closed end and said seat and being in communication with said inlet, said seat having an annular terminal edge engaging said converging valve portion in a poppet closed position to block fluid flow between said inlet and outlet and providing selective communication therebetween in an open position, the effective location of said terminal edge to said valve portion defining an outlet area of the valve portion within the seat exposed to outlet pressure and an inlet area outside said seat adjacent said iNlet exposed to inlet pressure; d. valve closing means including a resilient biasing member engaging said poppet and urging said poppet to the closed position, the closing force exerted by said valve closing means increasing as the poppet opens and travels away from said seat to place the fluid inlet and outlet in communication through the opening formed between said valve portion and said seat; and e. said valve portion having a surface configuration cooperating with said seat whereby a predetermined inlet pressure acting on said inlet area moves said poppet away from said seat whereupon said inlet area enlarges and said predetermined inlet pressure produces a force on said poppet opposing and proportional to said increasing closing force exerted as said poppet opens
Claim 2
Dependent Claim
341 words
A fluid pressure relief valve comprising: a. a body having a central passage therein and being open at one end to form an outlet and closed at the other end, said body including an inwardly extending protuberant portion positioned intermediate said ends having a first and second shoulder at opposite ends and having an inlet opening into said central passage in the area of said protuberant section; b. a movable poppet positioned in said central passage and having a central bore providing hydraulic communication from inlet to outlet, said poppet having a flanged end cooperating with said first shoulder to limit axial travel, and a converging valve portion; c. a seat in said central passage having a flanged portion engageable with said second shoulder of said body and defining an end chamber extending between the closed end and said seat and being in communication with said inlet, said seat having an annular terminal edge engaging said converging valve portion in a poppet closed position to block fluid flow between said inlet and outlet and providing selective communication therebetween in an open position, the effective location of said terminal edge to said valve portion defining an outlet area of the valve portion within the seat exposed to outlet pressure and an inlet area outside said seat adjacent said iNlet exposed to inlet pressure; d. valve closing means including a resilient biasing member engaging said poppet and urging said poppet to the closed position, the closing force exerted by said valve closing means increasing as the poppet opens and travels away from said seat to place the fluid inlet and outlet in communication through the opening formed between said valve portion and said seat; and e. said valve portion having a surface configuration cooperating with said seat whereby a predetermined inlet pressure acting on said inlet area moves said poppet away from said seat whereupon said inlet area enlarges and said predetermined inlet pressure produces a force on said poppet opposing and proportional to said increasing closing force exerted as said poppet opens
Claim 3
Dependent Claim
31 words
The valve of claim 1 wherein said valve portion surface configuration is frustoconical and tapers inwardly toward said body closed end, and said resilient biasing member comprises a linear gradient spring.
Claim 4
Dependent Claim
37 words
The valve of claim 1 wherein said seat is movably disposed in said housing and additionally includes biasing means acting in said end chamber urging said seat into engagement with said second shoulder and toward said poppet.
Claim 5
Dependent Claim
80 words
The valve of claim 3 wherein said seat biasing means includes a spring in said end chamber extending between said closed end and said movable seat whereby a predetermined drop in pressure in the inlet chamber below the pressure in the outlet chamber will allow the force acting against the seat to cause the seat to retract from said poppet causing a reverse flow of fluid from discharge to inlet to prevent cavitation in the chamber associated with the inlet.
Claim 6
Dependent Claim
318 words
In a relief valve having a body with an inlet and outlet and a communicating passage extending therebetween, a poppet slidably mounted in said passage having a frustoconical face and an outwardly extending flange, first stop means in said body adapted to engage said poppet flange, biasing means engaging said poppet and urging said poppet in a first axial direction to a closed position into engagement with said first stop means, cylindrical seat means in said passage adjacent said poppet, said seat means engageable with said frustoconical face to form a seal permitting selective communication between said inlet and outlet whereby a portion of said face is exposed to pressure in the inlet and a portion of said face is exposed to pressure in the outlet, wherein the improvement comprises: flange means extending outwardly from said seat means; second stop means in said body arranged adjacent said inlet and cooperating with said seat flange means to permit limited bidirectional axial movement of said seat means when said poppet is in said closed position; said seat means having a first differential area exposed to inlet pressure and a second differential area exposed to outlet pressure, whereby the normally higher pressure existing within the inlet urges the seat means toward the poppet in a second axial direction and a predetermined pressure rise in said inlet acts to increase the force on the poppet frustoconical face and seat means urging the poppet and seat means in said second axial direction and to effect separation upon further movement of said poppet after movement of said seat means is arrested by said second stop means; and whereby a predetermined decrease in pressure in said inlet will permit the outlet pressure acting on said second differential area to move said seat means in a first axial direction away from said poppet thereby permitting reverse flow from said outlet to said inlet through said valve.
Claim 7
Dependent Claim
318 words
In a relief valve having a body with an inlet and outlet and a communicating passage extending therebetween, a poppet slidably mounted in said passage having a frustoconical face and an outwardly extending flange, first stop means in said body adapted to engage said poppet flange, biasing means engaging said poppet and urging said poppet in a first axial direction to a closed position into engagement with said first stop means, cylindrical seat means in said passage adjacent said poppet, said seat means engageable with said frustoconical face to form a seal permitting selective communication between said inlet and outlet whereby a portion of said face is exposed to pressure in the inlet and a portion of said face is exposed to pressure in the outlet, wherein the improvement comprises: flange means extending outwardly from said seat means; second stop means in said body arranged adjacent said inlet and cooperating with said seat flange means to permit limited bidirectional axial movement of said seat means when said poppet is in said closed position; said seat means having a first differential area exposed to inlet pressure and a second differential area exposed to outlet pressure, whereby the normally higher pressure existing within the inlet urges the seat means toward the poppet in a second axial direction and a predetermined pressure rise in said inlet acts to increase the force on the poppet frustoconical face and seat means urging the poppet and seat means in said second axial direction and to effect separation upon further movement of said poppet after movement of said seat means is arrested by said second stop means; and whereby a predetermined decrease in pressure in said inlet will permit the outlet pressure acting on said second differential area to move said seat means in a first axial direction away from said poppet thereby permitting reverse flow from said outlet to said inlet through said valve.
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Cited
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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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |