Patent US3635249A successfully refreshed from Google Patents.
US3635249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selector valves and seals therefor
Assignee: Rolls Royce Power Engineering PLC
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Filing: 1970-01-30
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Granted: 1972-01-18
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Expires: 1990-01-30
Abstract
Abstract The spool of a selector valve of the spool-type is provided with sealing means in the form of at least one annular washer of plastic or elastomeric material which is clamped between two parts of the spool body and is so dimensioned relatively to the latter as to project outwardly therefrom to provide a flexible annular sealing flap encircling the spool body. The sealing flap is capable of limited flexing movement under the action of fluid or liquid pressure the arrangement being such that with fluid or liquid acting in one direction along the spool the sealing flap will perform no sealing function while when the direction of fluid or liquid pressure is reversed said flap will be urged into an operative position wherein it will sealingly engage the inner surface of the bore in the valve body in which the spool is axially movable.
Inventors
- 👤 Douglas Frederick Kirkman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:48
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/8671; Y10T137/86879
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
A selector valve of the spool type comprising a. a valve body having an inner wall surface defining a bore therein b. a valve spool axially movable in said bore and including axially separable parts, and c. at least one flexible annular sealing washer of a plastic or elastomeric material clamped between said axially separable parts and including an annular skirt portion having a frustoconical sealing lip around said valve spool such that fluid pressure acting in one axial direction on said lip tends to press said lip into edge sealing contact with said inner wall surface and fluid pressure acting on said lip in the opposite axial direction tends to deflect said lip out of said sealing contact.
Claim 2
Dependent Claim
119 words
A selector valve of the spool type comprising a. a valve body having an inner wall surface defining a bore therein b. a valve spool axially movable in said bore and including axially separable parts, and c. at least one flexible annular sealing washer of a plastic or elastomeric material clamped between said axially separable parts and including an annular skirt portion having a frustoconical sealing lip around said valve spool such that fluid pressure acting in one axial direction on said lip tends to press said lip into edge sealing contact with said inner wall surface and fluid pressure acting on said lip in the opposite axial direction tends to deflect said lip out of said sealing contact.
Claim 3
Dependent Claim
40 words
A selector valve as claimed in claim 1 wherein said axially separable parts are provided with axially spaced angled support faces and said flexible annular sealing washer is mounted between said axially space angled support faces of the spool parts.
Claim 4
Dependent Claim
44 words
A selector valve as claimed in claim 2 in which said spool comprises a central actuating rod, said axially separable parts being constituted by a plurality of annular collar members assembled on said rod, the sealing washer being clamped between two such collar members.
Claim 5
Dependent Claim
69 words
A selector valve as claimed in claim 3 in which two of said sealing washers are mounted between two adjacent collar members, said valve further comprising an annular spacing element interposed between said washers so that fluid pressure acting in one direction will cause one washer to be effective to provide a seal while fluid pressure acting in the opposite direction will cause the second washer to be operative.
Claim 6
Dependent Claim
41 words
A selector valve as claimed in claim 4 in which each sealing washer is of dished shape, the end faces of the collar members abutting the washer being similarly shaped to conform to, or induce the requisite shape in, the washers.
Claim 7
Dependent Claim
20 words
A selector valve as in claim 5 in which each spacing element includes an outer peripheral portion which is tapered.
Claim 8
Dependent Claim
25 words
A selector valve as claimed in claim 6 comprising additional sealing means interposed between each sealing washer and the members between which it is clamped.
Claim 9
Dependent Claim
41 words
A selector valve as claimed in claim 2 wherein said lip projects beyond the valve spool, said skirt portion which is mounted between the angled support faces of the spool parts being inclined with respect to the axes of the bore.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |