US4360039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valves
Assignee: SCANFLOW AS
•
Filing: 1980-11-19
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Granted: 1982-11-23
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Expires: 2000-11-19
Abstract
Abstract A leakproof valve has a valve housing which consists of an upper portion and a lower portion each connectable to a conduit. Between these portions there is a communication which has a conical valve seat with two sealing rings of different diameters. Two outer cone parts in a three-way divided valve cone cooperate with the sealing rings of the valve seat for forming double seals betwen the upper and lower portions of the valve housing. The third cone part is located between and movable with respect to the two oute cone parts. On closure of the communication, the third cone part will substantially abut against the seat between the sealing rings such that no cavity is formed here. A subsequent shifting of the third cone part with respect to the two outer cone parts opens a communication from the region between the seals to a bleeder outlet.
Inventors
- 👤 Hakan E. O. Jeppsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:15
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/36; F16K1/38; F16K1/385; F16K1/44; F16K1/443; F16K1/446; F16K25/00; F16K37/00; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4259; Y10T137/8593; Y10T137/87917; Y10T137/87981; Y10T137/88022; Y10T137/8803; Y10T137/88046
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
A leak-proof valve comprising a housing having an upper portion, a lower portion and a valve seat defining an axial passage therebetween; two valve heads axially movable with respect to the valve seat between a closed position in which the valve heads bear against spaced-apart ring portions of the valve seat, and an open position in which the valve heads are axially cleared from the valve seat, said valve heads being axially spaced apart to define a leakage cavity therebetween; a bleeder outlet connected to the leakage cavity; a third valve head axially movable within the leakage cavity and configured to conform to the valve seat surface between the two ring portions thereof; and means for moving the third valve head for opening a communication from a region between the two ring portions of the valve seat to the bleeder outlet first after the two valve heads are moved into the closed position, and for closing said communication before the two valve heads are moved toward the open position.
Claim 2
Dependent Claim
169 words
A leak-proof valve comprising a housing having an upper portion, a lower portion and a valve seat defining an axial passage therebetween; two valve heads axially movable with respect to the valve seat between a closed position in which the valve heads bear against spaced-apart ring portions of the valve seat, and an open position in which the valve heads are axially cleared from the valve seat, said valve heads being axially spaced apart to define a leakage cavity therebetween; a bleeder outlet connected to the leakage cavity; a third valve head axially movable within the leakage cavity and configured to conform to the valve seat surface between the two ring portions thereof; and means for moving the third valve head for opening a communication from a region between the two ring portions of the valve seat to the bleeder outlet first after the two valve heads are moved into the closed position, and for closing said communication before the two valve heads are moved toward the open position.
Claim 3
Dependent Claim
23 words
A leak-proof valve as defined in claim 1, wherein said two valve heads are designed as two parts of a cone or piston.
Claim 4
Dependent Claim
34 words
A leak-proof valve as defined in claim 2, wherein said third valve head is designed as a third part of the cone or piston disposed between said two parts of the cone or piston.
Claim 5
Dependent Claim
27 words
A leak-proof valve as defined in claim 3, wherein the valve seat and the valve cone parts conically taper in the closure direction of the valve cone.
Claim 6
Dependent Claim
16 words
A leak-proof valve as defined in claim 1, wherein the two valve heads are mutually movable.
Claim 7
Dependent Claim
25 words
A leak-proof valve as defined in claim 5, further comprising a single air cylinder with a plurality of spring-biased pistons for operating the valve heads.
Claim 8
Dependent Claim
34 words
A leak-proof valve as defined in claim 6, wherein two of the pistons have directions of movement which are opposed to one another and opposed to their respective spring bias, on compressed air actuation.
Claim 9
Dependent Claim
47 words
A leak-proof valve as defined in claim 8, wherein the pistons have piston surfaces of different sizes, and the piston of the smaller piston surface is more weakly spring-biased than, and has a restricted length of travel with respect to, the piston having the larger piston surface.
References Cited (Backward Citations)
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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) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |