US3753547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid valves
Assignee: TEXICON Ltd
•
Filing: 1972-03-22
•
Granted: 1973-08-21
•
Expires: 1992-03-22
Abstract
Abstract The invention concerns valves of the type for downwardly delivering liquid from a liquid store and which comprise a valve body bearing an annular valve seat and a circular closure member, the closure member and the valve body being relatively displaceable for opening and closing of the valve. In order for the valve operation to be substantially drip-free, the lowermost rim of the valve body and the lowermost rim of the closure member each comprise a respective knife edge which, when the valve seat and closure member are in their closed position, mate together to define a composite, depending knife edge.
Inventors
- 👤 M Topham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:56
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/42; F16K1/36; F16K1/38; F16K1/385; F16K23/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
93 words
A valve for downwardly delivering liquid from a liquid store, comprising a valve body, means defining an annular valve seat on the valve body, a circular closure member, means for relatively displacing the closure member and the valve body for opening and closing of the valve, means defining a respective knife edge on the lowermost rim of the valve body and the lowermost rim of the closure member which, when the valve seat and closure member are in their closed position, are arranged to mate together to define a composite, depending knife edge.
Claim 2
Dependent Claim
93 words
A valve for downwardly delivering liquid from a liquid store, comprising a valve body, means defining an annular valve seat on the valve body, a circular closure member, means for relatively displacing the closure member and the valve body for opening and closing of the valve, means defining a respective knife edge on the lowermost rim of the valve body and the lowermost rim of the closure member which, when the valve seat and closure member are in their closed position, are arranged to mate together to define a composite, depending knife edge.
Claim 3
Dependent Claim
22 words
A valve according to claim 1 in which said valve seat is formed adjacent said knife edge defined on the valve body.
Claim 4
Dependent Claim
92 words
A valve according to claim 2 in which the closure member comprises a cylindrical body which is closed at its upper end, the valve body has a cylindrical bore for slidably receiving said cylindrical body of the closure member in an intermediate and closed position of the valve, and means defining at least one vertically extending slot in the peripheral surface of the body of the closure member for the restricted passage of liquid in the intermediate position of the valve when said closure member body is partially inserted into said bore.
Claim 5
Dependent Claim
81 words
A valve according to claim 3 in which the lowermost rim of the valve body bears the valve seat on its inner face, and the lowermost rim of said cylindrical body of the closure member engages the valve seat in the closed position of the valve to shut off the flow of liquid through said slots, both said rims being of acute angled section, and the mating surfaces of the valve body and closure member both being of inverted, frusto-conical configuration.
Claim 6
Dependent Claim
37 words
A valve according to claim 4 in which said lowermost rim of the valve body is located on an annular, inwardly directed, tapered lip formed on the valve body at the lower end of said cylindrical bore.
Claim 7
Dependent Claim
28 words
A valve according to claim 5 in which the mating surfaces of the valve body and closure member each subtend an angle of substantially 45* to the horizontal.
Claim 8
Dependent Claim
30 words
A valve according to claim 6 in which the underside of the lip on the valve body bearing the valve seat subtends an angle of substantially 35* to the horizontal.
Claim 9
Dependent Claim
30 words
A valve according to claim 1 further comprising a rod attached to the valve closure member and means for axially displacing the rod for opening and closing of the valve.
Claim 10
Dependent Claim
35 words
A valve according to claim 8 in which the rod is adapted to be pneumatically displaced for opening and closing of the valve, the rod passing out of the valve body via a liquid-tight seal.
Claim 11
Dependent Claim
26 words
A valve according to claim 1 in which the vAlve body is constructed of stainless steel and the closure member is constructed of a plastics material.
Claim 12
Dependent Claim
138 words
A valve for downwardly delivering liquid from a liquid store comprising a valve body, means defining a circular bore in the valve body, a hollow circular plug of the general shape of an inverted cup, means enabling said plug to be raised and lowered relative to said cylindrical bore in the valve body, at least one vertical slot in the external surface of said plug for the restricted passage of liquid in an intermediate position of the valve, and means defining an acute angled, inverted cone-shaped lip on the valve body, the rim of the plug being of acute angled section around its edge, and being adapted to seat against said acute angled, inverted cone-shaped lip on the valve body, to shut off the flow of liquid through the slots when the valve is in its closed position.
Claim 13
Dependent Claim
138 words
A valve for downwardly delivering liquid from a liquid store comprising a valve body, means defining a circular bore in the valve body, a hollow circular plug of the general shape of an inverted cup, means enabling said plug to be raised and lowered relative to said cylindrical bore in the valve body, at least one vertical slot in the external surface of said plug for the restricted passage of liquid in an intermediate position of the valve, and means defining an acute angled, inverted cone-shaped lip on the valve body, the rim of the plug being of acute angled section around its edge, and being adapted to seat against said acute angled, inverted cone-shaped lip on the valve body, to shut off the flow of liquid through the slots when the valve is in its closed position.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |