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US3749108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Add-on slide valve for existing piping
Assignee: Gas Technology Institute
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Filing: 1972-04-28
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Granted: 1973-07-31
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Expires: 1992-04-28
Abstract
Abstract The invention comprises a valve stopper which includes, generally, a rubber patch clamp which is used in combination with a slide gate valve assembly, both of which can be added to an existing fluid piping system without shut-down or interruption of flow. The rubber patch clamp first is affixed to the pipe, and then rubber patch clamp and pipe beneath are sawed through with, for example, a hacksaw or other thin blade or carborundum wire blade. As the blade passes through the compressed rubber patch of the clamp, the rubber tends to close around and behind the blade minimizing fluid leakage from the sawn pipe beneath. The pipe is sawn roughly in half, and the blade then is removed. The slide gate of a slide gate valve assembly is extended from its bonnet, extended partly into the sawn slot in the rubber patch clamp and the pipe beneath. Thereafter, the installation is completed by affixing the entire slide gate valve assembly on the pipe, over the rubber patch clamp.
Inventors
- 👤 G Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:15
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/10; F16L55/105; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0402; Y10T137/0441; Y10T137/0486; Y10T137/0491; Y10T137/0514; Y10T137/598; Y10T137/612; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49412
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
179 words
A valve stopper for use with a pipe containing a fluid under moderate pressure comprising, in combination: a rubber patch clamp secured to and extending about the peripheral surface of said pipe, said rubber patch clamp closing around and behind a thin cutting blade means as the latter is used to cut a slot in said pipe to minimize fluid leakage from said slot, a slide gate valve assembly including a valve top portion supporting a movable slide gate of a thickness and configuration to extend through said slot into said pipe and to block passage of fluid through said pipe when disposed therein and a valve bottom portion, said valve top and bottom portions being formed to permit said movable slide gate to be extended partially into and through said slot to locate said movable slide gate therein and to be clamped together about said pipe with said rubber patch clamp enclosed therein, and means for movably operating said slide gate to extend it through said slot in said pipe to cut off the flow of fluid therein.
Claim 2
Dependent Claim
179 words
A valve stopper for use with a pipe containing a fluid under moderate pressure comprising, in combination: a rubber patch clamp secured to and extending about the peripheral surface of said pipe, said rubber patch clamp closing around and behind a thin cutting blade means as the latter is used to cut a slot in said pipe to minimize fluid leakage from said slot, a slide gate valve assembly including a valve top portion supporting a movable slide gate of a thickness and configuration to extend through said slot into said pipe and to block passage of fluid through said pipe when disposed therein and a valve bottom portion, said valve top and bottom portions being formed to permit said movable slide gate to be extended partially into and through said slot to locate said movable slide gate therein and to be clamped together about said pipe with said rubber patch clamp enclosed therein, and means for movably operating said slide gate to extend it through said slot in said pipe to cut off the flow of fluid therein.
Claim 3
Dependent Claim
20 words
The valve stopper of claim 1, wherein said rubber patch clamp comprises a sheet metal covered compressed rubber patch clamp.
Claim 4
Dependent Claim
42 words
The valve stopper of claim 2, wherein said compressed rubber patch portion of said rubber patch clamp extends about at least one-half the peripheral surface of said pipe, and wherein said slot extends about approximately one-half the peripheral surface of said pipe.
Claim 5
Dependent Claim
24 words
The valve stopper of claim 2, wherin said sheet metal covered compressed rubber patch clamp has a pre-sawn slot in the metal portion thereof.
Claim 6
Dependent Claim
22 words
The valve stopper of claim 1, wherein said movable slide gate of said slide gate valve assembly comprises a push-pull slide gate.
Claim 7
Dependent Claim
24 words
The valve stopper of claim 1, wherein said movable slide gate of said slide gate valve assembly comprises a screw shaft type slide gate.
Claim 8
Independent Claim
129 words
A method of installing a valve stopper on a pipe containing a fluid under moderate pressure comprising the steps of: affixing a rubber patch clamp about said pipe, sawing a slot through said rubber patch clamp and through said pipe, said rubber patch clamp closing around and behind the saw blade and minimizing fluid leakage from the sawn pipe beneath, withdrawing the saw blade from said pipe and said rubber patch clamp, extending the slide gate of a slide gate valve assembly through said slot and partially into said pipe, and securing said slide gate valve assembly about said pipe and said rubber patch clamp, whereby said slide gate can be operated to extend it through said slot and into said pipe to stop the passage of fluid therein.
Claim 9
Independent Claim
129 words
A method of installing a valve stopper on a pipe containing a fluid under moderate pressure comprising the steps of: affixing a rubber patch clamp about said pipe, sawing a slot through said rubber patch clamp and through said pipe, said rubber patch clamp closing around and behind the saw blade and minimizing fluid leakage from the sawn pipe beneath, withdrawing the saw blade from said pipe and said rubber patch clamp, extending the slide gate of a slide gate valve assembly through said slot and partially into said pipe, and securing said slide gate valve assembly about said pipe and said rubber patch clamp, whereby said slide gate can be operated to extend it through said slot and into said pipe to stop the passage of fluid therein.
Claim 10
Dependent Claim
47 words
The method of claim 7, further including the steps of setting a valve box about said stopper valve, whereby said stopper valve can be operated from the surface of the ground through said valve box with a valve key, and backfilling about said pipe and valve box.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |