US3734455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for a fluid cylinder valve actuator
Assignee: Cooper Industries LLC
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Filing: 1971-09-21
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Granted: 1973-05-22
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Expires: 1991-09-21
Abstract
Abstract A remotely controlled fluid pressure actuator has a valve stem extending through the actuator cylinder and a threaded projection on the top of the cylinder. The cylinder has venting ports adapted to be closed by an O-ring when the latter is pressed down by a sleeve on the threaded projection. An auxiliary override for local operation of the valve is adapted to be connected to the threaded projection in place of the sleeve. The auxiliary override cannot be screwed down far enough to hold the O-ring closed, so that the cylinder is vented to prevent remote operation of the valve while the auxiliary override is attached and necessitating removal of the auxiliary override before the actuator can again be placed in normal service.
Inventors
- 👤 P Natho
- 👤 F Vicari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:53
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/14; F16K31/143; F16K31/122; F16K31/1221
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
A valve structure comprising a gate valve; a stem connected to the gate valve; a remotely controlled fluid actuator including a cylinder and a piston in said cylinder connected to said stem for movement of the gate valve; an externally threaded projection on said cylinder in axial alignment with the stem and having a central bore receiving the stem, vent means for the cylinder positioned adjacent said projection and communicating with atmosphere, releasable means for closing said vent means to prevent the venting of the cylinder; a removable override for the fluid actuator for selective positioning on said threaded projection and engagement with said stem for actuating the gate valve, said override when in operative position on said threaded projection permitting venting of the cylinder through said vent means whereby said remotely controlled fluid actuator is inoperative; and a separate attachment removably secured to said threaded projection upon removal of said override engaging said releasable means and closing said vent means thereby to render operative said remotely controlled fluid actuator.
Claim 2
Dependent Claim
170 words
A valve structure comprising a gate valve; a stem connected to the gate valve; a remotely controlled fluid actuator including a cylinder and a piston in said cylinder connected to said stem for movement of the gate valve; an externally threaded projection on said cylinder in axial alignment with the stem and having a central bore receiving the stem, vent means for the cylinder positioned adjacent said projection and communicating with atmosphere, releasable means for closing said vent means to prevent the venting of the cylinder; a removable override for the fluid actuator for selective positioning on said threaded projection and engagement with said stem for actuating the gate valve, said override when in operative position on said threaded projection permitting venting of the cylinder through said vent means whereby said remotely controlled fluid actuator is inoperative; and a separate attachment removably secured to said threaded projection upon removal of said override engaging said releasable means and closing said vent means thereby to render operative said remotely controlled fluid actuator.
Claim 3
Dependent Claim
110 words
A valve structure comprising, a gate valve, a stem connected to the gate valve, a remotely controlled fluid actuator including a cylinder and a piston in said cylinder connected to said stem for movement of the gate valve, a projection on said cylinder in axial alignment with the stem and having a central bore receiving the stem, vent means for the cylinder positioned adjacent said projection and communicating with atmosphere, releasable means for closing said vent means to prevent the venting of the cylinder, and a separate attachment removably secured to said projection engaging said releasable means to close said vent means thereby rendering operative said remotely controlled fluid actuator.
Claim 4
Dependent Claim
110 words
A valve structure comprising, a gate valve, a stem connected to the gate valve, a remotely controlled fluid actuator including a cylinder and a piston in said cylinder connected to said stem for movement of the gate valve, a projection on said cylinder in axial alignment with the stem and having a central bore receiving the stem, vent means for the cylinder positioned adjacent said projection and communicating with atmosphere, releasable means for closing said vent means to prevent the venting of the cylinder, and a separate attachment removably secured to said projection engaging said releasable means to close said vent means thereby rendering operative said remotely controlled fluid actuator.
Claim 5
Dependent Claim
23 words
A valve structure as set forth in claim 2 wherein said releasable means includes a compressible ring arranged to close the vent means.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |