US3770011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tank vent and product valve system
Assignee: Knappco Corp
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Filing: 1973-02-05
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Granted: 1973-11-06
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Expires: 1993-02-05
Abstract
Abstract A vent and product valve system for tanker trucks and the like. Prior to opening of the product valve the vent valve is automatically opened by a system whose operation is based in part upon spring loading and differential pressure areas in the valves. Filling pressure alone is insufficient to operate the product valve, enabling a plurality of product valves to be connected in parallel and sequentially operated to provide sequential filling of associated tanks. The power unit for operating each product valve is completely isolated from the product in the tank so that the valve components are not damaged by the product.
Inventors
- 👤 H Muchl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:10
CPC Classifications
F; F16; F16K; F16K27/00; F16K27/07; F16K24/00; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86292; Y10T137/86324
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
344 words
A tank vent and product valve system for a tanker truck or the like, said system comprising: a vent valve including a guide assembly for fixed attachment to the tank and defining a vent port for venting the tank interior; a vent cover carried by said guide assembly for movement thereon between a closed position shutting said vent port and an open position opening said vent port, said vent cover having a first pressure responsive means engageable on one side with said guide assembly defining a chamber on the opposite side; and first bias means positioned to exert a first bias urging said vent cover toward said closed position; a product valve including a valve body for attachment to the tank and defining a product port for communication with the tank interior; a valve cap mounted to said valve body and defining an annular product valve passage with said flange; a product piston carried by said valve body for movement between a closed position shutting said product port and an open position opening said product port; and second bias means positioned to exert a second bias urging said product piston toward said closed position; a power valve mounted to said valve body and including a power piston; a second pressure responsive means on one side with said power piston and defining a chamber on the opposite side; and third bias means positioned to exert a third bias urging said power piston inwardly; linkage means engageable by said power piston to move said product piston to said open position; and means for applying fluid under pressure to said chambers of said vent and product valves to urge said vent cover and said power piston against the bias of said first and third bias means, respectively, to open said vent port and said product port, the effective pressure area of said first pressure responsive means being greater than the effective pressure area of said second pressure responsive means whereby the same level of fluid pressure effects opening of said vent port prior to said product port.
Claim 2
Dependent Claim
344 words
A tank vent and product valve system for a tanker truck or the like, said system comprising: a vent valve including a guide assembly for fixed attachment to the tank and defining a vent port for venting the tank interior; a vent cover carried by said guide assembly for movement thereon between a closed position shutting said vent port and an open position opening said vent port, said vent cover having a first pressure responsive means engageable on one side with said guide assembly defining a chamber on the opposite side; and first bias means positioned to exert a first bias urging said vent cover toward said closed position; a product valve including a valve body for attachment to the tank and defining a product port for communication with the tank interior; a valve cap mounted to said valve body and defining an annular product valve passage with said flange; a product piston carried by said valve body for movement between a closed position shutting said product port and an open position opening said product port; and second bias means positioned to exert a second bias urging said product piston toward said closed position; a power valve mounted to said valve body and including a power piston; a second pressure responsive means on one side with said power piston and defining a chamber on the opposite side; and third bias means positioned to exert a third bias urging said power piston inwardly; linkage means engageable by said power piston to move said product piston to said open position; and means for applying fluid under pressure to said chambers of said vent and product valves to urge said vent cover and said power piston against the bias of said first and third bias means, respectively, to open said vent port and said product port, the effective pressure area of said first pressure responsive means being greater than the effective pressure area of said second pressure responsive means whereby the same level of fluid pressure effects opening of said vent port prior to said product port.
Claim 3
Dependent Claim
28 words
A tank vent and product valve system according to claim 1 wherein said first pressure responsive means and said second pressure responsive means each comprise a flexible diaphragm.
Claim 4
Dependent Claim
45 words
A tank vent and product valve system according to claim 1 wherein said vent cover includes sealing means engaged upon said guide assembly in said closed position of said vent cover and preventing the product in said tank from reaching said first pressure responsive means.
Claim 5
Dependent Claim
30 words
A tank vent and product valve system according to claim 1 wherein said last-mentioned means comprise a compressed air line parallel-connected to said chambers of said vent and product valves.
Claim 6
Dependent Claim
75 words
A tank vent and product valve system according to claim 1 and including a first seal engaged between said product piston and said valve cap in said closed position of said product piston and defining a first effective pressure area; and a second seal engaged between said product piston and said valve body in said closed position of said product piston and defining a second effective pressure area less than said first effective pressure area.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |