US4589627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure medium actuated valve
Assignee: Sulzer AG
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Filing: 1985-01-28
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Granted: 1986-05-20
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Expires: 2005-01-28
Abstract
Abstract The pressure-medium-actuated valve has a pressure medium inlet, a pressure medium outlet and a cylinder. A piston which is connected to a lid is movable in the cylinder and subdivides the cylinder into a first piston chamber and a second piston chamber. Two relief lines, each comprising a control valve are connected to the piston chambers and extend to a pressure medium sink. A first connecting line comprising a control valve extends from the inlet to the first piston chamber and a second connecting line comprising a control valve extends from the inlet to the second piston chamber. A third connecting line is disposed in the wall of the valve body and extends at one end into the first connecting line. The other end of the third connecting line is connected to the cylinder at a place which, with the piston in the operative position, extends into the second piston chamber and, with the piston in the safety position, extends into the first piston chamber.
Inventors
- 👤 Karlheinz Grotloh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:46
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/363
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
336 words
A pressure medium actuated valve comprising a casing having a valve chamber, an inlet for conveying a pressure medium to said chamber, an outlet for conveying pressure medium from said chamber and a cylinder sealingly spaced from said chamber; a piston movably mounted in said cylinder to divide said cylinder into a first piston chamber which enlarges upon movement of said piston from an operative position to a safety position within said cylinder and a second piston chamber which decreases upon said piston movement; a rod extending from said piston into said valve chamber; a lid mounted on said rod within said valve chamber for closing said outlet from said valve chamber; at least one spring in said cylinder biasing said piston towards said safety position; a first relief line extending from said first piston chamber to a pressure medium sink; a first control valve in said first relief line for controlling a flow of pressure medium therethrough; a second relief line extending from said second piston chamber to a pressure medium sink; a second control valve in said second relief line for controlling a flow of pressure medium therethrough; a first connecting line between said valve chamber and said first piston chamber; a third control valve in said first connecting line for controlling a flow of pressure medium therethrough; a second connecting line between said valve chamber and said second piston chamber; a fourth control valve in said second connecting line for controlling a flow of pressure medium therethrough; and a third connecting line having one end connected to a chamber part extending from the cylinder-side end of said third control valve through said first connecting line, said first piston chamber and said first relief line to the cylinder-side end of said first control valve and a second end connected to said casing at a position which communicates with said second piston chamber with said piston in said operative position and which communicates with said first piston chamber with said piston in said safety position.
Claim 2
Dependent Claim
336 words
A pressure medium actuated valve comprising a casing having a valve chamber, an inlet for conveying a pressure medium to said chamber, an outlet for conveying pressure medium from said chamber and a cylinder sealingly spaced from said chamber; a piston movably mounted in said cylinder to divide said cylinder into a first piston chamber which enlarges upon movement of said piston from an operative position to a safety position within said cylinder and a second piston chamber which decreases upon said piston movement; a rod extending from said piston into said valve chamber; a lid mounted on said rod within said valve chamber for closing said outlet from said valve chamber; at least one spring in said cylinder biasing said piston towards said safety position; a first relief line extending from said first piston chamber to a pressure medium sink; a first control valve in said first relief line for controlling a flow of pressure medium therethrough; a second relief line extending from said second piston chamber to a pressure medium sink; a second control valve in said second relief line for controlling a flow of pressure medium therethrough; a first connecting line between said valve chamber and said first piston chamber; a third control valve in said first connecting line for controlling a flow of pressure medium therethrough; a second connecting line between said valve chamber and said second piston chamber; a fourth control valve in said second connecting line for controlling a flow of pressure medium therethrough; and a third connecting line having one end connected to a chamber part extending from the cylinder-side end of said third control valve through said first connecting line, said first piston chamber and said first relief line to the cylinder-side end of said first control valve and a second end connected to said casing at a position which communicates with said second piston chamber with said piston in said operative position and which communicates with said first piston chamber with said piston in said safety position.
Claim 3
Dependent Claim
18 words
A valve as set forth in claim 1 which further comprises a restrictor in said third connecting line.
Claim 4
Dependent Claim
34 words
A valve as set forth in claim 2 which further comprises a second restrictor in said second relief line having at least the same flow cross-section as said restrictor in said third connecting line.
Claim 5
Dependent Claim
18 words
A valve as set forth in claim 1 wherein said third connecting line is disposed in said casing.
Claim 6
Dependent Claim
40 words
A valve as set forth in claim 1 which further comprises a wall part externally connectable to said cylinder and having a part of said third connecting line therein and a restrictor in said part of said third connecting line.
Claim 7
Dependent Claim
34 words
A valve as set forth in claim 5 which further comprises a second restrictor in said second relief line having at least the same flow cross-section as said restrictor in said third connecting line.
Claim 8
Dependent Claim
38 words
A valve as set forth in claim 1 wherein said second end of said third connecting line splits into at least two parallel branches which communicate with said first piston chamber with said piston in said safety position.
References Cited (Backward Citations)
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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) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |