US4616477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic servomotor
Assignee: Sulzer AG
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Filing: 1985-07-02
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Granted: 1986-10-14
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Expires: 2005-07-02
Abstract
Abstract The servomotor is constructed with a cylinder and a surrounding pressure tank with a construction formed of a plurality of radial grooves through which air can be throttled during an emergency closing of a valve. The constriction is formed with a flow resistance equivalent to a free cross-sectional area of not more than 0.02D 2 ; D being the inside diameter of the cylinder. The spherical pressure tank may be secured about a cup-shaped cylinder to form the pressurized chamber while radial grooves in a flange of the cylinder form a constriction with a cover secured to the cylinder and spherical tank.
Inventors
- 👤 Markus Baumeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:50
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/122; F01; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/14; F01D17/141; F01D17/145; F16K47/00; F05; F05D; F05D2200/00; F05D2200/20; F05D2200/22; F05D2200/221
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
214 words
A pneumatic servomotor comprising a cover; a cup-shaped cylinder secured to said cover at an open end thereof, said cylinder having a predetermined inside diameter and a plurality of radial grooves at said open end defining apertures having a flow resistance to a given rate of flow or air passing therethrough equivalent to a free cross-sectional area not more than 0.02 times the square of said inside diameter; a piston slidably mounted in said cylinder to move between a lowered position spaced from said open end to define a first chamber between said cover and said piston and a raised position adjacent a closed end of said cylinder; a piston rod secured to said piston and passing through said cover, said rod having a bore communicating an upper end face of said piston with the exterior of said cover; a part-spherical pressure tank secured to said cover about said cylinder to define a second chamber therewith, said chamber being in communication with said first chamber through said radial grooves in said cylinder; means including a first control valve for controlling a flow of pressurized medium from a source into said second chamber; and means including a second control valve for controlling a flow of medium from said second chamber to a pressure medium sink.
Claim 2
Dependent Claim
214 words
A pneumatic servomotor comprising a cover; a cup-shaped cylinder secured to said cover at an open end thereof, said cylinder having a predetermined inside diameter and a plurality of radial grooves at said open end defining apertures having a flow resistance to a given rate of flow or air passing therethrough equivalent to a free cross-sectional area not more than 0.02 times the square of said inside diameter; a piston slidably mounted in said cylinder to move between a lowered position spaced from said open end to define a first chamber between said cover and said piston and a raised position adjacent a closed end of said cylinder; a piston rod secured to said piston and passing through said cover, said rod having a bore communicating an upper end face of said piston with the exterior of said cover; a part-spherical pressure tank secured to said cover about said cylinder to define a second chamber therewith, said chamber being in communication with said first chamber through said radial grooves in said cylinder; means including a first control valve for controlling a flow of pressurized medium from a source into said second chamber; and means including a second control valve for controlling a flow of medium from said second chamber to a pressure medium sink.
Claim 3
Dependent Claim
195 words
A pneumatic servomotor for a valve comprising a cylinder having an inside diameter (D); a piston slidably mounted in said cylinder to move between a raised position adjacent one end face of said cylinder and a lowered position spaced from the opposite end face of said cylinder to define a first chamber therewith; a piston rod secured to said piston and extending through said first chamber and said opposite end face for connection to a load outside said cylinder; means defining a second chamber about said cylinder for selectively receiving a pressurized medium, said second chamber having a volume larger than the volume of said first chamber; a constriction communicating said first chamber with said second chamber to throttle a flow of pressurized medium therethrough, said constriction having a flow cross-sectional area (F id ) of not more than F id =0.02 D 2 ; a first control valve for controlling a flow of pressurized medium to said second chamber; a second control valve for controlling a flow of medium from said second chamber; and a means communicating a chamber between said piston and said one end of said cylinder with a pressure medium sink.
Claim 4
Dependent Claim
195 words
A pneumatic servomotor for a valve comprising a cylinder having an inside diameter (D); a piston slidably mounted in said cylinder to move between a raised position adjacent one end face of said cylinder and a lowered position spaced from the opposite end face of said cylinder to define a first chamber therewith; a piston rod secured to said piston and extending through said first chamber and said opposite end face for connection to a load outside said cylinder; means defining a second chamber about said cylinder for selectively receiving a pressurized medium, said second chamber having a volume larger than the volume of said first chamber; a constriction communicating said first chamber with said second chamber to throttle a flow of pressurized medium therethrough, said constriction having a flow cross-sectional area (F id ) of not more than F id =0.02 D 2 ; a first control valve for controlling a flow of pressurized medium to said second chamber; a second control valve for controlling a flow of medium from said second chamber; and a means communicating a chamber between said piston and said one end of said cylinder with a pressure medium sink.
Claim 5
Dependent Claim
56 words
A pneumatic servomotor as set forth in claim 2 wherein said means defining said second chamber includes a pressure tank over and about said cylinder and a cover secured to said tank and said cylinder and wherein said constriction includes a plurality of radial grooves in said cylinder in facing relation to and adjacent said cover.
Claim 6
Dependent Claim
204 words
An pneumatic servomotor for a valve comprising a cylinder having an inside diameter (D) and a pair of end faces; a piston slidably mounted in said cylinder to move between a first position adjacent one end face of said cylinder and a second position spaced from said one end face to define a first chamber therewith; a piston rod secured to said piston and extending through the other end face of said cylinder for connection to a valve outside said cylinder; means about said cylinder to define a second chamber with said cylinder, said second chamber having a volume larger than the volume of said first chamber; a first control valve for controlling a flow of pressurized medium to said second chamber; a second control valve for controlling a flow of medium from said second chamber; a constriction communicating said first chamber with said second chamber to throttle a flow of pressurized medium from said second chamber into said first chamber, said constriction having a flow cross-sectional area (F id ) of not more than (F id =0.02 D 2 ); and an aperture communicating a third chamber between said piston and said one end face of said cylinder with a pressure medium sink.
Claim 7
Dependent Claim
204 words
An pneumatic servomotor for a valve comprising a cylinder having an inside diameter (D) and a pair of end faces; a piston slidably mounted in said cylinder to move between a first position adjacent one end face of said cylinder and a second position spaced from said one end face to define a first chamber therewith; a piston rod secured to said piston and extending through the other end face of said cylinder for connection to a valve outside said cylinder; means about said cylinder to define a second chamber with said cylinder, said second chamber having a volume larger than the volume of said first chamber; a first control valve for controlling a flow of pressurized medium to said second chamber; a second control valve for controlling a flow of medium from said second chamber; a constriction communicating said first chamber with said second chamber to throttle a flow of pressurized medium from said second chamber into said first chamber, said constriction having a flow cross-sectional area (F id ) of not more than (F id =0.02 D 2 ); and an aperture communicating a third chamber between said piston and said one end face of said cylinder with a pressure medium sink.
Claim 8
Dependent Claim
26 words
A pneumatic servomotor as set forth in claim 4 which further comprises a pressure tank connected with said first control valve to supply pressurized medium thereto.
Claim 9
Dependent Claim
41 words
A servomotor as set forth in claim 4 wherein said piston defines a sub-chamber in said second position and wherein said piston has a stroke which displaces a volume less than the combined volumes of said second chamber and said sub-chamber.
Claim 10
Dependent Claim
29 words
A servomotor as set forth in claim 6 wherein said sub-chamber has a volume not more than 10% of the total volume of said second chamber and said sub-chamber.
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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) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |