US3628561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve structure for extruders
Assignee: Millennium Petrochemicals Inc
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Filing: 1969-12-17
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Granted: 1971-12-21
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Expires: 1989-12-17
Abstract
Abstract A servosystem for the valve of a plastic extruder wherein the valve is connected to a fluid pressure means operated from a source of constant pressure; the system includes gauge means for ascertaining the pressure of extrudate passing through said valve and flow control valve means associated with said gauge means and said constant pressure means, said flow control valve means being responsive to any variation in extrudate pressure, as indicated by said gauge means, for automatically adjusting the pressure of said constant pressure means to correct any variation from a predetermined pressure.
Inventors
- 👤 Herbert O Corbett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:45
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92019; B29C2948/92314; B29C2948/92323; B29C2948/92466; B29C2948/92504; B29C2948/92514; B29C2948/9258; B29C2948/926; B29C2948/92609; B29C2948/92619; B29C2948/92809; B29C2948/92819; B29C2948/92857; B29C2948/92904; B29C2948/92961; B29C48/03; B29C48/09; B29C48/10; Y; Y10; Y10T; Y10T137/00; Y10T137/6198; Y10T137/6253; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7768; Y10T137/7781; Y10T137/7793; Y10T137/7796
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
281 words
A static valve for controlling the flow of a fluid material; said static valve including a shank portion terminating at a first end thereof in an enlarged head portion; a valve seat adjacent said enlarged head portion; a shank support means for receiving said shank portion in axially sliding relationship; control means associated with said shank portion for adjustably moving said shank portion in an axial direction to control the spacing between said enlarged head portion and said valve seat; said enlarged head portion defining a conically shaped head having its apex facing away from said valve seat, the sides of said conically shaped head forming an angle on the order of 45* with respect to the longitudinal axis of said valve; said control means including fluid pressure means for axially moving said shank portion in a direction toward said valve seat; pressure sensing means for measuring the pressure of a fluid material upstream of said enlarged head portion; constant pressure means for generating fluid pressure against the extremity of said shank portion which is remote from said enlarged head portion; connecting means connecting said constant pressure means to the interior of said fluid pressure means; flow control valve means for controlling the application of pressure from said constant pressure means to said fluid pressure means; and connecting means from said pressure sensing means to said flow valve means to open and close said flow valve means responsive to variation in pressure between the pressures of said fluid material and said constant pressure means, whereby the enlarged valve head portion will be retained at an axial position so as to maintain the pressure of said fluid material at a predetermined level.
Claim 2
Dependent Claim
281 words
A static valve for controlling the flow of a fluid material; said static valve including a shank portion terminating at a first end thereof in an enlarged head portion; a valve seat adjacent said enlarged head portion; a shank support means for receiving said shank portion in axially sliding relationship; control means associated with said shank portion for adjustably moving said shank portion in an axial direction to control the spacing between said enlarged head portion and said valve seat; said enlarged head portion defining a conically shaped head having its apex facing away from said valve seat, the sides of said conically shaped head forming an angle on the order of 45* with respect to the longitudinal axis of said valve; said control means including fluid pressure means for axially moving said shank portion in a direction toward said valve seat; pressure sensing means for measuring the pressure of a fluid material upstream of said enlarged head portion; constant pressure means for generating fluid pressure against the extremity of said shank portion which is remote from said enlarged head portion; connecting means connecting said constant pressure means to the interior of said fluid pressure means; flow control valve means for controlling the application of pressure from said constant pressure means to said fluid pressure means; and connecting means from said pressure sensing means to said flow valve means to open and close said flow valve means responsive to variation in pressure between the pressures of said fluid material and said constant pressure means, whereby the enlarged valve head portion will be retained at an axial position so as to maintain the pressure of said fluid material at a predetermined level.
Claim 3
Dependent Claim
29 words
The valve assembly as set forth in claim 1 which further includes means for continuously rotating said shank portion and said enlarged head portion about the longitudinal axis thereof.
Claim 4
Dependent Claim
72 words
The valve assembly as set forth in claim 2 wherein said fluid pressure means includes a cylinder having a piston therein; one surface of said piston being connected to said shank portion at the extremity thereof remote from said enlarged head portion; and the connecting means between the interior of said fluid pressure means and said constant pressure means is located on the side of said piston remote from said shank portion.
Claim 5
Dependent Claim
226 words
A static valve for controlling the flow of a fluid material; said static valve including a shank portion and an enlarged head portion; a valve seat adjacent said enlarged head portion; a shank support means for receiving said shank portion in axially sliding relationship; fluid pressure means for axially moving said shank portion in an axial direction to control the spacing between said enlarged head portion and said valve seat; pressure sensing means for measuring the pressure of a fluid material upstream of said enlarged head portion; constant pressure means for generating pressure in said fluid pressure means whereby said valve is urged toward a closed position; connecting means from said constant pressure means to the interior of said fluid pressure means; flow control valve means for controlling the application of pressure from said constant pressure means to said fluid pressure means; and connecting means from said pressure sensing means to said flow control valve means to indicate variation in pressure between the pressures of said fluid material and said constant pressure means so as to open and close said flow valve means responsive to any such pressure variation and thereby regulate the pressure applied by said constant pressure means whereby the enlarged valve head will be retained at an axial position so as to maintain the pressure of said fluid material at a predetermined level.
Claim 6
Dependent Claim
226 words
A static valve for controlling the flow of a fluid material; said static valve including a shank portion and an enlarged head portion; a valve seat adjacent said enlarged head portion; a shank support means for receiving said shank portion in axially sliding relationship; fluid pressure means for axially moving said shank portion in an axial direction to control the spacing between said enlarged head portion and said valve seat; pressure sensing means for measuring the pressure of a fluid material upstream of said enlarged head portion; constant pressure means for generating pressure in said fluid pressure means whereby said valve is urged toward a closed position; connecting means from said constant pressure means to the interior of said fluid pressure means; flow control valve means for controlling the application of pressure from said constant pressure means to said fluid pressure means; and connecting means from said pressure sensing means to said flow control valve means to indicate variation in pressure between the pressures of said fluid material and said constant pressure means so as to open and close said flow valve means responsive to any such pressure variation and thereby regulate the pressure applied by said constant pressure means whereby the enlarged valve head will be retained at an axial position so as to maintain the pressure of said fluid material at a predetermined level.
Claim 7
Dependent Claim
29 words
The valve assembly as set forth in claim 4 which further includes means for continuously rotating said shank portion and said enlarged head portion about the longitudinal axis thereof.
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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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |