US4742987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve
Assignee: Azbil Corp
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Filing: 1987-04-28
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Granted: 1988-05-10
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Expires: 2007-04-28
Abstract
Abstract A valve having a flow path in the form of a Venturi tube having a throttle and flow path sections extending and flaring from the opposite sides of the throttle to an inlet and outlet, respectively, and a cylindrical valve plug provided at the throttle and selectively movable at right angles to the flow path to present a flow path end into the flow path and having a semi-spherical valve head at the flow path end with a notch having a length in the direction of movement of the valve plug less than the diameter of the throttle formed in a portion of the valve head and the remaining portion of the valve head containing a diametrical line connecting opposite portions of the valve head in contact with the wall of the throttle while occupying a major portion of the surface of the valve head facing a flow in the flow path.
Inventors
- 👤 Shozo Kanamori
- 👤 Shigehiro Kawai
- 👤 Seiji Yamaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:07
CPC Classifications
F; F16; F16K; F16K3/00; F16K3/22; F16K3/24; F16K3/30; F16K3/314
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
236 words
A valve comprising a flow path in the form of a Venturi tube having a throttle and flow path sections flaring from the opposite sides of said throttle to an inlet and outlet, respectively, a plug guide means attached to said throttle by a fluid-tight seal and having a uniform diameter internal bore for guiding a cylindrical plug and for providing a fluid-tight seal with the plug during an entire movement of the plug in said guide means and a cylindrical uniform diameter plug provided in said throttle and said bore in said guide means and selectively movable at right angles to said flow path, said cylindrical plug having an end in said flow path with a semi-spherical valve head with a notch formed in a portion of said valve head to provide a surface at the bottom of said notch normal to the axial direction of said flow and having a length starting at an end of said valve head in said flow path which is less than the diameter of said throttle section while occupying a major portion of the surface of said valve head facing a flow in said flow path whereby a flow rate stabilization in said flow path is produced by said notch in said valve head by eliminating an inversion in the flow rate during opening and closing operations of the valve to provide a reliable and precise flow quantity.
Claim 2
Dependent Claim
236 words
A valve comprising a flow path in the form of a Venturi tube having a throttle and flow path sections flaring from the opposite sides of said throttle to an inlet and outlet, respectively, a plug guide means attached to said throttle by a fluid-tight seal and having a uniform diameter internal bore for guiding a cylindrical plug and for providing a fluid-tight seal with the plug during an entire movement of the plug in said guide means and a cylindrical uniform diameter plug provided in said throttle and said bore in said guide means and selectively movable at right angles to said flow path, said cylindrical plug having an end in said flow path with a semi-spherical valve head with a notch formed in a portion of said valve head to provide a surface at the bottom of said notch normal to the axial direction of said flow and having a length starting at an end of said valve head in said flow path which is less than the diameter of said throttle section while occupying a major portion of the surface of said valve head facing a flow in said flow path whereby a flow rate stabilization in said flow path is produced by said notch in said valve head by eliminating an inversion in the flow rate during opening and closing operations of the valve to provide a reliable and precise flow quantity.
Claim 3
Dependent Claim
35 words
A valve as set forth in claim 1 wherein the remaining portion of said valve head contains a diametrical line connecting opposite portions of said valve head in contact with the wall of said throttle.
Claim 4
Dependent Claim
20 words
A valve as set forth in claim 1 wherein said notch is formed on one side of said valve head.
Claim 5
Dependent Claim
21 words
A valve as set forth in claim 3 wherein said notch is formed on an upstream side of said valve head.
Claim 6
Dependent Claim
21 words
A valve as set forth in claim 3 wherein said notch is formed on a downstream side of said valve head.
Claim 7
Dependent Claim
23 words
A valve as set forth in claim 1 wherein said notch is formed on the upstream and downstream side of said valve head.
Claim 8
Dependent Claim
17 words
A valve as set forth in claim 6 wherein said upstream and downstream notches are substantially identical.
Claim 9
Dependent Claim
18 words
A valve as set forth in claim 6 wherein said upstream and downstream notches are different in configuration.
Claim 10
Dependent Claim
37 words
A valve as set forth in claim 1 wherein said notch has a width in an axial direction of the flow path through said Venturi tube which is less than one-half of the diameter of said plug.
Claim 11
Dependent Claim
30 words
A valve as set forth in claim 9 wherein the length of the notch in an axial direction of said plug is greater than one-half the diameter of said plug.
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) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |