US4437493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant flow control valve
Assignee: Oval Engineering Co Ltd
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Filing: 1982-08-18
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Granted: 1984-03-20
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Expires: 2002-08-18
Abstract
Abstract This invention relates to a constant flow control valve comprising a main flow passage whose area is variable by fluctuation of a fluid dynamic pressure, thus permitting a constant flow rate and a by-pass passage which is mounted along an external periphery of the main flow passage, has a by-pass valve opening whose area can be varied as the area of the main flow passage is varied, and is closed and sealed, thus being made to be unusable as necessary.
Inventors
- 👤 Kuniteru Okuda
- 👤 Jun Morita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
G; G05; G05D; G05D7/00; G05D7/01; G05D7/0126; G05D7/0133; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7792
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
A constant flow control valve, which comprises: a valve body formed with a chamber; a cylindrically-shaped sleeve member disposed in said chamber and defining a by-pass passage therebetween, said sleeve member being provided with at least one aperature in fluid communication with said by-pass passage; a needle rod co-axially disposed within said sleeve member to define a main flow passage; a cylindrically-shaped piston-type body including a main flow orifice slidably disposed within said sleeve member; a spring member disposed within said chamber of said control valve and acting on said piston-type body for balancing fluid dynamic pressure thereon; and a selectively removable regulator plate means laterally-disposed within said chamber on said sleeve member and over said by-pass passage to permit adjustment of said control valve to a given constant flow rate.
Claim 2
Dependent Claim
131 words
A constant flow control valve, which comprises: a valve body formed with a chamber; a cylindrically-shaped sleeve member disposed in said chamber and defining a by-pass passage therebetween, said sleeve member being provided with at least one aperature in fluid communication with said by-pass passage; a needle rod co-axially disposed within said sleeve member to define a main flow passage; a cylindrically-shaped piston-type body including a main flow orifice slidably disposed within said sleeve member; a spring member disposed within said chamber of said control valve and acting on said piston-type body for balancing fluid dynamic pressure thereon; and a selectively removable regulator plate means laterally-disposed within said chamber on said sleeve member and over said by-pass passage to permit adjustment of said control valve to a given constant flow rate.
Claim 3
Dependent Claim
36 words
The constant flow control valve as defined in claim 1 wherein said regulator plate includes at least one opening thereby permitting variation of an open area of said by-pass passage at said given constant flow rate.
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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) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |