US3554222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic flow control valve
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1969-06-03
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Granted: 1971-01-12
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Expires: 1989-06-03
Abstract
Abstract An automatic flow control valve is made up of a housing forming a valve chamber and a separate piston cylinder with a valve axially positionable within the valve chamber and piston cylinder for maintaining the outlet flow rate at a constant level regardless of any pressure changes in the liquid being supplied to the valve. The valve has a frustoconically shaped section positioned within a similarly shaped part of the valve chamber so that as the valve is displaced there are no significant changes in the cross-sectional area of the flow passageway of the liquid through the valve which could cause cavitation or vortical flow. An adjustable throttle valve, positionable between a fully opened and fully closed position, is located at the outlet from the valve. The housing has several passageways for supplying pressurized liquid to various locations within the valve chamber and the piston cylinder to regulate the position of the valve within the housing.
Inventors
- 👤 Shiso Kihara
- 👤 Hiroshi Nosaka
- 👤 Takuji Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:00
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B11/04; F15B11/05; F15B21/00; F15B21/04; F15B21/047; G; G05; G05D; G05D7/00; G05D7/01; G05D7/0126; F15B2211/00; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/465; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7788
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
344 words
An automatic flow control valve comprising a valve housing forming an axially extending valve chamber and a separate piston cylinder arranged in alignment therewith, an axially extending part of the valve chamber having a frustoconicaily shaped throat section, a spool valve having a valve part positioned within the valve chamber and an extension part positioned within the piston cylinder, said spool valve being slidably positionable within the valve chamber and the piston cylinder, said valve part comprising an axially extending frustoconical section with the frustoconical section with the surface thereof and the surface of the throat section in said valve chamber being disposed at approximately the same angle to the axis of the valve chamber and the frustoconical surfaces of each being spaced apart forming a annular flow passageway of variable width therebetween in dependence on the position of said valve within the valve chamber, a transverse surface on said valve part adjacent the larger diameter end of said frustoconical part, said extension part extending from said valve part into the piston cylinder, said extenSion part comprising a piston positioned within and axially displaceable through the piston cylinder, means for biasing said spool valve in the opening direction, said housing having an inlet passageway therein adjacent the smaller diameter end of the throat section of said valve chamber for supplying a pressurized fluid to the annular passageway about the frustoconically shaped part of the valve, said housing having an outlet passageway extending from the larger diameter end of the throat section of said valve chamber for discharging pressurized fluid after its passage through the annular passageway, an adjustable throttle valve positioned in said outlet passageway, and a secondary inlet passageway within said valve housing communicating at one end with said inlet passageway and at its opposite end with the portion of said valve chamber containing said transverse surface for supplying pressurized fluid thereto for acting against the transverse surface and counteracting the forces of said pressurized fluid acting on the conically shaped part of said valve and directing said valve in the opening direction.
Claim 2
Dependent Claim
344 words
An automatic flow control valve comprising a valve housing forming an axially extending valve chamber and a separate piston cylinder arranged in alignment therewith, an axially extending part of the valve chamber having a frustoconicaily shaped throat section, a spool valve having a valve part positioned within the valve chamber and an extension part positioned within the piston cylinder, said spool valve being slidably positionable within the valve chamber and the piston cylinder, said valve part comprising an axially extending frustoconical section with the frustoconical section with the surface thereof and the surface of the throat section in said valve chamber being disposed at approximately the same angle to the axis of the valve chamber and the frustoconical surfaces of each being spaced apart forming a annular flow passageway of variable width therebetween in dependence on the position of said valve within the valve chamber, a transverse surface on said valve part adjacent the larger diameter end of said frustoconical part, said extension part extending from said valve part into the piston cylinder, said extenSion part comprising a piston positioned within and axially displaceable through the piston cylinder, means for biasing said spool valve in the opening direction, said housing having an inlet passageway therein adjacent the smaller diameter end of the throat section of said valve chamber for supplying a pressurized fluid to the annular passageway about the frustoconically shaped part of the valve, said housing having an outlet passageway extending from the larger diameter end of the throat section of said valve chamber for discharging pressurized fluid after its passage through the annular passageway, an adjustable throttle valve positioned in said outlet passageway, and a secondary inlet passageway within said valve housing communicating at one end with said inlet passageway and at its opposite end with the portion of said valve chamber containing said transverse surface for supplying pressurized fluid thereto for acting against the transverse surface and counteracting the forces of said pressurized fluid acting on the conically shaped part of said valve and directing said valve in the opening direction.
Claim 3
Dependent Claim
128 words
An automatic flow control valve, as set forth in claim 1, wherein said piston on said spool valve divides the piston cylinder into a pair of variable volume chambers, a first auxiliary outlet passageway communicating at one end with said outlet passageway upstream from said throttle valve and at the other end with one of said chambers in said piston cylinder for supplying pressurized fluid thereto for urging said piston in the closing direction of said valve, and a second auxiliary outlet passageway communicating at one end with said outlet passageway downstream from said throttle valve and at the other end with the other one of said chambers in said piston cylinder for supplying pressurized fluid thereto for urging said piston in the opening direction of said valve.
Claim 4
Dependent Claim
57 words
An automatic flow control valve, as set forth in claim 1, wherein a stationary throttle valve being positioned in said auxiliary inlet passageway at the entrance to the end portion of said valve chamber containing the enlarged end of said valve member, and a second stationary throttle valve being located at the outlet from said end portion.
Claim 5
Dependent Claim
48 words
An automatic flow control valve, as set forth in claim 1, wherein said valve chamber having a cylindrically shaped section extending axially from the larger diameter end of said frustoconical section, said transverse surface of said valve being located within the cylindrically shaped section of said valve chamber.
Claim 6
Dependent Claim
44 words
An automatic flow control valve, as set forth in claim 4, wherein said valve comprising a cylindrically shaped part extending axially from the larger diameter end of said frustoconically shaped part and being located within the cylindrically shaped end section of said valve chamber.
Claim 7
Dependent Claim
64 words
An automatic flow control valve, as set forth in claim 5, wherein said cylindrically shaped part of said valve having an axially extending hollow recess therein extending inwardly from the transverse end surface thereof toward said frustoconical part, and a projection on said housing arranged to extend axially inwardly into the valve chamber and being disposed within the hollow recess for guiding said valve.
Claim 8
Dependent Claim
68 words
An automatic flow control valve, as set forth in claim 6, wherein said hollow recess having a diameter substantially equal to the diameter of the smaller end of said frustoconical part, and an opening extending through said valve member communicating between the upstream end of said outlet passageway and said hollow recess for supplying pressurized fluid from the upstream end of said outlet passageway into said hollow recess.
Claim 9
Dependent Claim
44 words
An automatic flow control valve, as set forth in claim 1, wherein said valve having a cylindrically shaped connector part extending between said frustoconical part and said piston extending through the opening in said housing formed between the valve chamber and the piston cylinder.
Claim 10
Dependent Claim
43 words
An automatic flow controL valve, as set forth in claim 1, wherein said means for biasing said valve comprising a spring member within the chamber in the piston cylinder on the side of said piston for urging said valve in the opening direction.
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |