US3727636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow control valve for fuel injection nozzle
Assignee: Parker Hannifin Corp
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Filing: 1971-01-25
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Granted: 1973-04-17
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Expires: 1991-01-25
Abstract
Abstract A flow control (or metering) valve characterized in the provision of a combined pintle-spool type valve member in which the pintle valve portion cooperates with a large diameter seat in the housing so as to require large operating forces which, in turn, minimize the effects of friction and hysteresis losses and in which the adjacent spool valve portion is a close sliding fit in the housing bore and has one or more metering slots formed in its periphery to cooperate with the aforesaid seat to meter the flow through the valve with low gain owing to the metering area being independent of the spool size. The valve herein is further characterized in that the spool metering portion is of relatively short axial length and in that the valve member has an elongated small diameter guide portion which is guided in the housing at a zone spaced a substantial distance from the metering portion and seating portion so as to prevent cocking and sticking of the valve member despite the very close fit between the spool portion and housing bore and a relatively looser fit between the spaced guide portion of the valve member.
Inventors
- 👤 H Simmons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:19
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/44; F02M59/46; F02C; F02C7/00; F02C7/22; F02C7/232; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7931; Y10T137/7932
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
298 words
A flow control valve comprising a housing having an inlet and an outlet and a passage for flow of fluid from said inlet to said outlet; guide means in said housing having axially spaced apart coaxial large and small diameter bores of which the former is several times larger than the latter; a valve member having axially spaced apart large and small portions axially guided in the respective bores; said large portion being of cylindrical form and having at least one peripheral axially extending groove which defines a variable area metering slot with said large bore as said valve member moves axially therein; said large portion being of diameter substantially equal to that of said large bore whereby fluid flows substantially solely through said variable area slot as the fluid pressure in said inlet increases or decreases; said small portion being guided in said small bore but having a greater diametral clearance therewith than said large portion has with said larGe bore; spring means biasing said valve member in a direction tending to decrease the flow area of said slot; said large portion being exposed to fluid pressure in said inlet thus to move said valve member in the opposite direction to increase the flow area of said slot as the force of the fluid pressure in said inlet on said large portion exceeds the biasing force exerted by said spring means, said large portion being of relatively short axial length in relation to the axial spacing of said large and small bores and said large and small portions from each other thus to prevent cocking and sticking of said valve member in said guide means despite such greater diametral clearance between said small portion and said small bore than between said large portion and said large bore.
Claim 2
Dependent Claim
298 words
A flow control valve comprising a housing having an inlet and an outlet and a passage for flow of fluid from said inlet to said outlet; guide means in said housing having axially spaced apart coaxial large and small diameter bores of which the former is several times larger than the latter; a valve member having axially spaced apart large and small portions axially guided in the respective bores; said large portion being of cylindrical form and having at least one peripheral axially extending groove which defines a variable area metering slot with said large bore as said valve member moves axially therein; said large portion being of diameter substantially equal to that of said large bore whereby fluid flows substantially solely through said variable area slot as the fluid pressure in said inlet increases or decreases; said small portion being guided in said small bore but having a greater diametral clearance therewith than said large portion has with said larGe bore; spring means biasing said valve member in a direction tending to decrease the flow area of said slot; said large portion being exposed to fluid pressure in said inlet thus to move said valve member in the opposite direction to increase the flow area of said slot as the force of the fluid pressure in said inlet on said large portion exceeds the biasing force exerted by said spring means, said large portion being of relatively short axial length in relation to the axial spacing of said large and small bores and said large and small portions from each other thus to prevent cocking and sticking of said valve member in said guide means despite such greater diametral clearance between said small portion and said small bore than between said large portion and said large bore.
Claim 3
Dependent Claim
61 words
The valve of claim 1 wherein said small portion is of non-circular cross-section to provide relatively small circumferentially spaced apart contact areas between said small portion and said small bore and to define flow passages between successive contact areas; and wherein said guide means has passages for fluid flow in addition to those between said small bore and said small portion.
Claim 4
Dependent Claim
62 words
The valve of claim 1 wherein said large portion has a further enlarged portion which is seated against the downstream edge of said large bore to prevent flow of fluid through said valve when the force of the fluid pressure in said inlet on said large portion is insufficient to overcome the force exerted on said valve member by said spring means.
Claim 5
Dependent Claim
45 words
The valve of claim 1 wherein said guide means adjacent to said large bore has an abutment shoulder; and said valve member adjacent to said small portion has an abutment member thereon; said spring means being compressed between said abutment shoulder and said abutment member.
Claim 6
Dependent Claim
113 words
The valve of claim 1 wherein the axial length of said large portion is a small minor fractional portion of the axial spacing of said large and small portions and wherein the diametral clearance between said large portion and said large bore is a small minor fractional portion of the diametral clearance between said small portion and said small bore whereby flow of fluid between said large portion and said large bore is substantially prevented except through said metering slot while the relatively larger diametral clearance and the axial spacing of said small and large portions prevents cocking and sticking of said valve member in said guide means by eliminating dresser drawer effect.
References Cited (Backward Citations)
US1206359A
Cited
US1137516A
Cited
US2263197A
Cited
US2574120A
Cited
US2753217A
Cited
US2879794A
Cited
US3022954A
Cited
US3249308A
Cited
US3443760A
Cited
US3568711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |