Patent US3818921A successfully refreshed from Google Patents.
US3818921A
Expired / Lapsed
US
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Fluid flow throttling valve
Assignee: Bendix Corp
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Filing: 1972-09-15
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Granted: 1974-06-25
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Expires: 1992-09-15
Abstract
Abstract A fluid pressure responsive poppet type flow throttling valve having a wide range of flow control and provided with relatively large areas exposed to control fluid pressures. The valve is spring loaded by two springs one of which is active in part range flow control only. The valve is contoured to provide a predetemined valve area vs valve travel to provide gain control and/or a predetermined flow range. In addition to the above, other structural features including an adjustable stop to control minimum valve flow area serve to minimize undesirable characteristics such as instability, excessive droop and/or reliabliity.
Inventors
- 👤 J Peczkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:19
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/10; G05D16/101; G05D16/028; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7788; Y10T137/7793; Y10T137/7801
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
163 words
Fluid flow control apparatus comprising: a conduit including a flow orifice for conducting pressurized fluid from a source to a receiver; valve means operatively connected to said flow orifice for varying the effective flow area thereof; a fluid chamber; fluid pressure responsive means including a fluid pressure responsive member slidably carried in said chamber and operatively connected to said valve means for actuating the same; first passage means including a damping restriction for conducting a variable control pressurized fluid to said chamber; said fluid pressure responsive member being exposed on one side to said pressurized fluid in said conduit and on an opposite side to said control pressurized fluid in said chamber; said control pressurized fluid being at a relatively lower pressure; an annular recess in said fluid pressure responsive member for receiving leakage of fluid between adjacent surfaces of said member and said chamber; and second passage means connecting said annular recess with said first passage means upstream from said damping restriction.
Claim 2
Dependent Claim
163 words
Fluid flow control apparatus comprising: a conduit including a flow orifice for conducting pressurized fluid from a source to a receiver; valve means operatively connected to said flow orifice for varying the effective flow area thereof; a fluid chamber; fluid pressure responsive means including a fluid pressure responsive member slidably carried in said chamber and operatively connected to said valve means for actuating the same; first passage means including a damping restriction for conducting a variable control pressurized fluid to said chamber; said fluid pressure responsive member being exposed on one side to said pressurized fluid in said conduit and on an opposite side to said control pressurized fluid in said chamber; said control pressurized fluid being at a relatively lower pressure; an annular recess in said fluid pressure responsive member for receiving leakage of fluid between adjacent surfaces of said member and said chamber; and second passage means connecting said annular recess with said first passage means upstream from said damping restriction.
Claim 3
Dependent Claim
126 words
Fluid flow control apparatus as claimed in claim 1 and further including: a fixed spring retaining member extending into said chamber and defining a fixed closed end of said chamber; a stop member adjustably secured to said spring retaining member and engaged by said fluid pressure responsive member to limit movement of said fluid pressure responsive member in a direction to close said valve means; and first and second concentric compression springs interposed between respective first and second portions of said stop member and said fluid pressure responsive member for loading said fluid pressure responsive member in a direction to open said valve means; said first compression spring being rendered inoperative to load said fluid pressure responsive member at a predetermined position of said valve means.
Claim 4
Dependent Claim
87 words
Fluid flow control apparatus as claimed in claim 2, wherein: said valve means is provided with first and second annular tapered surfaces adapted which cooperate with said orifice to vary the effective flow area thereof; said first and second annular tapered surfaces having different angles of taper to thereby establish a variable orifice area vs valve travel relationship over a first range of travel of said valve means and a second orifice area vs valve travel relationship over a second range of travel of said valve means.
Claim 5
Dependent Claim
71 words
Fluid flow control apparatus as claimed in claim 1, wherein: said valve means is responsive to the fluid pressure in said conduit downstream from said orifice which acts in opposition to said control fluid pressure; said vaLve means being operative to maintain a pressure differential between said control fluid pressure and said pressure downstream from said orifice in accordance with the force load derived from said first and second compression springs.
Claim 6
Dependent Claim
58 words
Fluid flow control apparatus as claimed in claim 1, wherein: said valve means is responsive to the fluid pressure in said conduit upstream from said orifice and urged in an opening direction in opposition to the fluid pressure in said conduit upstream from said orifice acting against said fluid pressure responsive member thereby providing a corresponding force balance.
Claim 7
Dependent Claim
27 words
Fluid flow control apparatus as claimed in claim 2, and further including: second adjustable stop means for limiting movement of said valve means in an opening direction.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |