EP0599486A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A reverse flush gas valve
Assignee: Alstom Power UK Holdings Ltd
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Filing: 1993-10-27
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Granted: —
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Expires: 2013-10-27
Abstract
Abstract A gas valve which has provision for a reverse flow pulse of high pressure gas. The valve includes a reservoir (53) which is loaded with high pressure gas during normal operation which is released into the main flow path by an applied pressure reduction. The valve is fitted to a porous ceramic "candle" filter (1) between dirty (D) and clean (C) gas zones. The high pressure gas pulse reverses flow through the filter (1) and blows off any aggregated dirt. A shut-off valve (43) is arranged to shut the valve in the event the ceramic filter (1) breaks. The valve is efficient and uses only a metered amount of high pressure gas with little loss of pressure between supply and flushing.
Inventors
- 👤 Eric Edward Royle
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 16:55
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/2407; B01D46/66; B01D46/70; B01D46/71; B01D46/42; B01D46/4272; B01D46/44; B01D46/46; B01D2265/00; B01D2265/04; B01D2265/05; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4252
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
108 words
A reverse flush gas valve for providing normal gas flow in one direction and pulsed high pressure gas flow in the reverse direction, the valve comprising a chamber (21) having entry and exit ports (35, 27) arranged to be open alternatively, a reservoir (53) connected to said chamber (21) through the entry port (35), means for filling the reservoir with high pressure gas while the entry port is closed to obtain a metered volume of high pressure gas, and means for closing the exit port (27) opening the entry port (35) and exposing the chamber (21) to the metered volume of high pressure gas in the reservoir (53).
Claim 2
Dependent Claim
108 words
A reverse flush gas valve for providing normal gas flow in one direction and pulsed high pressure gas flow in the reverse direction, the valve comprising a chamber (21) having entry and exit ports (35, 27) arranged to be open alternatively, a reservoir (53) connected to said chamber (21) through the entry port (35), means for filling the reservoir with high pressure gas while the entry port is closed to obtain a metered volume of high pressure gas, and means for closing the exit port (27) opening the entry port (35) and exposing the chamber (21) to the metered volume of high pressure gas in the reservoir (53).
Claim 3
Dependent Claim
26 words
A valve according to Clai m 1, wherein said means for filling the reservoir (53) is such as to effect closure of said entry port (35).
Claim 4
Dependent Claim
26 words
A valve according to Clai m 1, wherein said means for filling the reservoir (53) is such as to effect closure of said entry port (35).
Claim 5
Dependent Claim
34 words
A valve according to Claim 2, wherein said entry port (35) and said exit port (27) are adapted to be closed and opened respectively by piston means (29) subject to said high pressure gas.
Claim 6
Dependent Claim
46 words
A valve according to Claim 3, including a control port (33) providing access to the reservoir (53) for high pressure gas, the reservoir (53) being sealed from the control port (33) by said piston means (29), except for a bleed path by-passing the piston means (29).
Claim 7
Dependent Claim
103 words
A valve according to Claim 4, and comprising a cylindrical housing (15), a coaxial hollow cylinder (17) slidable axially within the housing (15) and enclosing said chamber (21), the reservoir (53) being formed between the housing (15) and the hollow cylinder (17), the hollow cylinder (17) being slidable in one direction to open the entry port (35) and close the exit port (27) and in the other direction to close the entry port (35) and open the exit port (27), the hollow cylinder (17) having external circumferential piston means which engages the housing (45) and substantially closes one end of the reservoir (53).
Claim 8
Dependent Claim
77 words
A valve according to Claim 5, wherein one end of the hollow cylinder (17) is adapted to engage the housing (7) to provide the closed condition of the entry port (35), the exit port (27) being provided by one or more holes in a portion of the housing wall (19) in which said hollow cylinder (17) is a sliding fit, said holes being exposed by movement of said hollow cylinder (17) to close the entry port (35).
Claim 9
Dependent Claim
41 words
A valve according to Claim 6, including shut-off means (43,45,47) for said exit port (27), said shut-off means (43,45,47) being biased to close the exit port (27) subject to inhibiting means (1) dependent on the physical integrity of said chamber (21).
Claim 10
Dependent Claim
72 words
A valve according to Claim 7, wherein said shut-off means comprises a cylindrical plug (43) which is slidably mounted in said portion (19) of the housing wall and is operable to fall under gravity to a position in which said exit port (27) is closed, the cylindrical plug (43) being prevented from falling under gravity by a member (45) which is supported by the remote wall (1) of the chamber (21 ).
Claim 11
Dependent Claim
77 words
A valve according to Claim 7, wherein said shut-off means comprises a cylindrical plug (43) which is slidably mounted in said portion (19) of the housing wall and is operable to move under spring bias, in any orientation of the valve, to a position in which said exit port (27) is closed, the cylindrical plug (43) being prevented from moving under said spring bias by a member which is supported by the remote wall of the chamber.
Claim 12
Dependent Claim
37 words
A valve according to Claim 8 or Claim 9, wherein said member omprises a rod (45) which extends from said plug (43) axially through said hollow cylinder (17) to said remote wall (1) of the chamber (21).
Claim 13
Dependent Claim
24 words
Valve according to any of Claims 7, 8, 9 and 10, wherein said chamber (21) is formed partly by a frangible filter member (1).
Claim 14
Dependent Claim
26 words
A valve according to Claim 11 as appendent to Claim 8 wherein said remote wall of the chamber (21) is provided by said filter member (1).
Claim 15
Dependent Claim
19 words
A valve according to Claim 12, wherein the filter member (1) is of tubular form closed at one end.
Claim 16
Dependent Claim
44 words
A valve according to Claim 10 or to any of Claims 11, 12 and 13 as appendent to Claim 10, wherein said rod (45) is weighted (47) at its end adjacent said remote wall to assist movement of said cylindrical plug (43) under gravity.
Claim 17
Dependent Claim
52 words
A valve according to any of Claims 5-14 wherein said hollow cylinder (17) provides a heat conduction path whereby high pressure gas in said reservoir (53) is heated by gas in said chamber (21) while said entry port (35) is closed, to avoid thermal shock to any vulnerable part of said chamber.
Claim 18
Dependent Claim
111 words
A reverse flushing gas filter system including a valve according to any of Claims 11 to 14, means for applying high pressure gas to said control port (33) to fill the reservoir (53) with high pressure gas by way of said bleed path, means responsive to gas pressure in the reservoir (53) to vent the high pressure gas from the control port (33) to cause said piston means (29) to drive said hollow cylinder (17) to open said entry port (35) and close said exit port (27), thereby exposing said chamber (21) and said filter member (1) to a pulse of high pressure gas effective to reverse flush the filter means.
Claim 19
Dependent Claim
49 words
Agas filter system according to Claim 16, including means for supplying high pressure gas to said control port (33) and venting said control port (33) alternately in response to differential gas pressure thresholds, whereby to apply a series of high pressure gas pulses to reverse flush the filter means.
References Cited (Backward Citations)
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