초록 ▼

An air supply system and valve is disclosed which provides a reverse pulse of air for cleaning a filter element located in a filter house. A valve is also disclosed for use in the air supply system. The system includes a pressure vessel adapted to contain a volume of compressed air to be used for su

An air supply system and valve is disclosed which provides a reverse pulse of air for cleaning a filter element located in a filter house. A valve is also disclosed for use in the air supply system. The system includes a pressure vessel adapted to contain a volume of compressed air to be used for supplying the reverse pulse, the pressure vessel having a wall with at least one outlet aperture therein. The valve is mounted to the wall around the aperture to control the flow of air from the pressure vessel, the valve means comprising a valve body having an inlet, an outlet and a flow passage connecting the inlet and outlet, the inlet, the outlet and the flow passage generally extending axially through the valve body, a valve seat surrounding the flow passage, and a valve closure member movable towards and away from the valve seat into closed and open positions to thereby close or open the flow passage, and operating means for moving the valve closure member between the closed and open positions. A conduit mounted to the valve body around the outlet and adapted to extend into the filter house in use so as to direct a pulse of air towards a filter element to be cleaned when the valve closure member is in the open position.

대표청구항 ▼

The invention claimed is: 1. An air supply system adapted to provide a reverse pulse of air for cleaning a filter element located in a filter house, said system comprising: a pressure vessel adapted to contain a volume of compressed air to be used for supplying said reverse pulse, said pressure ves

The invention claimed is: 1. An air supply system adapted to provide a reverse pulse of air for cleaning a filter element located in a filter house, said system comprising: a pressure vessel adapted to contain a volume of compressed air to be used for supplying said reverse pulse, said pressure vessel having a wall with at least one outlet aperture therein; valve means mounted to said wall around said aperture to control the flow of air from said pressure vessel, said valve means comprising a valve body having an inlet, an outlet and a flow passage connecting the inlet and outlet, said inlet, said outlet and said flow passage generally extending axially through said valve body, a valve seat surrounding said flow passage, and a valve closure member movable towards and away from said valve seat into closed and open positions to thereby close or open said flow passage, and operating means for moving said valve closure member between said closed and open positions; and a conduit mounted to said valve body around said outlet and outside of said pressure vessel, said conduit adapted to extend into said filter house in use so as to direct a pulse of air towards a filter element to be cleaned when said valve closure member is in said open position. 2. An air supply system according to claim 1, wherein the inlet and outlet are in general axial alignment with one another. 3. An air supply system according to claim 1, wherein the valve means further comprises engagement formations adapted to engage said at least one outlet aperture of said pressure vessel, wherein said valve is at least partially within said pressure vessel. 4. An air supply system according to claim 1, wherein the pressure vessel has a volume which exceeds the volume of air required for a reverse pulse of the system. 5. An air supply system according to claim 1, wherein the pressure vessel is a low-pressure system adapted to contain pressure at between 100 and 300 kPa. 6. An air supply system according to claim 5, wherein the pressure vessel is adapted to contain pressure at between 120 kPa and 150 kPa. 7. An air supply system according to claim 1, wherein said pressure vessel is of right circular cylindrical configuration and said aperture has an axis perpendicular to the cylinder axis. 8. An air supply system according to claim 1, wherein the valve body has a mounting flange or shoulder on an outer surface thereof shaped and configured to engage and seal with the outer surface of the pressure vessel surrounding said aperture. 9. An air supply system according to claim 8, wherein the valve means further comprises a clamp arrangement mounted thereto adapted to clamp the valve body to the pressure vessel by engagement with an inner surface of the pressure vessel. 10. An air supply system according to claim 9, wherein the clamp arrangement is operable from a position exterior of the pressure vessel such that the valve body can be mounted to, or removed from, the pressure vessel from said exterior position. 11. An air supply system according to claim 10, wherein the clamp arrangement comprises a substantially C-shaped clamp which is in engagement with a bolt which extends axially through the body, rotation of the bolt causing the C-shaped clamp to move towards and away from the body. 12. An air supply system according to claim 8, wherein the valve includes an internally threaded coupling member adapted to be located within an outlet aperture to engage an inner surface of the pressure vessel, the valve body in use being secured into the coupling member, including engagement formations adapted to engage an inner surface of the pressure vessel, the valve body in use being secured into the coupling member to cause said engagement formations to operatively engage the inner surface to thereby mount the valve to the pressure vessel. 13. An air supply system according to claim 8, wherein the valve closure member includes a poppet valve closure member. 14. An air supply system according to claim 13, wherein the valve closure member is spring biased into a closed position. 15. An air supply system according to claim 13, wherein the poppet valve closure member is axially mounted to a stem having a piston on the distal end thereof, the piston being located in and slideable relative to a cylinder which is fixed relative to and axially aligned with the valve body, said valve closure member being moveable by varying the pressure within said cylinder. 16. An air supply system according to claim 15, wherein the pressure chamber is located on and aligned with the valve axis. 17. An air supply system according to claim 13, wherein the body includes turbulent air flow reducing means in the location of the outlet, said turbulent air flow reducing means being adapted to reduce turbulent flow of air within said outlet m use. 18. An air supply system according to claim 17, wherein the turbulent air flow reducing means includes a shroud or cowl shaped extension on the outlet side of the pressure chamber. 19. An air supply system according to claim 1, wherein the conduit has a constricted end which will serve to increase the velocity of air flow at the outlet. 20. An air supply system according to claim 1, further comprising a tubular bracket for mounting the conduit as it passes through a wall of a filter house, the tubular bracket comprising an elongate tubular body having an internal wall sized to be a close sliding fit with the external surface of the conduit, the tubular body having an external thread thereon adapted to receive a nut for clamping the bracket to a filter house wall in a relatively rigid arrangement. 21. An air supply system according to claim 20, wherein the tubular body has a plurality of tapered catches thereon which are biased outwardly but which have the capacity to flex resiliently inwardly as said bracket is inserted into an aperture through a wall of a filter house, and flex outwardly when the tubular bracket is in position to hold the tubular bracket in position. 22. An air supply system according to claim 1, wherein the valve body is adapted to be coupled to a coupling ring or annular flange for coupling the valve to the pressure vessel, the flange or coupling ring including means for engaging with the pressure vessel, and the valve body including formations adapted to engage with co-operant formations on the flange or coupling ring to mount the valve body to the flange to coupling ring. 23. A valve comprising: a valve body having an inlet, an outlet, and a flow passage connecting the inlet and outlet, said inlet, said outlet and said flow passage generally extending axially through said valve body; a valve seat surrounding the flow passage and a valve closure member moveable towards and away from the valve seat to close and open the valve respectively; the valve closure member comprising: a poppet closure member axially mounted to a stem having a piston on the distal end thereof, the piston being located in and slideable relative to a cylinder which is fixed relative to the valve body, said valve closure member being moveable by varying the pressure within said cylinder, and a pilot conduit extending through said valve body into said cylinder, said pilot conduit adapted to be connected to a source of high pressure fluid for increasing the fluid pressure in said conduit to move said valve closure member away from said valve seat and thereby open said valve. 24. A valve as claimed in claim 23, wherein the inlet and outlet are in general axial alignment with one another. 25. A valve according to claim 23 or claim 24, further comprising engagement formations adapted to engage a wall of a pressure vessel or conduit in use to thereby mount said valve body to said wall in use. 26. A valve according to claim 25, where the engagement formations comprise a rod extending through said valve body, said stem, said piston and said valve closure member, said rod being in general axial alignment with said valve body; and a clamp arrangement mounted to said rod, said clamp arrangement being adapted to clamp said valve to a pressure vessel by engagement with an inner surface of said vessel. 27. A valve according to claim 23 or 24, further comprising a biasing means to bias said valve closure member toward said valve seat. 28. A valve according to claim 27, wherein the biasing means includes a spring provided on said rod and located between said clamp and said valve closure member. 29. A valve according to claim 26, wherein the clamp arrangement comprises a generally C-shaped clamp which is in threaded engagement with a threaded end of said rod, wherein rotation of said rod causes said generally C shaped clamp to move toward and away from said valve body. 30. A valve according to any one of claim 23 or 24, wherein the valve body includes turbulent flow reducing means in the location of said outlet, said turbulent flow reducing means being adapted to reduce turbulent flow of fluid within said outlet in use. 31. A valve according to claim 30, wherein the turbulent flow reducing means includes a shroud or cowl shaped extension on the outlet side of the valve body. 32. A valve according to claim 23, wherein release of said source of high pressure fluid from said pilot conduit decreases the fluid pressure in said conduit to cause said biasing means to bias said valve closure member toward said valve seat and thereby close said valve. 33. A valve according to claim 32, wherein a bleed conduit extends through said piston from said cylinder to said flow passage to allow fluid under pressure in said cylinder to discharge into said flow passage upon release of said source of high pressure fluid. 34. A valve according to claim 29, wherein the generally C shaped clamp is adapted to clamp to an internal wall of a pressure vessel or a conduit for supplying a reverse pulse of air for reverse pulse cleaning of filter elements. 35. A valve according to claim 23, wherein the outlet is connected to a conduit adapted to direct a pulse of air toward one or more filter elements to be cleaned when said valve is open. 36. A valve according to claim 23, wherein the valve body is adapted to be coupled to a coupling ring or annular flange for coupling the valve to a pressure vessel, the annular flange or coupling ring including means for engaging with the pressure vessel, and the valve body includes formations adapted to engage with co-operant formations on the flange or coupling ring to mount the valve body to the flange to coupling ring.