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An exhaust treatment device for a combustion system is disclosed. The exhaust treatment device may have a housing, and an injector disposed within the housing to deliver an injection fluid into a flow of exhaust. The exhaust treatment device may also have at least one fluid supply passage that is di

An exhaust treatment device for a combustion system is disclosed. The exhaust treatment device may have a housing, and an injector disposed within the housing to deliver an injection fluid into a flow of exhaust. The exhaust treatment device may also have at least one fluid supply passage that is disposed within the housing and being in fluid communication with the injector to supply the injector with injection fluid. The exhaust treatment device may further have at least one purge passage disposed within the housing and in fluid communication with the injector to supply the injector with a purge fluid. The exhaust treatment device may additionally have a first valve element that is mounted to the housing and disposed at an entrance of the at least one purge passage The first valve element may be configured to provide a unidirectional flow of purge fluid to the at least one purge passage.

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1. An exhaust treatment device, comprising: a housing;an injector disposed within the housing to deliver an injection fluid into a flow of exhaust;at least one fluid supply passage disposed within the housing and being in fluid communication with the injector to supply the injector with injection fl

1. An exhaust treatment device, comprising: a housing;an injector disposed within the housing to deliver an injection fluid into a flow of exhaust;at least one fluid supply passage disposed within the housing and being in fluid communication with the injector to supply the injector with injection fluid;at least one purge passage disposed within the housing and being in fluid communication with the injector to supply the injector with a purge fluid; anda first valve element mounted to the housing and being disposed at an entrance of the at least one purge passage, the entrance of the purge passage being formed by a periphery of the housing, and the first valve element being configured to provide a unidirectional flow of purge fluid to the at least one purge passage, wherein the at least one purge passage is in fluid communication with the injector via the at least one fluid supply passage, and the at least one fluid supply passage includes a pilot supply passage and a main supply passage. 2. The exhaust treatment device of claim 1, wherein an upstream side of the first valve element is only exposed to purge fluid, and a downstream side of the first valve element is periodically exposed to injection fluid and purge fluid. 3. The exhaust treatment device of claim 1, wherein a pressure of the injection fluid in the pilot supply passage is almost always greater than a pressure of the injection fluid in the main supply passage. 4. The exhaust treatment device of claim 1, wherein the at least one purge passage branches to a pilot purge passage in fluid communication with the pilot supply passage, and to a main purge passage in fluid communication with the main supply passage, and the first valve element is disposed upstream of the pilot and main purge passages. 5. The exhaust treatment device of claim 4, further including a second valve element disposed within the pilot purge passage to allow a flow of purge fluid into the pilot supply passage, to prevent a flow of injection fluid from the pilot supply passage into the pilot purge passage, and to prevent a flow of injection fluid from the pilot purge passage into the pilot supply passage. 6. The exhaust treatment device of claim 5, wherein the second valve element is fixedly connected to the housing. 7. The exhaust treatment device of claim 4, wherein the pilot purge passage is oriented substantially orthogonal to the main purge passage. 8. The exhaust treatment device of claim 4, wherein the pilot and main purge passages are each periodically filled with injection fluid and purge fluid. 9. The exhaust treatment device of claim 1, wherein the first valve element is removably connected to an entrance port of the housing. 10. The exhaust treatment device of claim 9, further including an adapter fixedly receiving the first valve element and being removably connected to the entrance. 11. The exhaust treatment device of claim 9, wherein the adapter is corrosion resistant. 12. The exhaust treatment device of claim 1, wherein the at least one purge passage branches to a pilot purge passage in fluid communication with a pilot supply passage, and a main purge passage in fluid communication with a main supply passage, the exhaust treatment device further including a second valve element disposed within the pilot purge passage, the second valve element regulating flow into and out of the pilot supply passage. 13. A method of operating an exhaust treatment device, comprising: supplying injection fluid to the exhaust treatment device, the supply of injection fluid comprising a pilot flow of injection fluid and a main flow of injection fluid;preventing the pilot flow of injection fluid from joining the main flow of injection fluid, and preventing any of the main flow of injection fluid from joining the pilot flow of injection fluid;separately supplying purge fluid to the exhaust treatment device in parallel relation to the supply of injection fluid;ensuring, with a valve disposed at an entrance to the exhaust treatment device, a unidirectional flow of the supply of purge fluid into the exhaust treatment device; andallowing the unidirectional flow of the supply of purge fluid to branch, downstream of the valve, to a pilot flow of purge fluid directed to force the pilot flow of injection fluid from the exhaust treatment device, and to a main flow of purge fluid directed to force the main flow of injection fluid from the exhaust treatment device. 14. The method of claim 13, wherein all purge fluid within the exhaust treatment device is periodically replaced with injection fluid. 15. The method of claim 13, further including directing the pilot flow of injection fluid and the main flow of injection fluid into the exhaust treatment device in parallel relation. 16. The method of claim 15, wherein a pressure of the pilot flow of injection fluid is almost always greater than a pressure of the main flow of injection fluid. 17. An exhaust treatment system configured to receive a flow of exhaust, comprising: a particulate trap configured to remove particulates from the flow of exhaust; anda regeneration device configured to periodically initiate regeneration of the particulate trap, the regeneration device including: a supply of fuel;a supply of purge air;an injector configured to selectively inject fuel into the flow of exhaust; anda housing disposed to receive in parallel, fluid fuel and air from the supplies of fuel and purge air and being configured to house the injector, the housing including: a pilot supply passage fluidly communicating the supply of fuel with the injector;a main supply passage fluidly communicating the supply of fuel with the injector at a pressure lower than the pressure of fuel within the pilot supply passage;a purge passage fluidly communicating the supply of purge air with the pilot and main supply passages; anda first check valve mounted to the housing at an inlet purge port formed by a periphery of the housing between the supply of purge air and the purge passage, the first check valve being configured to provide a unidirectional flow of purge air into the housing. 18. The exhaust treatment system of claim 17, wherein an upstream side of the first check valve is only exposed to purge air, and a downstream side of the first check valve is periodically exposed to fuel and purge air. 19. The exhaust treatment system of claim 17, wherein the purge passage branches to a pilot purge passage in fluid communication with the pilot supply passage, and to a main purge passage in fluid communication with the main supply passage, wherein the first check valve is disposed upstream of the pilot and main purge passages. 20. The exhaust treatment system of claim 19, further including a second check valve disposed within the pilot purge passage to allow a flow of purge air into the pilot supply passage and to prevent a flow of fuel from the pilot purge passage into the pilot supply passage. 21. The exhaust treatment system of claim 20, wherein the second check valve also prevents a flow of fuel from the pilot supply passage into the main supply passage via the pilot and main purge passages. 22. The exhaust treatment system of claim 20, wherein the second check valve is fixedly connected to the housing. 23. The exhaust treatment system of claim 19, wherein the pilot and main purge passages are each periodically filled with fuel. 24. The exhaust treatment system of claim 17, further including an adapter fixedly receiving the first check valve and being removably connected to the to the inlet purge port. 25. The exhaust treatment system of claim 24, wherein the adapter is corrosion resistant. 26. The exhaust treatment device of claim 17, wherein the purge passage branches to a pilot purge passage in fluid communication with the pilot supply passage, and to a main purge passage in fluid communication with the main supply passage, the exhaust treatment device further including a second check valve disposed within the pilot purge passage, the second check valve regulating flow into and out of the pilot supply passage.