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A system includes an internal combustion engine receiving intake air from an intake manifold and providing exhaust gases to an exhaust manifold. The system further includes an exhaust gas recirculation (EGR) conduit fluidly coupling the exhaust manifold to the intake manifold. The system includes a

A system includes an internal combustion engine receiving intake air from an intake manifold and providing exhaust gases to an exhaust manifold. The system further includes an exhaust gas recirculation (EGR) conduit fluidly coupling the exhaust manifold to the intake manifold. The system includes a conical spring check valve disposed in the EGR conduit, the conical spring check valve having a helically wound spring including a number of turns of decreasing diameter, where each turn progresses axially in a normal flow direction of the EGR from a previous one of the turns. Each of the turns further overlaps a previous one of the turns.

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1. An apparatus, comprising: an engine related gaseous fluid conduit;a conical spring check valve disposed in the engine related gaseous fluid conduit, comprising: a helically wound spring comprising a plurality of turns of decreasing diameter; each of the plurality of turns progresses axially in a

1. An apparatus, comprising: an engine related gaseous fluid conduit;a conical spring check valve disposed in the engine related gaseous fluid conduit, comprising: a helically wound spring comprising a plurality of turns of decreasing diameter; each of the plurality of turns progresses axially in a normal flow direction of the engine related gaseous fluid conduit from a previous one of the plurality of turns, and wherein each of the plurality of turns partially radially overlaps the previous one of the plurality of turns, wherein the helically wound spring comprises a portion of an electrically resistive circuit. 2. The apparatus of claim 1, wherein the engine related gaseous fluid conduit comprises an exhaust gas recirculation (EGR) conduit fluidly coupling an exhaust manifold for an internal combustion engine to an intake manifold of the internal combustion engine. 3. The apparatus of claim 2, wherein the conical spring check valve is positioned on an upstream side of an EGR cooler. 4. The apparatus of claim 3, wherein the conical spring check valve is positioned downstream of an EGR valve. 5. The apparatus of claim 2, wherein the conical spring check valve is positioned downstream of an EGR cooler. 6. The apparatus of claim 5, wherein the conical spring check valve is positioned downstream of an EGR valve. 7. The apparatus of claim 2, wherein the conical spring check valve comprises a first function of an effective flow area versus an EGR flow rate, the apparatus further comprising a valve restriction actuator structured to adjust the conical spring check valve to a second function of the effective flow area versus the EGR flow rate. 8. The apparatus of claim 7, wherein the valve restriction actuator comprises an actuator that provides an axial force to the helically wound spring. 9. The apparatus of claim 2, wherein the conical spring check valve comprises a first function of an effective flow area versus an EGR flow rate, the apparatus further comprising a controller structured to provide electrical power to the electrically resistive circuit to adjust a temperature of the helically wound spring and thereby adjust the conical spring check valve to a second function of the effective flow area versus the EGR flow rate. 10. The apparatus of claim 1, further comprising a controller structured to provide electrical power to the electrically resistive circuit to maintain a temperature of the helically wound spring above a condensation temperature. 11. The apparatus of claim 1, further comprising a controller structured to provide electrical power to the electrically resistive circuit to periodically raise a temperature of the helically wound spring above a cleaning temperature. 12. A system, comprising: an internal combustion engine including an intake manifold adapted to receive intake air and an exhaust manifold adapted to receive exhaust gas;an exhaust gas recirculation (EGR) conduit fluidly coupling the exhaust manifold to the intake manifold;a conical spring check valve disposed in the EGR conduit, the conical spring check valve comprising: a helically wound spring including a plurality of turns of decreasing diameter; andwherein each of the plurality of turns progresses axially in a normal flow direction of the EGR from a previous one of the plurality of turns, and wherein each of the plurality of turns at least partially radially overlaps the previous one of the plurality of turns, and wherein the helically wound spring comprises a portion of an electrically resistive circuit. 13. The system of claim 12, further comprising a power actuator structured to provide electrical power to the electrically resistive circuit in response to a spring heating command. 14. The system of claim 13, further comprising a controller including: a condensation determination module structured to determine a condensation temperature value; anda spring heating module structured to provide the spring heating command to the power actuator in response to the condensation temperature value. 15. The system of claim 13, further comprising a controller including: a cleaning determination module structured to determine a valve cleaning indicator; anda spring heating module structured to provide the spring heating command to the power actuator in response to the valve cleaning indicator. 16. The system of claim 12, wherein the conical spring check valve comprises a first function of an effective flow area versus an EGR flow rate, the system further comprising a controller including: a valve response module structured to determine a valve response target value; andan effective flow function modification module structured to provide an effective flow adjustment command in response to the valve response target value. 17. The system of claim 16, further comprising a valve restriction actuator structured to adjust the conical spring check valve to a second function of the effective flow area versus the EGR flow rate in response to the effective flow adjustment command. 18. The system of claim 16, the system further comprising a power actuator structured to provide electrical power to the electrically resistive circuit to adjust a temperature of the helically wound spring and thereby adjust the conical spring check valve to a second function of the effective flow area versus the EGR flow rate in response to the effective flow adjustment command. 19. An apparatus, comprising: an exhaust gas recirculation (EGR) conduit fluidly coupling an exhaust manifold for an internal combustion engine to an intake manifold of the internal combustion engine;a conical spring check valve disposed in the EGR conduit, the conical spring check valve comprising: a helically wound spring comprising a plurality of turns of decreasing diameter;wherein each of the plurality of turns progresses axially in a normal flow direction of the EGR from a previous one of the plurality of turns, and wherein each of the plurality of turns at least partially radially overlaps the previous one of the plurality of turns; andwherein the conical spring check valve comprises a function of an effective flow area versus an EGR flow rate, wherein the conical spring check valve comprises a portion of an electrically resistive circuit operable to adjust the function of the effective flow area versus the EGR flow rate.