Abstract: An exhaust gas heat exchanger comprising an external shell (20) extending between two tube plates (30, 31) and defining a coolant chamber; internal tubes (38) forming exhaust gas passages which extend between the tube plates (30, 31); an exhaust gas manifold divided by a baffle plate (29) into first and second chambers (26, 28) with an exhaust gas inlet (25) and outlet (27) respectively. The baffle plate (29) is provided with a valve (51) which can be operated between an open position, which exhaust gas flows along the cooling tubes (38), and a closed position, in which exhaust gas is diverted directly from the first chamber (26) to the second chamber (28).

Abstract: An exhaust gas recirculation cooler (1) with a coolant chamber (14), a bypass tube (50) and means (70) to selectively direct exhaust gas through the coolant chamber (14) or bypass tube (50). The bypass tube (50) may be used to direct hot exhaust gases to the engine under low engine temperature/load operating conditions and during start up of the engine; the coolant chamber (14) may be used to cool very hot gases under high engine temperature/load conditions and direct the cooled gas to the engine. The bypass tube (50) is integrally formed with the coolant chamber, reducing space required for the cooler and making for easier installation.

Abstract: An exhaust gas recirculation cooler (1) with a coolant chamber (14), a bypass tube (50) and means (70) to selectively direct exhaust gas through the coolant chamber (14) or bypass tube (50). The bypass tube (50) may be used to direct hot exhaust gases to the engine under low engine temperature/load operating conditions and during start up of the engine; the coolant chamber (14) may be used to cool very hot gases under high engine temperature/load conditions and direct the cooled gas to the engine. The bypass tube (50) is integrally formed with the coolant chamber, reducing space required for the cooler and making for easier installation.

Abstract: An exhaust gas heat exchanger comprising an external shell (20) extending between two tube plates (30, 31) and defining a coolant chamber; internal tubes (38) forming exhaust gas passages which extend between the tube plates (30, 31); an exhaust gas manifold divided by a baffle plate (29) into first and second chambers (26, 28) with an exhaust gas inlet (25) and outlet (27) respectively. The baffle plate (29) is provided with a valve (51) which can be operated between an open position, in which exhaust gas flows along the cooling tubes (38), and a closed position, in which exhaust gas is diverted directly from the first chamber (26) to the second chamber (28).