An automotive piston engine has an exhaust gas return system which all important functions within a single housing (1). The components within the unit are an exhaust gas return valve (19), an exhaust gas cooling unit (10) with heat exchanger (15), a by-pas...

A first elongate casing (1) has gas inlet (2) and outlet ports (3) at axially opposed ends. A second elongate casing (5) is received in the first elongate casing (1) to define therebetween an axially extending space. The second elongate casing (5) includes...

An exhaust gas recirculation device in accordance with the present invention has an exhaust gas recirculation valve (100) interposed between the exhaust system and the intake system of an internal combustion engine, an exhaust gas recirculation cooler (200...

A flow path switching valve in accordance with the present invention is a switching valve in which a first port, a second port and a third port are formed in a valve passage within a housing, and the second port and the third port are changed over so as to...

The poppet valve (10), which is optionally a proportional valve, has a flat end piece or closure disc, carried on a shaft guided in a valve housing. The surface normal (N) to the flat surface of the disc, includes an angle (alpha) with the valve shaft.

An inlet flow connection (8) of the valve (2) casing (5) passes the gases to an inlet slot (13). The inlet slot is formed in a rotary- and/or sliding control plug (10), held in a flow chamber (15) in the casing. The first outlet slot (16) of this chamber i...

The exhaust gas feedback unit has a cooler (10) with bypass (12) and cooler (16) and bypass (18) valves operated coaxially from the same rotational or vacuum drive (44).

The exhaust gas heat exchanger(1) is connected to two ports located in the exhaust manifold and having two connections(15,17). The exhaust valve is located between one port and one side of the exhaust gas heat exchanger, with the other side of the heat exc...