Electronic throttle body made of two plastic materials having different strength

The present invention relates to a moulded electronic throttle body (1) for controlling a flow of air (14), for example in an internal combustion engine. The electronic throttle body (1) comprises a housing (2) having a first part (4) having an air passage (8) therethrough and in the passage (8) a valve seat (10) and a throttle valve (12) that can be moved with respect to the valve seat (10) to open and close the passage (8) to control said flow of air (14). A second part of the housing (6) has one or more mounts (15-18) therein and an electronically driven throttle actuator (20) secured to said mounts (15-18). The housing (2) is formed from a first moulded plastics material (24) co-moulded with a second moulded plastics material (26), the temperature stability and/or creep stability of the first material (24) being superior to that of the second material (26). Both the valve seat (10) and the throttle actuator mounts (15-18) are formed in the first material (24), the first material (24) extending contiguously between the valve seat (10) of the first part of the housing (4) and the throttle actuator mounts (15-18) of the second part of the housing (6).