Engine throttle valve

摘要

A rotary spool throttle valve (1) controls the air inlet pipes (9, Fig. 2) of two cylinders. The body 2 of the throttle valve may form an integral part of the engine cylinder head or the engine inlet manifold. The slotted edge (7, 8 Figs 2 and 3) of each spool through bore determines the flow cross-section at small valve openings and the spool is mounted in roller bearings 3.