Chapter 3 Ventilation system Section 1 Valve train 1.The Type of Valve Train Common types of valve train are two kinds of valve and porosity. Overhead valve By valve position Side valve Gear transmission Valve By transmission Chain transmission Toothed belt transmission Two valve By valve number Four valve Automobile and Tractor Northwest A&F UniversityAutomobile and Tractor Northwest A&F University Chapter 3 Ventilation system 1. The Type of Valve Train Common types of valve train are two kinds of valve and porosity.  Valve By valve position  Overhead valve Side valve By transmission  Gear transmission Chain transmission Toothed belt transmission By valve number  Two valve Four valve Section 1 Valve train