Shacman F3000 F2000 H3000 RHD FAST Gearbox Double H Air Valve F99660
Double H valves are mainly used to achieve high and low gear switching and basic gear switch with sub-boxes, and single H valves are used to switch without sub-box.
Single H Valve, in fact, the single-way air valve, airflow passes through the transition of 1.2.3.4 gear. The double H valve is a dual air valve, which is 1.2.3.4 transitions all the way, and the high-speed 5.6.7-speed conversion is achieved through the second box.