从 1995年起 ,12 0阀作为货车主型阀全面推广 ,至今已有 10万辆左右的车辆装备了该阀。为了加快这一进程 ,对 12 0阀近年来出现的故障 ,更应高度重视 ,及时试验改进 ,使之不断完善。目前 ,12 0阀易发故障之一就是主阀膜板易破 ,致使膜板窜风 ,制动机不能缓解 ,造成车轮擦伤等事 Since 1995, the valve has been fully popularized as a truck main valve, and so far about 100,000 vehicles have been equipped with the valve. In order to speed up this process, more attention should be paid to the failures that have occurred in recent years in the 12 0 valve so that improvements can be made in a timely manner and improved. At present, one of the valve failure is easy to break the main valve plate, resulting in film flew wind, brake can not be mitigated, causing the wheel scratches and other things