| 双向阀是两个独立的气源气压交替向一个方向流动，并且总是气压高的一方起作用，交替时压差达到0.2bar。此阀主要用于辅助制动，它的作用能使辅助制动/驻车制动同主车制动独立开，以防止制动力叠加。它主要用于弹簧制动气室，当辅助/驻车制动管路断裂时，能通过外部的空气能源来释放弹簧制动气室。the double check valve id used to alternate the direction of airflow when tow separate means of charging a line are available .thehigher pressure is effective at any given time ,and the charge -over takes place at a pressure difference of 0.2bar as a maximumvalue . in the main , the valve is used for the auxiliary brake forthe purpose of separating the normal service brake form theauxiliary /parking brake to prevent the addition of braking forces.the valve is mainly used as a pneumatic released valve for thespring brake cylinder of the auxiliary brake in the eventuality ofa rupture of the indirect brake line ,in which case it would benecessary to release the spring brake cylinder through an externalsource of air. |