These valves vent accumulations of air and gas while the system is in operation and under pressure.
当系统在运行中和压力条件下市，这些阀门需要排泄大量的空气和气体。
In this process, the gas is mixed with air before the inlet valves.
在这个过程中，气体混合，然后进水阀的空气。
The relay valves which are used at the end of long pipelines can quickly fill gas cells with compressed air, for example, in trailer or semitrailer brake systems.
继动阀用于长管路的末端，使储气筒的 压缩空气快速充满制动气室，如在挂车或半挂车 制动系统中。
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