Relay valves convert a sustained air flow from a three-way pilot valve into a momentary pulse or bleed, which shifts a control valve and then closes.
延迟阀可调节从三通控制阀到瞬间脉冲或放气阀的空气流量，放气阀或瞬间脉冲改变控制阀，然后关闭。
2
Zhuji City, Jian-Ling Machinery Factory is a company specialized in production of auto parts such as manual valve, master cylinder, relayvalve, clutch booster, air dryer and spring brake chamber.
The mounted location of high-pressure safty valve and the connecting position of the control air pipe of air pressure relay of JZ-7 brake system are analysed.