设置安全阀可使得在轮胎压力达到设定值时，筒体形成空载。
The arrangement of the safety valve makes the barrel body form zero load when the tyre pressure reaches the set value.
其安全阀是通过密封垫和调节弹簧构成的，当进口压力大于设定值时克服弹簧压力， 把过压气体泄放出去。
The relief valve consists of a sealer and an adjusting spring. When the inlet pressure is greater than a set value, the spring pressure is overcome to discharge over-pressure air.
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