As a pressure relief valve, it can maintain the water pressure in the set way below the safe value;
作泄压阀用时，可维持供水路压力在设定的安全值之下；
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.
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。
When the pressure to a safe value, the pressure relief valve closes automatically.
当压力恢复到安全值时，泄压阀自动关闭。
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