当罐内气体的压力在机械呼吸阀的控制压力范围之内时，呼吸阀不动作，保持油罐的密闭性；
When the pressure of the gas tank in the mechanical breathing valve control pressure within the breathing valve does not move, keep the tank airtight;
当罐内气体的压力在机械呼吸阀的控制压力范围之内时，呼吸阀不动作，保持油罐的密闭性；
When the pressure of the gas tank in the mechanical breathing valve control pressure within the breathing valve does not move, keep the tank airtight;
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