Ice formation on the cylinder and especially on the valve and piping, coupled with the decrease in flow as the cylinder pressure drops, is sometimes misinterpreted as blockage in the valve.

• 在钢瓶上，特别是在阀门和管道上结冰，加上因为钢瓶压力下降引起的流速下降，有时候会被误认作阀门内的阻塞物。