a21f、a21h-c type are used for the equipment and pipeline of the air, ammonia, petroleum gas, etc, medium what the working temperature are less than 200℃.a21 w-p, r type are used for the equipment and pipeline fo the quality with corrode gas and liquid medium whatthe working temperature are less than 200℃.take for extra pressure protection devices.
ka21y type are used for liquefied petroleum gas what the working temperature are less than 100℃.
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