A21 is the spring Weiqi safety valve thread.
Type A21H is suitable for the work temperature are less than 200 of the air, ammonia, oil gas and other media equipment and pipeline.
Type A21W is suitable for equipment and Road gas or liquid for working temperature is not higher than 200 DEG with corrosive on.
Type A21F is suitable for the work temperature are less than 200 of the liquefied gas, gas pipeline and other equipment. As overpressure protection device
Type A21H is suitable for the work temperature are less than 200 of the air, ammonia, oil gas and other media equipment and pipeline.
Type A21W is suitable for equipment and Road gas or liquid for working temperature is not higher than 200 DEG with corrosive on.
Type A21F is suitable for the work temperature are less than 200 of the liquefied gas, gas pipeline and other equipment. As overpressure protection device
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