阀门的压力温度等级是在指定温度下，用表压表示的最高作用工作压力，当温度升高时，许用工作压力随之降低。为使用户能正确选用所需阀门，避免损失，按照国家GB12224—89标准的有关规定，特列各种材料的压力温度等级表。如下：
钢材型号
介质最高温度(℃)碳钢WCB200250300350400425435445455-----铬钼钢(1Cr5mov)200320450490500510515520535545----铬钼钒钢(1Cr1mov)200320450510520530540550560570----铬镍钛钢(1Cr18Ni9Ti)200300400480520560590610630640660675695700公称压力PN(Mpa)试验压力PS(Mpa)工作压力(MPa)1.62.41.61.41.251.110.9O.8O.70.64O.560.5O.45O.40.362.53.82.52.221.81.61.41.251.11O.O.8O.70.64O.564643.63.22.82.52.221.81.61.4，1.251.11O.96.49.66.45.654.543.63.22.82.52.221.81.61.4101510987.16.45.654.543.63.22.82.52.21624161412.511.210987.16.45.654.543.620302018161412.511.210987.16.45.654.825382522.52018161412.511.5109876.45.632483228252252018161412.511.210987.14056403632282522.52018161412.511.210950705045403632282522.52018161412.511.2
来源：中国电站集控运行技术网
