For the valves with nominal pressure of PN≤2.5MPa and working temperature of -40 ~ 250 ℃, copper alloy valves of water, seawater, oxygen, air, steam, oil and other media are available. See Table 1 for the selection of the main parts materials: Table 1 "copper alloy valve material selection Part Name Material Name Grades Standard No. Valve body, bonnet, opening and closing pieces Cast bronze ZCuSn3Zn1Pb4 GB / T 1176-1987 ZCuSn5Pb5Zn5 ZCuSn10Zn2 Casting ZCuSn16Si4 cast aluminum bronze ZCuA19Mn2, ZCuA19Fe4Si4Zn2 cast aluminum flavonoids ZCuZn31A12 Brass HMn