阀杆材质是符合美国材料试验协会ASTM B 371标准抗失锌现象的硅青铜，或B 99低锌合金，不含石棉的填料，和可锻或球墨铸铁手轮。
Stems shall be of dezincification-resistant silicon bronze ASTM B 371 or low-zinc alloy B 99, non-asbestos packing and malleable or ductile iron handwheel.
螺纹旋进式阀盖：通常用于轻型管道系统和小尺寸青铜多回转阀门中。
Threaded-in bonnet is common in lighter-duty services and smaller sizes of bronze multi-turn valves.
通常用作额定压力阀门的阀杆材料的硅青铜比普通黄铜具有更好的抗应力腐蚀裂纹的性能。
Commonly used as stem material in pressure-rated valves, silicon bronze has greater resistance to stress corrosion cracking than common brasses.
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