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.
阀杆材质是符合美国材料试验协会ASTMB 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.
阀杆材质是符合美国材料试验协会ASTMB 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。
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