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。
A new type of photo isolator has been developed by packing light emitting devices with silicon photo negative resistance devices face to face to realize electrical isolation.
将发光器件和硅光电负阻器件面对面地封装在一起，其间实现电隔离，构成一种新型光耦合器。
Mechanical seal: use of WB2 and st non-water-cooled adjustable end face sealing technology, composed of silicon carbide, high purity alumina ceramic, packing PTFE and graphite etc.
机械密封：采用WB2型、ST型不用冷却水可调式端面密封技术，由碳化硅，高纯度氧化铝陶瓷、填充四氟，石墨等材料制成。
Mechanical seal: use of WB2 and st non-water-cooled adjustable end face sealing technology, composed of silicon carbide, high purity alumina ceramic, packing PTFE and graphite etc.
机械密封：采用WB2型、ST型不用冷却水可调式端面密封技术，由碳化硅，高纯度氧化铝陶瓷、填充四氟，石墨等材料制成。
应用推荐