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阀体和阀帽连接部位经过精密机加工。密封垫材料请参阅第3页，详细内容参阅第13页。
Body and bonnet joint accurately machined. Gasket materials on page 3, details on page 13.
youdao
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阀体和阀帽连接部位经过精密机加工。密封垫材料请参阅第3页，详细内容参阅第13页。
Body and bonnet joint accurately machined. Gasket materials on page 3, details on page 13.
youdao