ir_71 发表于 2014-4-12 13:06:18

BS EN 558:2008

BS EN  558:2008
Industrial valves - Face-to-face and  Centre-to-face  dimensions of Metal  Valves for use in Flanged  Pipe systems -
PN and Class designated valves


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admin 发表于 2014-4-14 10:05:17

谢谢您的分享，金币已奖励！
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