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Xvideos97ɫɫɫɫֵ,Ů˺ͼƬ,ü

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  • Դhappydollus.com
  • 2019-10-24
  • ھԃr

 

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  • 1. During installation, it shall determine whether the connection specification is consistent with the system in use. Hemispherical connection shall be adopted and the screw nut shall be used to completely match the two, so as to ensure good sealing effect when used.

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  • (51)
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  • (51)
  • 2. Globe valve manufacturers often use metal materials in the design of the valve, metal materials may appear in the use of corrosion, corrosion will form pitting on the surface of the valve, serious corrosion will appear penetration. Henan globe valve.

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