If the flange butterfly valve needs to be used to adjust the flow, adjust the opening position of the drive device to control it; the flange butterfly valve with frequent switching times should open the worm gear box cover within 3 months to check whether the butter is normal. Maintain an appropriate amount of butter; after the butterfly valve is installed and used, the use effect of the valve should be checked regularly, and any failure should be eliminated in time.Butterfly Valve Flange       Material     Carbon steel ASTM A105, A350 LF1, LF2, LF3, LF6, CL1/CL2,; A694 F52, F60, F65, F70; A516 Gr. 60, 70; BS-EN 10222-2 P245GH, P280GH; EN10222-4 P355NH, P355QH; EN10273 P250GH, P265GH; DIN 17243 C22.8; VD-TUEV350/3 C21; GB/T 1591 Q345B, Q420B; NB…

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