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Concentric butterfly valve can be installed on the horizontal, vertical and any angle pipe.Also it can be used in bothdirections. And worker must clean the inner cavity and sealing cover of the valve and pipes before installation.Concentric butterfy valve must be in the closed position during installation to ensure that the disc does not colide with thepipe flange make sure the flange welding is correctt is not allowed to weld any fange again for avoiding any burning on the rubber parts or anti-corrosion coating after
installed
Wafer concentric butterfy valve must be quipped with assembling flange .Put the butterfly valve into the middle of thespecial flange at both ends of the pipeline, and use the double head bolt through the pipeline fange and clamp butterflyvalve to lock tightly, then it can be used normally.