1. Before installation, check whether the specifications and materials of the centerline butterfly valve conform to the design.2. Clean the sand, foreign matters and miscellaneous debris inside the centerline butterfly valve before installation to avoid improper operation or leakage.3. The piping related to the centerline butterfly valve shall be properly suspended and fixed according to the regulations before installation to avoid undue stress on the valve after installation.4. The centerline butterfly valve piping between the two flange surface must be parallel alignment concentric.5. There is no need to add gasket between the centerline butterfly valve and flange during installation.6.The centerline butterfly valve and the check valve or pump close to, in the middle of the use of progressive expansion joint, valve disc switch torsion will not be hindered.