1. Fit Liwei check valve between flanges with flat or standard raised faces. Set the valve disc at a partially closed position and within the confines of the valve body.
2. Check the I.D. of the flange and pipe to ensure free disc movement, especially on cement or rubber lined, or heavily scheduled pipe.
3. Firstly, position the connecting pipe flanges in line with the pipe line system, allowing sufficient space between the flanges. Secondly, position the valve carefully between two flanges. Thirdly, center the valve properly and insert bolts through the upper and lower valve alignment holes. Fourthly, cross tighten all the bolts diagonally. Finally, check flange alignment and valve to ensure disc clearance.
4. Never weld the flanges with valve installed. Do not use flange gasket or sealing compound.
5. It is recommended to install the valve with its shaft being at a horizontal position and the lower part of the disc opened to a downstream direction, particularly when on slurry or sedimentary duties.
