Butterfly Valves should be installed if possible a minimum of 6 pipe diameters from other line elements, i.e. elbows, pumps, valves, etc. Sometimes this is not feasible, but it is important to achieve as much distance as possible. Where the Butterfly Valve is connected to a check valve or pump, keep enough space between them to ensure the disc does not interfere with the adjacent equipment.

When Butterfly Valves are to be installed between welding type flanges, care should be taken to ensure no damage will occur to the seat:

1  Place the valve between the flanges with the flanges and valve body aligned. The disc should be 10% open.

2  Bolt the flanges to the valve body. Ensure the valve and flanges are aligned with the pipe.

3  Tack-weld the flanges to the pipe.

4  Remove the bolts and the valve from the pipe flanges and finish welding the flanges.

5  Wait for the pipe and flanges to cool before installing the valve. NOTE: Never complete the welding (after tacking) with the valve between flanges as heat transfer will cause severe seat damage.

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