1. Before installation, confirm whether the product performance and medium flow direction arrow of the factory are consistent with the movement condition, and insert and clean the inner chamber of the valve. It is not allowed to have impurities on the sealing ring and butterfly plate. Before cleaning, it is not allowed to close the butterfly plate to avoid damaging the sealing ring.

2. It is recommended to use the special flange for disc valve, i.e. hgj54-91 socket welding steel flange.

3. The best position for installation in the pipeline is vertical installation, but not inverted installation.

4. In use, the flow shall be adjusted and controlled by worm gear box.

5. For the butterfly valve with more opening and closing times, open the worm gear case cover in about two months, check whether the butter is normal, and keep proper amount of butter.

6. Check that the connection parts are required to be pressed tightly to ensure the honeybee of the packing and the flexible rotation of the valve rod.

7. Metal sealed butterfly valve products are not suitable for installation at the end of the pipeline. If it must be installed at the end of the pipeline, it is necessary to install the outlet flange to prevent overstocking and over positioning of the sealing ring.

8. The valve rod shall be installed and used in response to the regular inspection of the valve use effect, and any fault found shall be eliminated in time.