1. All parts of butterfly valve, whether manual, pneumatic, hydraulic or electric, have been strictly debugged before leaving the factory. When the user rechecks the sealing performance, he shall fix both sides of the inlet and outlet evenly, close the butterfly valve, put pressure on the inlet side, and observe whether there is leakage at the outlet side. Before the strength test of the pipeline, the disc plate shall be opened to prevent damage to the sealing pair.

2. Although the butterfly valve has been strictly inspected and tested before leaving the factory, there are also some automatic screw displacements of some products during transportation, which need to be readjusted, pneumatically operated, hydraulically operated, etc. Please refer to the operation manual of the supporting driving device.

3. When the electric drive butterfly valve leaves the factory, the opening and closing stroke of the control mechanism has been adjusted. In order to prevent the wrong direction when the power supply is connected, the user first opens the manual switch to the half open position after the power is connected for the first time, and then press the electric switch to check that the direction of the indicator wheel is the same as that of the valve.