① Check butterfly valve specification, pressure, temperature and corrosion resistance before installation. All parts should be checked for damage or loosening.
③ Before installation, clean the sealing surface (both ends sealing surface, butterfly plate sealing surface, seat sealing surface) thoroughly, remove dust and dirt.
④ Before installation, the butterfly valve should be empty, the opening and closing should be flexible, the opening and closing position should be in accordance with the pointer indication position.
⑤ The butterfly plate must be in the closed position during installation to ensure that the butterfly plate does not collide with the pipe flange.
⑥ The opening position should be determined according to the rotation angle of butterfly valve butterfly plate.
⑦ Butterfly valve with bypass valve, open bypass valve before opening.
⑧ Install butterfly valves according to medium flow arrow.
What are the methods of butterfly valve troubleshooting?
Troubleshooting and elimination methods：
Common faults 1: Sealing surface leakage
Causes 1: Butterfly valve plate, sealing ring with debris
Exclusion methods: Remove impurities and clean the valve cavity
Causes 2: Butterfly valve plate, seal closed position is not correct
Exclusion methods: Adjust the limit screw of the actuator such as worm gear or electric actuator. To reach the valve closing position is correct
Causes 3: The outlet is equipped with flange bolts with force or not pressed
Exclusion methods: Check flange plane and bolt compression force, should be evenly pressed.
Causes 4: The pressure test direction is not as required.
Exclusion methods: Spinning in arrow direction
Common faults 2: Leakage on both ends of valve
Causes 1: Failure of sealing gasket on both sides
Exclusion methods: Replace sealing gasket
Causes 2: The pressure of the tube flange is uneven or not pressed
Exclusion methods: Press flange bolts (uniform force)
