Butterfly valve features: (1) Butterfly valve lever open and close the structure, so that the relative sliding butterfly valve seal is small, reducing the relative wear and tear. (2) butterfly valve actuator by force amplification mechanism. This mechanism in the butterfly valve is closed, the drive can output the maximum torque, and has self-locking performance, safe and reliable. (3) the use of metal seal structure, butterfly valve has a strong corrosion resistance and wear resistance, suitable for high temperature environment, long service life. (4) The key components of the butterfly valve are optimized, so that the total valve opening and closing times can reach 1 × 106 times or more. (5) Butterfly valve control system uses non-contact butterfly valve reed switch, not subject to environmental conditions, and signal sensitivity, butterfly valve accuracy is high, you can achieve remote control, pneumatic control and automatic control, and equipment can also be achieved without supporting People operate. Butterfly valve failure and elimination of ways: 1 filler leakage 2 packing gland is too loose, the packing gland can be evenly screwed on the nut. 3 packing circle is not enough, should increase the filler. 4 filler due to prolonged use or improper failure, should replace the new packing. 5 between the valve body and disc sealing surface leakage between the sealing surface 6 dirt, can be washed to eliminate it. 7 sealing surface damage should be re-welding process. 8 soft ring damage, new seal can be replaced. 9 stem rotation is not flexible 10 packing pressure is too tight, should be properly loosen the packing gland nut. 11 packing gland position is not correct, the stem stuck, should be evenly screwed packing gland nut, the gland to return to normal position. 12 stem and stem bearing biting, injury, should be removed to eliminate it.