The characteristics of the butterfly valve is to open and close fast, simple structure, low cost, but the rigor and the poor bearing capacity of The ball valve characteristics and gate, however, limited by the volume and opening and closing resistance, it is difficult to achieve large-caliber.

Principle of the structure of the butterfly valve is particularly suitable for the production of large diameter valve butterfly valve disc to install the pipe diameter direction. In the cylindrical channel of the valve body, disc-shaped disc around the axis of rotation, the rotation angle between 0 ° ~ 90 ° rotation to 90 ° when the valve is open all license conditions. Its simple structure, low cost, large tuning range.

Butterfly valve seal is a rubber as an intermediary, it is a far cry from the half-ball valve, ball valve, gate valve, metal seal performance. Half ball after long-term use, the seat will also produce small quantities of wear and tear, it can continue to use by adjusting the stem and the packing in the process of opening and closing the valve stem just rotated 90 °, there is evidence of leakage, and then compress the packing gland bolt a little, you can achieve the packing is no leakage, while the other valve is still a small leak reluctant to use the large leakage change valve.

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