Ball valve and butterfly valve is the biggest difference between the opening and closing piece is a piece of board, which is a ball valve, butterfly valve plate and the ball valve is rotated around its own axis for movement; gate valve for valve plate movements along the axis of movement; butterfly valves and gate valves to regulate flow through the opening degree; ball is not easy to do this.
Butterfly valve is characterized by open and close faster, simple structure, low cost, but the rigor and pressure are not good. Similar characteristics and gate valve, however, resistance by the volume and open and close limits; it is difficult to achieve large-caliber.
Butterfly structure principle is particularly suitable for production of large diameter butterfly valve butterfly valve plate installed in the pipe diameter direction. Cylindrical channel in the valve body, disc-shaped disc around the axis of rotation, rotation angle 0 ° ~ 90 ° between the rotations to 90 °, the valve is open all license conditions. Its structure is simple, low cost, large tuning range. Valve is usually applied to non-particulate impurities like liquid, gas, fluid pressure loss, good sealing performance and high cost. In comparison, the valve seal a little better than the butterfly. Long-term valve seat seal is squeezed by the sphere, it must wear faster than the semi-ball valve, the valve seal is usually the use of flexible materials, but also difficult to use in high-temperature high-pressure pipeline. Valve seal is rubber as the intermediary, it is higher than a half ball valve, ball valve, and gate valve metal seal performance varies significantly. Half ball long-term use, the seat will also produce small quantities of wear and tear, it can be adjusted to continue to use the stem and stem packing in the opening and closing process simply rotated 90 °, there is evidence of leakage, and then compression packing gland bolts a little, no leakage at the packing can be achieved, while the other is a small drain valve is still reluctant to use, great for valve leakage.

MORE NEWS