Large-diameter butterfly valve

I. Product Introduction:
Metal-seated butterfly valves generally have a longer service life than elastomer-seated ones, but it is difficult to achieve complete sealing. Metal seals can withstand higher working temperatures, while elastomer seals have the drawback of being temperature-limited. Large-diameter butterfly valves, especially lug-type butterfly valves, feature a simple structure, small volume, and light weight, consisting of only a few parts. They can be quickly opened and closed with just a 90° rotation, making operation simple. Additionally, this valve has excellent fluid control characteristics. When the butterfly valve is fully open, the thickness of the disc creates the least resistance to the medium flowing through the valve body, resulting in a very small pressure drop across the valve, thus providing good flow control performance. Butterfly valves are available in two sealing types: elastomer seals and metal seals. For elastomer-seated valves, the sealing ring can be embedded in the valve body or attached to the periphery of the disc.

II. Product Features:
1. This valve adopts a triple-offset sealing structure, with almost no wear between the valve seat and the disc, providing a tighter sealing effect as it is used.
2. The sealing ring is made of stainless steel, combining the dual advantages of metal hard sealing and elastomer sealing. It maintains excellent sealing performance at both low and high temperatures, and is corrosion-resistant with a long service life.
3. The sealing surface of the disc is built-up welded with cobalt-based hard alloy, making it wear-resistant and ensuring a long service life.
4. Large-sized discs use a truss structure, offering high strength, large flow area, and low flow resistance.
5. This valve has a bidirectional sealing function, so installation is not restricted by the flow direction of the medium or spatial position, allowing installation in any orientation.
6. The driving device can be installed in multiple positions (rotated by 90° or 180°), which is convenient for users.

III. Product Applications:
1. Used in gas pipelines in the sulfuric acid industry: inlet and outlet of front-furnace blowers, inlet and outlet of booster blowers, series and connecting valves for electrostatic precipitators, inlet and outlet of SO₂ main blowers, converter regulation, preheater inlet and outlet, etc., for regulating and cutting off gas flow.
2. Used in sulfur-burning, conversion, and drying absorption processes in the sulfuric acid production system. It is a trusted valve brand for sulfuric acid production devices, recognized by users for its good sealing performance, light operation, corrosion resistance, high temperature resistance, convenient and flexible operation, and safe and reliable use, thus being widely promoted and applied.
3. Also widely used in pipelines carrying media such as SO₂, steam, air, coal gas, ammonia gas, CO₂ gas, oil, water, brine, alkali liquid, seawater, nitric acid, hydrochloric acid, phosphoric acid, etc., in industries including chemical, petrochemical, smelting, pharmaceutical, food, etc., as regulating and cutoff devices.

IV. Product Parameters:

V. Component Materials: