Application of metal hard sealing butterfly valve in low temperature equipment

With the rapid advancement of industrial technology, the demand for valves has become more stringent, especially for butterfly valves used in cryogenic environments. These valves must not only meet general performance standards but also ensure reliable sealing at low temperatures, smooth operation, and other special requirements. As industries continue to evolve, the need for high-performance cryogenic valves has grown significantly, particularly in fields such as chemical processing, air separation, and gas liquefaction. In China, over 80% of valves used in critical low-temperature equipment are gate or globe valves, while butterfly valves remain relatively uncommon. This is primarily due to the poor sealing performance of traditional metal-seated butterfly valves under low-temperature conditions. Issues like internal leakage and structural inefficiencies have led to safety concerns and operational failures in these systems. To address this, significant efforts have been made to improve the design of metal-sealed butterfly valves. A new type of high-eccentric, pure-metal-sealed butterfly valve has been developed, featuring a patented structure that ensures excellent sealing performance across both high and low temperature ranges. This innovation marks a major step forward in meeting the growing demands of the market. One of the key aspects of low-temperature valve performance is the sealing capability. There are two main causes of leakage: internal and external. Internal leakage often occurs due to thermal contraction and deformation of the sealing surfaces at low temperatures, which can lead to misalignment and loss of seal integrity. For example, a DN250 butterfly valve tested with liquid nitrogen (-196°C) showed a deformation of about 0.12mm on the sealing surface, resulting in significant internal leakage. The newly designed butterfly valve addresses this issue by using a conical elliptical sealing surface combined with a floating elastic sealing ring. This allows for better compensation of thermal expansion and contraction, ensuring a tight seal even under extreme conditions. When the valve opens, the elastic ring returns to its original shape without friction, extending the valve's service life. External leakage is another concern, especially at flange connections and around the stem packing. Traditional materials like PTFE (F4) are widely used due to their low friction and chemical resistance, but they suffer from cold flow and large thermal expansion, leading to leakage at low temperatures. To solve this, the new cryogenic butterfly valve uses a self-shrinking sealing structure that compensates for temperature changes, maintaining a secure seal in both normal and low-temperature environments. This advancement in cryogenic valve technology represents a significant improvement in reliability, efficiency, and safety, making it an ideal choice for modern industrial applications. Whether it’s a high-performance butterfly valve, a ball valve, or a hard-seated valve, the focus remains on delivering superior performance in challenging conditions.

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