![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
In recent years, with the advancement of modern industrial technology, butterfly valves have expanded their application from low-pressure water systems to media operating at temperatures exceeding 538°C and as low as -184°C. Pressure ranges have also broadened, making these valves widely used in industries such as air separation, chemical processing, metallurgy, and wastewater treatment. As the demand for larger sizes, improved performance, and longer service life grows, traditional rubber and plastic-sealed butterfly valves have become less suitable due to issues like wear, aging, and difficulty in maintenance.
For example, in modern air separation plants that rely on cryogenic separation, the process often involves a molecular sieve pre-purification stage. The working pressure typically ranges from 0.5 to 0.9 MPa, and the medium temperature varies between 10°C and 200°C. In such environments, large-diameter, frequently operated valves face challenges, especially with rubber seals that tend to degrade quickly under continuous use. This has led to frequent replacements and operational inefficiencies.
To address these challenges, our company has developed a series of metal-enhanced pneumatic sealing butterfly valves. This innovative design has been granted a national utility model patent (Patent No. ZL 97 2 24037.3). These valves offer significant improvements in durability, reliability, and performance.
The key features of the metal-seal pneumatic butterfly valve include:
1. A lever-type opening and closing mechanism reduces relative wear by minimizing sliding between the seal components.
2. The actuator uses a connecting rod amplification mechanism, which provides maximum torque when the valve is closed and ensures self-locking for enhanced safety.
3. The metal-seal structure offers strong resistance to corrosion and wear, making it ideal for high-temperature applications and ensuring a long service life.
4. Key components are optimized to allow over 1 million cycles of operation, significantly improving the valve’s longevity.
5. The control system employs non-contact electromagnetic reed switches, offering high sensitivity, accuracy, and compatibility with remote and automatic control systems.
The valve's structure includes a lever-type opening mechanism and a connecting rod force actuator. When the valve is closed, the spindle and lever are secured with a conical pin, allowing the lever to rotate around a pivot point, driving the butterfly plate into contact with the seat. This creates a tight, axial pressure seal instead of relying on radial compression, reducing wear and improving sealing performance.
The flat metal seal design further enhances performance. Unlike traditional spherical seals, this design allows for better control of sealing interference and improves adaptability to temperature changes. The use of stainless steel and copper-based alloys ensures excellent corrosion and wear resistance, even in extreme conditions ranging from -40°C to 300°C.
Through rigorous testing, including performance tests and simulated field conditions, the valve has demonstrated exceptional reliability. For instance, after 8,000 cycles at 150°C, the valve showed no signs of leakage or wear. It has been successfully applied in various large-scale air separation projects, including a 15,000 cubic meter plant in Tianjin and a 16,000 cubic meter plant in Lunan. These applications have proven the valve’s ability to replace imported alternatives and meet demanding industrial standards.
Today, our valves are not only used in air separation but also in chemical, metallurgical, and gas pipeline industries. Their advantages—such as fire safety, minimal maintenance, and cost-effectiveness—make them an ideal choice for large-diameter applications. With growing market acceptance and proven performance, the metal-seal pneumatic butterfly valve is well-positioned to lead the industry and drive future innovation.
Industrial grade Ammonium Chloride is a white powder or granular crystalline form, odorless, salty, and refreshing. Easy to absorb moisture and clump, soluble in water, soluble in glycerol and liquid ammonia, insoluble in ethanol, insoluble in acetone and ether, sublimated at 350 ℃, aqueous solution shows weak acidity. Mainly used in batteries, electroplating, dyeing and weaving, casting, medicine, flocking, fluff, chemical intermediates, and other fields.
Industrial Grade Ammonium Chloride
TIANJIN LIHE TRADING CO.,LTD , https://www.lihecorp.com