PTFE-lined butterfly valves play a critical role in fluid control systems across various industries. However, over time and with changing operational conditions, these butterfly valves often encounter technical challenges and operational issues, primarily revolving around sealing performance, structural adaptability, and leakage. Let's delve deeper into these problems and explore potential solutions.

1. Sealing Performance Issues

The sealing performance of PTFE-lined butterfly valves is paramount for their proper functioning. However, prolonged exposure to media can lead to seal ring damage, thereby compromising sealing effectiveness. This issue becomes particularly acute in harsh environments characterized by high temperatures and pressures.

Solutions

Utilization of High-Performance PTFE Materials: Employing high-performance PTFE materials, such as specialized polytetrafluoroethylene (PTFE) and fluororubber, enhances the durability and stability of seal rings.
Structural Optimization: Redesigning the valve plate structure to ensure more uniform stress distribution on the seal ring, thereby reducing media-induced erosion and extending its service life.

2. Structural Adaptability Issues

The inherent thickness of PTFE-lined butterfly valve structures renders them unsuitable for use in small-diameter valves, limiting their application in certain scenarios.

Solutions

Lightweight Structural Design: Employing lightweight materials or optimizing structural designs to reduce the thickness of the valve plate and mitigate flow resistance, thus catering to the needs of small-diameter valve applications.
Diversified Design Approaches: Offering a range of specifications and structural designs for PTFE-lined butterfly valves to meet the diverse requirements of different users and operational environments.

3. Leakage Issues

In reverse flow conditions, increased media pressure may cause leakage between the valve plate and seat, jeopardizing system safety and stability.

Solutions

Spring Compensation Mechanism: Introducing spring and adjusting bolt structures to enable automatic adjustment of the sealing surface pressure between the valve plate and seat in response to changes in media pressure, thereby preventing leakage.
Sealing Material Upgrades: Incorporating a combination of metal hard sealing and soft sealing designs to enhance sealing performance, achieving zero leakage even under varying temperatures and pressures.

Through a comprehensive analysis of the issues encountered in the use of PTFE-lined butterfly valves and the exploration of potential solutions, it becomes evident that through structural optimization, material upgrades, and innovative mechanisms, these valves' performance and reliability can be significantly enhanced. This, in turn, ensures the provision of stable and reliable fluid control solutions across industrial applications.