As an indispensable and important component in the fluid control system, the sealing performance of the manual butterfly valve directly affects the safety and reliability of the entire system. Among the many sealing technologies, the multi-layer sealing structure has become an important choice in the design of manual butterfly valves due to its excellent sealing effect and wide range of applications.
Basic concept of multi-layer sealing structure
The multi-layer sealing structure refers to the arrangement of multiple layers of sealing rings made of different materials between the valve seat and the butterfly plate of the manual butterfly valve to achieve a more reliable sealing effect. This design is usually composed of sealing rings made of multiple materials (such as rubber, polytetrafluoroethylene, metal, etc.), each layer of sealing ring has a specific function, and the overall sealing performance of the valve is improved through synergy.
Main features of multi-layer sealing structure
Excellent sealing performance
The multi-layer sealing structure effectively improves the sealing performance of the valve through the mutual cooperation of sealing rings of different materials. For example, the rubber sealing ring can fit tightly to the valve seat sealing surface due to its excellent elasticity and wear resistance; the polytetrafluoroethylene sealing ring can resist the erosion of media under harsh working conditions due to its excellent corrosion resistance and high temperature resistance; the metal sealing ring has high strength and hardness and can withstand high pressure and temperature. These sealing rings of different materials complement each other and jointly build an efficient sealing system.
Strong adaptability
The multi-layer sealing structure can flexibly adapt to the characteristics and pressure requirements of the medium under different working conditions. Since sealing rings of different materials have their own unique performance characteristics, designers can make reasonable choices based on the corrosiveness, temperature, pressure and other parameters of the medium to meet diverse sealing needs. This strong adaptability makes the multi-layer sealing structure particularly widely used in manual butterfly valves.
Extended service life
By increasing the number of layers and material types of sealing rings, the multi-layer sealing structure effectively reduces the load borne by a single sealing ring, thereby extending the service life of the sealing ring. In addition, the complementary effects of sealing rings of different materials in terms of wear resistance and corrosion resistance also improve the overall service life of the valve.
Reduced leakage risk
The multi-layer sealing structure significantly reduces the risk of leakage through the synergistic effect of multiple layers of sealing rings. Even if a layer of sealing ring fails due to wear or damage, the sealing rings of other layers can continue to play a role to ensure that the sealing performance of the valve is not affected. This multi-protection design feature enables the multi-layer sealing structure to perform well under harsh working conditions such as high pressure, high temperature or corrosive media.
Application fields
Manual butterfly valves with multi-layer sealing structures are widely used in industries such as petroleum, chemical industry, electric power, and metallurgy, especially in situations where high safety and high reliability are required. Its excellent sealing performance and adaptability can effectively cope with various complex working conditions and meet customers' high requirements for equipment safety and stability.
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