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Installation and Maintenance Best Practices for Loose Flange Connections

Installation and Maintenance Best Practices for Loose Flange Connections

Apr 09,2024

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Analysis of Performance Characteristics and Design Requirements for Wafer Style Butterfly Valves


Wafer style butterfly valves can be used as devices for cutting off and regulating the flow of various media in pipelines. By selecting different materials for the valve plate and sealing seat, and through the use of plates and shafts connected without pins, it can be used for more demanding working conditions, such as desulfurization, vacuum and seawater desalination systems. The wafer style butterfly valve can achieve online maintenance of downstream pipelines and equipment, and can be installed as a valve at the pipe end as an exhaust valve.


Due to the three-dimensional eccentric principle design of the butterfly valve, the spatial motion trajectory of the sealing surface is ideal. There is no friction or interference between the sealing surfaces, and the appropriate selection of sealing materials ensures that wafer style butterfly valves are sealed, corrosion-resistant, heat-resistant, and wear-resistant and have reliable guarantees.


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Main features of wafer style butterfly valves


  • The opening torque of the wafer style butterfly valve is small, flexible, convenient, and energy-saving.

  • The three-dimensional eccentric structure makes the butterfly plate tighter as it closes, and its sealing performance is reliable, achieving no leakage.

  • Wafer style butterfly valves are resistant to high pressure, corrosion-resistant, wear-resistant, and have long service life.

  • The specifications of the wafer style and flange type flanges are the same, but the bolt of the wafer style butterfly valve is longer, with a length of "flange thickness + valve thickness + twice the thickness of two nuts". The valve itself cannot be flange connected by tightening it to the right. Once the bolts and nuts are removed, the pipelines at both ends of the valve will not work normally.


Design requirements for wafer style butterfly valves


When designing wafer style butterfly valves, special attention should be paid to the influence of thermal expansion, temperature alternation, and material mechanical properties. Because the thermal expansion coefficient of the material and the thermal load borne by the parts are different, the performance of the valve seat and valve core that are almost simultaneously heated at high temperature is different. In order to effectively reduce adhesion or abrasion between parts caused by temperature, it is necessary to appropriately increase the working clearance between valve parts. The increase in clearance should be determined based on the thermal expansion coefficient of the material, stress, and actual operating temperature.


High-temperature thermal hysteresis can cause the connection between the valve seat and guide sleeve of wafer style butterfly valves to loosen and exacerbate the fatigue aging of valve parts, etc. When designing wafer style butterfly valves, corresponding measures should be taken according to specific conditions, such as choosing an elastic valve seat for the sealing structure. High temperature will significantly affect the mechanical properties of the material. The strength, hardness, plasticity, elastic modulus, and Poisson ratio of the material will vary at different temperatures. Therefore, these factors should be fully considered in the design of the valve's performance.


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