Structural Characteristics And Working Principle Of Triple Eccentric Multi-level Hard Seal Butterfly Valve

Lined Butterfly Valve Structural features and working principle:
1. The biggest difference between the three-eccentric multi-layer hard-sealed butterfly valve and other butterfly valves is that it adopts a three-eccentric design structure. The installation center and the rotation center of the butterfly plate are designed with a strict eccentric distance. When the valve is opened by 10° or even fully opened, the valve seat sealing surface of the butterfly valve and the butterfly plate are in a non-contact state, and when closed, the butterfly plate rotates with the valve stem and deflects into the valve seat sealing surface to make it airtight. Therefore, the service life of the valve is extended due to less or no wear during the opening and closing process.
2. The valve seat of the three-eccentric multi-layer hard-sealed butterfly valve is combined into a seal with an embedded O-type rubber ring or fluoroplastic as a sealing gasket. Therefore, it has the function of self-compensation for temperature difference and wear, ensuring that the valve is airtight and leak-proof.
3. When the fluid pressure of the butterfly valve pipeline is transmitted into the valve seat sealing groove, due to the Posson's force principle, the combined force generated by the seal under the pipeline pressure and the expansion force of the O-ring squeezes the valve seat sealing surface toward the butterfly plate to seal the valve. This unique sealing structure can generate greater sealing force as the pipeline pressure increases.
4. The valve seat of the butterfly valve can be fine-tuned. After the valve has been used for a certain number of years, when the sealing ring wears out and leaks, the sealing pressure ring can be fine-tuned to the required size in the direction of the butterfly plate without disassembling the valve, so that compensation can be obtained and the same sealing performance as the new valve can be obtained.
5. In addition to manual devices, the three-eccentric multi-level hard-seal butterfly valve series can also be equipped with pneumatic devices or electric devices to form manual butterfly valves, pneumatic butterfly valves (with feedback signals and electric-pneumatic valve positioners) and electric butterfly valves. Three categories and six series of products.

The three-eccentric multi-layer hard-sealed butterfly valve products can be used in industrial pipelines such as petrochemical, food, medicine, textile, papermaking, electricity, sewage treatment, water supply and drainage, and smelting. It can be used as an opening and closing mechanism to control the flow of media on a variety of gas, liquid, semi-fluid and micro-particle powder conveying pipelines or containers. The three-eccentric multi-layer hard-sealed butterfly valve can be installed at any position. The three-eccentric multi-layer hard-sealed butterfly valve series has a certain self-cleaning ability. It can show a variety of advantages when used in sewage pipes such as steel mills and municipal pipelines. It does not require maintenance, has good sealing and is easy to operate.