What are the characteristics of non electric butterfly valves? As the name implies, the non electric butterfly valve refers to the main material of the pipe body that constitutes the expansion joint, as fiber fabric or other special non materials. The important accessories of the non electric butterfly valve are an important guarantee for the normal operation of the non electric butterfly valve. Therefore, these parts shall be properly selected according to different service conditions and characteristics of non electric butterfly valves.
1. Liner: used to reduce the inner wall of the non electric butterfly valve pipe and the cylinder through which the fluid passes, so as to reduce the fluid resistance and protect the inner surface of the pipe. Also called inner sleeve or conduit. The lining material can be the same as or different from the pipe.
2. Stop bar: set on the expansion joint assembly. It is usually made of rods or rods. It is mainly used to limit the movement range (axial, transverse, angular direction) of the pipe under normal working conditions. When the support is damaged during the main fixation, this component can prevent the non electric butterfly valve pipe from over stretching and compression, and can also control all internal pressure loads and dynamic loads caused by the support damage.
3. The non electric butterfly valve adopts a labyrinth structure to prevent the reverse migration of flue gas. Aluminum silicate fiber felt and aluminum silicate limit cotton can not only reduce the operating temperature of the non electric butterfly valve, but also prevent flue gas from entering
4. The end plates on both sides of the non electric butterfly valve are welded on the two connected flue ducts and ash ducts respectively, and the refractory insulation materials are filled between the lining wall and the high-temperature resistant fiber to prevent the leakage of flue gas and fly ash.
5. The expansion gap between the non electric butterfly valve connected flue and ash duct is filled with a fire-resistant steel wire mesh seal ring wrapped with fire-resistant fiber to prevent fly ash from depositing in the expansion gap, thus impeding the normal process of thermal expansion; At the same time, the anti channeling of smoke is also prevented.