Ventilation butterfly valve is a kind of simple structure of the regulator, at the same time can also be used for low pressure pipeline medium switch control. Ventilation butterfly valve is a kind of closed type butterfly valve. Ventilation butterfly valve used in chemical industry, building materials, ventilation, environmental protection engineering in power plant, glass and other industries of dust in the cold or hot gas pipeline, the gas medium to adjust flow or cut off the pipeline control unit. This valve shall generally be installed in the pipeline. Ventilation butterfly valve main products: large ventilation butterfly valve, electric valve, explosion-proof ventilation butterfly valve. Ventilation butterfly valve structure: the middle type disc plate and short structure, a new type of structure design and manufacture of the steel plate welding, compact structure, light weight, easy installation, small flow resistance, big circulation, avoid the influence of high temperature expansion, convenient operation. No the connecting rod, bolts, etc. , reliable operation, long service life. Can transfer installation, not affected by the medium flow ventilation butterfly valve working principle: ventilation butterfly valve can be divided into manual and electric drive, can be driven by motor or turbine driven actuators, make the disc plate freely within the range of 90 ° rotation to achieve the goal of open/close or adjusting medium flow. Points: ventilation butterfly valve installation position, height, import and export direction must comply with the design requirements, pay attention to the medium flow direction should be consistent with the body the direction of the arrow, connection should be strong. A visual inspection must be conducted before installation of valve, the valve nameplate should be consistent with existing national standards 'universal signal valve' GB 12220. For the working pressure is greater than 1. 0 MPa and the valve with the function of cutting off on ZhuGanGuan, strength and strict performance test should be done before the installation, qualified rear must use. Strength test, the test pressure for the nominal pressure of 1. 5 times, duration of not less than 5 min, shell and packing shall be no leakage of valve shall be qualified. Leak test, the test pressure for the nominal pressure of 1. 1 times; The duration of the test meet the requirements of GB 50243. Ventilation butterfly valve categories: ventilation butterfly valve according to drive electric butterfly valve pneumatic butterfly valve hydraulic electric hydraulic butterfly valve ventilation butterfly valve according to the structure of the center seal single eccentric butterfly valve seal eccentric butterfly valve, double sealing three eccentric butterfly valve sealing butterfly valve ventilation butterfly valve by a material soft sealing butterfly valve. Seal made of nonmetal soft materials of nonmetal soft materials. b。 Seal hard material from metal to non-metal of soft materials. Metal hard seal butterfly valve. Seal hard material from metal to metal hard material. A ventilation butterfly valve according to seal form forced sealing butterfly valve. Elastic sealing butterfly Industrial Valves. Sealing pressure by closing valve plate extrusion Industrial Valves seat, valve seat or valve plate elasticity of b. Plus torque seal butterfly valve. Sealing pressure produced by plus on the valve shaft torque pressurized sealing butterfly valve. Sealing pressure by seat or play a seal on the valve plate element charging - automatic sealing butterfly valve. Sealing pressure produced by medium pressure automatically. Ventilation butterfly valve according to the working pressure vacuum. Working pressure is lower than the atmosphere of butterfly valve. Low pressure butterfly valve. Nominal pressure PN< 6 mpa butterfly valve. Medium pressure butterfly valve. 5 - - 4 mpa butterfly valve. High pressure butterfly valves. Nominal pressure PN to 10. 0 - - 0 mpa butterfly valve. Super high pressure butterfly valve. Nominal pressure PN> Butterfly valve of 100 mpa. Ventilation butterfly valve according to the working temperature of high temperature butterfly valve. t> The butterfly valve of 450 ℃ temperature butterfly valves. 120 C
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