Flanged Butterfly Technical Manual § Overview www.yyfm168.com The valve is factory according to the latest standard design, in absorbing foreign advanced technology, based on the successful development of a large-diameter butterfly valve structure has been improved, the performance reliable, widely used in medium to low, medium and high-pressure water, sediment, water, seawater pumping station piping, installed in the pump outlet for closing, regulating purposes. ◇ Flanged Butterfly First, the structural characteristics: 1, three eccentric structure www.yyfm168.com 2, the flange butterfly took three eccentric structure, from geometry such that the valve seat and the valve disc seal completely the entire switching process detachment, this unique combination of eccentric, both the use of a cam effect, but also completely eliminates friction, enabling the valve opening and closing stroke of 90 °, with the butterfly valve multilayer board to eliminate friction between the elastic seal the result of wear of the sealing surface may be produced valve leak, greatly extending the life of the valve, the valve sealing surface pressure can be carried out by an external torque to make any adjustment of change, to seal the more reliable will not clearance phenomenon occurs. 2, multi-layered elastic metal ring www.yyfm168.com flange butterfly valve plate mounted on the use of multi-level elastomeric seals to achieve true zero leakage. Butterfly board multilevel flexible ring is made of stainless steel plate and high-quality asbestos layers are superimposed repression. It is with metal sealing hardness and good anti-friction properties, but also has a soft elastic sealing and good sealing performance, when an external force is applied to the valve stem through the torque, but also the radial compression and soft seals move, The seal with the valve seat surface is a "cone cone" structure, two cones are oblique cone, the contact between the valve seat ring and a slight angle of the "wedge effect", the seal ring occurs Sophie actions and radial compression. It is because the valve seat ring and uniform contact between the flexible seal around the valve seat to produce uniform load and thus with a minimum of torque to achieve the most rigorous cutting, resulting in leakage of the valve reaches zero. 3, flange butterfly valve shaft bottom flange butterfly valve shaft sealing structure bottom seal with metal spiral wound flat pad plus quality rubber "O"-ring double seal structure, valve end and valve cover flange connected by convex structure, sealing Mat is edging metal spiral wound gasket, the pad that has a higher strength, and reliable sealing performance, while in the upper part of self-lubricating bearings, between the stem and the body has a "O"-ring seals, which effectively prevent leakage from the bottom of the valve. That effectively prevent leakage from the bottom of the valve, the self-lubricating bearings and play a protective role. www.yyfm168.com 4, disc seals can be adjusted, which facilitates assembly and maintenance. 5, through a suitable choice of materials, making the valve has a low resistance (high) temperature, corrosion-resistant performance. 6, the disc's streamlined design makes the loss of fluid resistance is small, can be described as an energy-saving products. 7, due to the unique seal structure, flexible operation of the valve, effort, convenient and reliable. 8, the product can close cut off media, you can also adjust the media traffic.