I. Overview D643H pneumatic multi-level hard sealed butterfly valve series products, the Department of long-life, energy-saving butterfly valve. Its structure using three-dimensional knitting heart design principle, the use of hard and soft seat seal compatible multi-level structure, processing skills, advanced technology. The product consists of the main components of the valve body, disc, multi-level seat, stem, transmission and other components. It is widely applied to the pipe metallurgy, electric power, petroleum, chemicals, air, gas, flammable gas, and water supply and drainage and other corrosive media. Second, the characteristics as the product is used in three-dimensional eccentric butterfly design principles to make space trajectory to reach the ideal sealing surface, no friction between the seal faces to each other, without interference, coupled with the sealing material right choices so sealing butterfly valves, corrosion resistance, heat resistance and wear resistance has been a reliable guarantee. Its main features are as follows: 1, open torque, flexible and convenient, energy saving. 2, three-dimensional knitting heart structure, the disc more closed more tight, reliable sealing performance, achieved without leakage. 3, high pressure, corrosion resistance, wear resistance and long service life. Third, the use of standard design standards: GB / T12238-1989; JB / T8527-1997 flange size: GB / T9113.1-2000; GB / T9113.2-2000GB / T9115.1-2000; GB / T9115.2 -2000 length of the structure: GB / T12221-1989 pressure test: GB / T13927-1992; JB / T9092-1999 Executive body with new series GT / AT pneumatic actuator, double acting and single acting (spring return ), gear transmission, safe and reliable; large diameter valves adopt series AW pneumatic actuator fork-type transmission, reasonable structure, the output torque, a double-acting and single-acting 1 dual-piston gear, the output torque, volume small. 2, the choice of aluminum alloy cylinder material, light weight, beautiful appearance. 3, at the top, bottom installation manual operating mechanism. 4, the rack connector opening angle can be adjusted, the rated flow. 5, the actuator feedback signal indicates the optional charging and various annexes to automate operations. 6, IS05211 standard connection provides easy installation replacement product. 7, both ends of the adjusting screw allows the standard product section at 0 ° and 90 ° adjustable range of ± 4 °. Ensure the accuracy of synchronization with the valve. Five selectable options annex the following accessories according to different control and requirements: cut-off Accessories: single solenoid valves, double solenoid valves, limit switch back to the hearing. Modulating Accessories: Electrical locator, pneumatic positioner, electrical converters. Gas processing Accessories: Air filter regulator, Gas processing FRL. Manual mechanism: HVSD handheld agency Model: D643H-16C / P / R / RL, D643H-25C / P / R / RL, D643H-40C / P / R / RL Related Keywords: pneumatic valve, pneumatic valve flange pneumatic multi-level butterfly