Özet:

Butterfly valves, which are designed to enable the installations to open and close quickly in the valve industry and thus reduce water and energy loss, take their names from the placement of the disc and shaft. Although alternative methods such as rilsan or epoxy coating are used in order to increase the low corrosion resistance of commonly used ductile cast iron disc materials, it impossible to reach the required corrosion resistance with these options, and it has been determined that the valve cannot fully fulfill its sealing functions. Stainless steel discs, which are used to increase corrosion resistance and improve sealing functions, are not preferred because of long lead times, high costs and machining difficulties. Bronze discs are of critical importance due to their low cost, short lead times and easy machining. Moreover, it is widely preferred in sector to increase the corrosion resistance and fulfill the sealing functions by coating the parts of the ductile cast iron body materials that come into contact with the corrosive environment with rubber material. In this study, ductile cast iron body design of Lug-Wafer type butterfly valves, simulation-supported designs of the production of bronze discs by hot forging method and prototype production stages are discussed, the effects of the pressed EPDM coating dimensions on the wet torque were investigated with the experimental design to ensure the sealing on the body contact surfaces and the disc, and the optimum wet torque value of the system was determined.

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