Butterfly has a simple structure, small size, light weight, material consumption province, installation of small size, fast switching, 90 ° reciprocating rotary valve price, driving torque characteristics of small valve parts, used to cut, turn, adjust the line of medium valve manufacturer, having good fluid sealing properties and closing control characteristics. Butterfly can carry mud accumulation of fluid in the pipe mouth least. Under low pressure, can achieve a good seal. Regulation performance. The streamlined design of the valve disc, so that the loss of fluid resistance, can be described as an energy-saving products. First, due to the multi-Flex stacked ring fixed in the valve plate, when the valve plate normally open state media to form a positive sealing surface erosion, and metal sandwich of soft seal by brushing with a direct impact on sealing performance. Second, the structural conditions by limiting the structure do not meet the following path DN200 valve, the valve plate because the overall structure of thick, large flow resistance. Third, because the principle of the three eccentric structure, the sealing surface of the seat between the valve plate by the transmission of torque to the valve plate is pressed against the valve seat. Positive flow state, the higher the pressure medium sealed tight squeeze. When countercurrent flow medium with medium pressure increases between the valve plate and seat when positive pressure is less than medium pressure, the seal began to leak. Valves, fittings _ Ming Port Valve (certified) _ valve valve provided by the Hong Kong Science and Technology Co., Ltd., Dongguan Ming. Port Valve Co., Ltd., Dongguan Ming (www.gdmgfm.com) is Dongguan, butterfly leaders, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the next port of the valve leading the staff warmly welcome all inquiries negotiations to create the next port of the valve a better future.