30s of last century, the United States invented the butterfly, the 1950s brought to Japan, to 60 years before the widespread use of pneumatic valve generation in Japan, while in China it is a matter of promotion after the 1970s. Operating torque, small installation space and light weight. To DN1000, for example, butterfly about 2T, while the gate of about 3.5T Nanhai Jiujiang valves, butterfly valves and drive easily with a variety of combinations, with good durability and reliability. The disadvantage is that when the rubber sealing butterfly valve for throttling, due to improper use will produce cavitation, the rubber seat spalling, damage from happening. For this purpose 80 years -90 years metal. But how to choose the right they should according to working conditions. Butterfly relationship between the opening and flow, basically linearly proportional to the change. If used to control the flow, the flow resistance of its flow characteristics and piping is also closely related, such as the installation of two pipelines valve diameter and forms identical Kaiheng valves, and piping loss coefficient is different, the difference between the flow valve will be great. Typically, throttle control and regulate mud medium, requires shorter length of the structure, opening and closing speed (1/4 turn). Low cutoff (pressure difference), recommended use butterfly. In the double-digit adjusted necking ground-channel, low noise, there is the phenomenon of cavitation and gasification, a small amount of leakage to the atmosphere, when the abrasive media with a valve, butterfly valve can be selected. Throttle in special working conditions, or require strict sealing, or badly worn, low temperature (cryogenic) under working conditions, such as when using the butterfly, the need to use a specially designed metal sealing tape adjustment device to three eccentric or double eccentric dedicated butterfly. KITZ valves, valve, the valve is provided by the Hong Kong Ming Ming Port Valve Co., Ltd., Dongguan. Port Valve Co., Ltd., Dongguan Ming (www.gdmgfm.com) strong, credible, butterfly and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the next port of the valve and you hand into the brilliant, for a better future!