Life expectancy: butterfly valve in use more than 10,000 times, still able to guarantee the closure of the "airtight." Pressure drop: If the pressure drop is too large, it will increase the energy consumption. However, it should be noted that the valve is not the only cause of pressure drop in the piping system, resulting in the pressure drop as well as the following factors. Pipeline fluid cross section. Pipe wall friction. Flow through the parts change. Butterfly valve fluid properties equivalent to three times the cut-off valve or even higher, equivalent to 75% of the same size gate valve. Versatility: Butterfly valves control and regulate the piping system by opening / closing and throttling / balancing. Butterfly valves have better "versatility" than gate valves or globe valves. Because the butterfly valve can use a variety of surface treatment technology and the choice of flexible material pipe, so the butterfly valve has a very strong chemical corrosion resistance. Weight: The lightweight butterfly valve saves installation costs over heavy duty cast iron valves: for example, a butterfly valve with a nominal 10-inch diameter weighs 55 pounds and a 10-inch cast iron gate valve weighs as much as 490 pounds. For the entire pipeline system, the use of butterfly valve saves installation costs is very impressive. In addition, the heavier the piping system, the stronger the piping support base is and therefore the more expensive the entire piping system. Therefore, taking into account the weight of the valve, you can save the cost of the entire pipeline system. Size: Butterfly valve space is about the same size gate valve 1/6. For every additional cubic foot of building space, this means a waste of costs. For example, a butterfly valve with a nominal 10-inch diameter is about 21 inches high and a gate valve with a nominal 10-inch diameter is as high as 43 inches. Gas-tight shutoff: Gate valves and stop valves (metal-to-metal connections) do not have airtightly closed seats. Easy to operate: The butterfly valve only needs to rotate 1/4 turn (90 degrees) from opening to closing. The gate valve and globe valve need to turn a lot of turn to the valve from the open state into a closed state. Easy to open or close means that you do not need to hire a paid operator to operate a butterfly valve. Cost: The cost of a butterfly valve is usually only 40% of cast iron gate valve, not only the purchase cost is low, and the installation cost is relatively low. Maintenance: As the butterfly valve has a high six-factor and good performance of the flexible seat, so the butterfly valve with automatic cleaning function, reducing the pipeline was debris debris junk.