One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； May 19th
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Multiple-choice question: The characteristics of butterfly valves are ( )； However, it cannot be used for precise flow control, as the rubber seal rings tend to age and lose their elasticity ； Butterfly valves are mainly used in low-temperature, low-pressure pipeline systems. A. Simple structure B. Valve body length C. Light weight D. Easy to maintain Answer: ABCD
Fast opening, fast closing; low resistance when opening, short structural length. Poor sealing
The characteristics of butterfly valves are (ABCD)； However, it cannot be used for precise flow control, as the rubber seal rings tend to age and lose their elasticity ； Butterfly valves are mainly used in low-temperature, low-pressure pipeline systems. A. Simple structure B. Valve body length section C. Light weight D. Easy maintenance
The characteristics of butterfly valves are (ACD)； However, it cannot be used for precise flow control, as the rubber seal rings tend to age and lose their elasticity ； Butterfly valves are mainly used in low-temperature, low-pressure pipeline systems. A. Simple structure B. Valve body length section C. Light weight D. Easy maintenance