2011 Professional Knowledge Morning, Question 15
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15. When the operating flow rate of the pump is 20% below the rated flow rate, a low-flow bypass circuit should be provided to allow part of the fluid to circulate, thereby improving the pump’s efficiency. Appropriate facilities generally need to be installed on the bypass pipeline. Which of the following facilities is the most cost-effective? A. Control valve B. Magnetic valve C. Ball valve D. Flow restriction orifice. What is the principle behind making this choice? Why can’t I find it?
It’s all for achieving flow restriction, and among these, the flow restriction orifice plate is the cheapest
Thank you:handshake
Throttle orifice plates can be used to protect pipelines from low flow rates, as specified in HG/T20570