[Production Version] Daily Question 2018-2-21 (Multiple Choice)
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The structural principle of a gate valve is ( ). (A) Using a plug with a hole in the middle inserted into the valve body to open and close the pipeline and regulate flow. (B) Using the raising and lowering of a gate inside the valve body to open and close the pipeline. (C) Using a sphere with an opening in the middle as the valve core, and controlling the opening and closing of the valve by its rotation. (D) Using a circular valve disc to change the distance between it and the valve seat as the valve stem moves up and down, thereby opening and closing the pipeline and regulating flow. Answer: (B)
(D) Utilize a circular valve disc to change the distance between it and the valve seat as the valve stem moves up and down, thereby opening and closing the pipeline to regulate flow rate
(B) Using the raising and lowering of the gate inside the valve body to open and close the pipeline