What Does It Mean When the Percentage of Flow Through a Valve Equals the Percentage of Plug Movement?
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Today’s automation industry quiz question showcases ISA’s new course, Control Valve Mechanics and Operations from Analog to Digital.
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When the percentage of flow through a valve equals the percentage of plug movement, a valve has:
A) Linear flow characteristic
B) Equal percentage flow characteristic
C) Quick opening flow characteristic
D) Curved flow characteristic
E) None of the above
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The answer is A, linear flow characteristic. If a valve with a linear flow characteristic is open to 20% of its maximum, then the flow through the valve is 20% of its maximum. As to an equal percentage valve, choice B, if it were open 20%, the flow would be less than 20% of its maximum. It might be only 5%, for instance. Choice C, quick opening flow characteristic, would describe a valve that lets a lot of flow go through the valve just as it is opening. At 20% of full open for instance, the flow might already be 60% of its maximum-ergo the name quick opening. Choice D is not a flow characteristic.
Source: ISA News