Refer to the drawing of a valve motor control circuit (see figure below) for a valve that is currently fully closed and has a 10-second stroke time.
Note: Limit switch (LS) contacts are shown open regardless of valve position, but relay contacts are shown open/closed according to the standard convention for control circuit drawings.
An operator takes the control switch to OPEN momentarily and the valve begins to open.
Five seconds later, the operator places and holds the switch in the CLOSE position.
Which one of the following describes the valve response with the switch held in the CLOSE position?
A. The valve will stop opening and remain partially open.
B. The valve will stop opening and then go fully closed.
C. The valve will open fully and remain fully open.
D. The valve will open fully and then go fully closed.
Show Answer
Answer: D
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