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154. Suppose the pilot pressure range is from 3 to 15 psig for the illustrated pneumatically operated diaphragm actuated control valve. Assuming the control valve is trimmed for a linear response and the travel position indicator is calibrated in percentage, what would be the approximate valve position with a 9 psig pilot pressure
A 9 psig pilot pressure corresponds to 50% valve travel because it is the midpoint of the 3-15 psig signal range, which represents 0-100% valve travel for a linearly trimmed valve.
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