The first step when resetting the slide valves on a duplex reciprocating pump is to __________.

Correct Answer: Option B — place the steam pistons in the mid-stroke position

Setting the steam pistons to mid-stroke is the mandatory starting point for timing duplex pump slide valves. This position ensures that the valve gear is centered, allowing the engineer to accurately adjust the lost motion and ensure that the steam ports open and close at the correct intervals.