Young Engineer's Guide

by J. V. Rohan

TO SET VALVES OF DUPLEX PUMP.

Set the pistons at mid-stroke, and set the valves which are worked from the opposite side at mid-stroke also, and it will be right at all other points. The mid position of the valve can be obtained by moving it back and forth the amount of its lost motion, and dividing it so that the lead or opening on both sides will be the same.