On some engines it is located on the top or
at the side of the cylinder and will work equally well. The plunger is
connected with the cross head and in direct line with the pump barrel,
and plays back and forth in the barrel. The vertical check valve is
placed between the pump and the water supply. It is not absolutely
necessary that the first check be a vertical one, but a check of some
kind must be so placed. As the water is lifted up to the boiler it is
more convenient to use a vertical check at this point. Just ahead and a
few inches from the pump barrel is a horizontal check valve. Following
the course of the water toward the point where it enters the boiler, you
will find another check valve. This is called a "hot water check." just
below this check, or between it and where the water enters the boiler,
you will find a stop cock or it may be a globe valve. They both answer
the same purpose. I will tell you further on why a stop cock is
preferable to a globe valve. While the cross head pumps may differ as
to location and arrangement, you will find that they all require the
parts described and that the checks are so placed that they bear the
same relation to each other.
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