The valve can then be taken out and the obstruction
removed. Be very careful never to take out the hot water check without
closing the stop cock, for if you do you will get badly scalded; and
never start the pump without opening this valve, for if you do, it will
burst the pump.
The obstruction under the valves is sometimes hard to find. A young man
in southern Iowa got badly fooled by a little pebble about the size of a
pea, which got into the pipe, and when he started his pump the pebble
would be forced up under the check and let the water back. When he took
the check out the pebble was not there, for it had dropped back into the
pipe. You will see that it is necessary to make a careful examinations
and not get mad, pick up a wrench and whack away at the check valve,
bruising it so that it will not work. Remember that it would work if it
could, and make up your mind to find out why, it don't work. A few years
ago I was called several miles to see an engine on which the pump would
not work. The engine had been idle for two days and the engineer had
been trying all that time to make the pump work.
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