A stop cock should be used next to boiler, as you ascertain whether it
is open or shut by merely looking at it, while the globe valve can be
closed by some meddlesome party and you would not discover it, and would
burst some part of your pump by forcing water against it.
PART THIRD _________
It is very important when the pump fails to work to ascertain what the
trouble is. If it should stop suddenly, examine the tank and ascertain
if you have any water. If you have sufficient water, it may be that
there is air in the pump chamber, and the only way that it can get in is
through the stuffing box around the plunger, if the pipes are all tight.
Give this stuffing nut a turn, and if the pump starts off all right, you
have found the trouble, and it would be well to re-pack the pump the
first chance you get.
If the trouble is not in the stuffing box, go to the tank and see if
there is anything over the screen or strainer at the end of the hose.
If there is not, take hold of the hose and you can tell if there is any
suction. Then ascertain if the water flows in and then out of the hose
again.
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