In Figs. [102] and [103] are exhibited the outlines of the double acting steam pump, which is undoubtedly the pattern most thoroughly adapted for feeding steam boilers, as it is equipped for the slowest motion with less risk of stopping on a centre.
From the drawing with reference letters may be learned the terms applied generally to the parts of all steam pumps: example: “k” shows the water valve stems, “K” the water cylinder heads.
It may be remarked that nearly all pump makers furnish valuable printed matter, giving directions as to repairs, and best method of using their particular pumps—especially valuable are their repair sheets in which are given cuts of “parts” of the pumps. It were well for the steam user and engineer to request such matter from the manufacturers for the special pump they use.
POINTS RELATING TO PUMPS.
Blow out the steam pipe thoroughly with steam before connecting it to the engine; otherwise any dirt or rubbish there might be in the pipe will be carried into the steam cylinder, and cut the valves and piston.
Never change the valve movement of the engine end of the pump. If any of the working parts become loose, bent or broken, replace them or insert new ones, in precisely the same position as before.
Keep the stuffing boxes nearly full of good packing well oiled, and set just tight enough to prevent leakage without excessive friction.
Use good oil only, and oil the steam end just before stopping the pump.
It is absolutely necessary to have a full supply of water to the pump.