To provide an improved pump of vertical shaft type which does not require to pour in a pressurized lubricating water always from outside into a packing box, as otherwise required according to the conventional technique, to lead to enhancement of the economical efficiency and elimination of corrosion of a water pour-in pipe or its clogging with foreign matter.
A vertical shaft pump is structured so that its shaft is sealed by a gland packing 4 and the pressure in the gland part lies approx. in the middle between a positive and a negative pressure, wherein the gland packing 4 is installed in that position within the gland part which becomes a positive pressure at all times, and thereby the amount of lubricating water leaking at a gland leak pipe 7 installed over the gland packing 4 is sensed, and only when no lubricating water leaks from the gland leak pipe 7, lubricating water is poured in from the gland seal pipe 6 provided under the gland packing 4.
SHINPO HIROMITSU