Abstract: A canned motor pump having improved dielectric strength at a high temperature above 200.degree. C. is disclosed in which a jacket is arranged on an outer wall of the canned motor section, to an inlet port of which jacket is supplied a portion of pressurized liquid to be treated, while an outlet port of said jacket is connected to a lower pressure zone of the pump section or pump tubing system to circulate the liquid thereto. In accordance with the canned motor pump, the efficient cooling of the canned motor and the economically advantageous pump system without energy loss may be achieved.

Abstract: A canned motor pump is adapted for use at high temperatures and enables generated heat from the motor to be absorbed in a treating fluid or liquid upon circulation through the motor thereby conserving heat values in the treating fluid or liquid. The canned motor pump can circulate high temperature treating fluids, or liquids through the canned motor portion without damaging the coils of the motor because of a ceramic-like high temperature insulation used for the electrical field windings, which insulation is provided by mixing a silicone resin, synthetic fluoro-mica and a devitrified mica glass and impregnating the electrical winding coils with such material, whereafter the material is cured and then subjected to an elevated temperature above 300.degree. C. to form the ceramic-like insulation.

Abstract: An axial flow inducer for hydraulic devices is disclosed. The inducer is coaxially arranged in front of a fluid suction inlet side of a main impeller of an hydraulic device, for example, a pump and constituted by at least two axial flow blade parts which are constructed and arranged so as to prevent an occurrence of noise over all flow amount region of the impeller.