Abstract: A centrifugal cast caliber roll for a hot rolling mill has excellent abrasion resistance, fatigue resistance, and slip resistance. The roll has a chemical composition containing, by mass %, C: 1.8% or more and 3.0% or less, Si: 0.2% or more and 1.0% or less, Mn: 0.2% or more and 1.5% or less, Cr: 5% or more and 9% or less, Mo: 4.0% or more and 7.0% or less, V: 4.0% or more and 7.0% or less, Nb: 0.5% or more and 2.0% or less, and the balance being Fe and inevitable impurities, in which the relationship 0.6?(C?0.24V?0.13Nb)?1.4 (where C, V, and Nb each denote the content (mass %) of the corresponding chemical element) is satisfied, and has a surface hardness of Hs 67 or higher and Hs 76 or lower in terms of shore hardness.

Abstract: A dialysis device 1 includes a water supply passage 15 for supplying clean water to solution supply chambers 35a and 35b, and a waste solution passage for discharging a used dialysis solution from solution collection chambers 34a and 34b, and the water supply passage includes a concentrate solution pump 21 that supplies a dialysis concentrate solution from concentrate solution supply source 19. The concentrate solution pump is a piston pump 40 that moves a piston 42 up and down in a cylinder 41 to feed a solution, the piston pump is provided in the way of washing passage 26 provided between the water supply passage and the waste solution passage, and an open/close valve 27 that intermittently opens and closes is provided in the washing passage to flow the clean water in the water supply passage through a gap between the cylinder and the piston.

Abstract: A dialysis device 1 includes a water supply passage 15 for supplying clean water to solution supply chambers 35a and 35b, and a waste solution passage 17 for discharging a used dialysis solution from solution collection chambers 34a and 34b, and the water supply passage includes a concentrate solution pump 21 that supplies a dialysis concentrate solution from a concentrate solution supply source 19.