Operating pressure pmax = 700 bar Delivery flow Qmax = 91.2 lpm (at 1450 rpm) Geometric displacement Vg max = 64.2 cm3/rev. 1. General Hydraulic pumps apply the displacement principle for converting mechanical into hydrostatic energy (DIN ISO 1219-1). The pumps described in this pamphlet are constant delivery pumps. ' Application These pumps serve generally to supply pressuriced fluid to hydraulic consumers in hydraulic systems. The maximum permissible drive power is 30 kW, depending on size. ' Basic types (bearing design) R - Traditional version, where the eccenter is a roller bearing, suited even for very low speed ratings RG - New version, where the eccenter is a slide bearing, suited for fluids with bad lubrication characteristic (e.g. HFC) but not for low revolution ratings as this would prevent the generation of the necessary lubricating film. ' Mechanical design Radial piston pumps are valve controlled with cylinders in a radial arrangement. The cylinder radials in one, two or several superimposed layers (stars) are driven by bearings fitted eccentrically on the drive shaft (piston pressure stroke), then being returned to their idle position by springs (piston intake stroke).The fluid being delivered by the various cylinders is collected via manifolds feeding one joint pressure port. The pump housing shells are load-bearing elements supporting the cylinders and shaft bearings. The pumps run very smoothly as the drive shaft is statically balanced via counter weights. With the exception of the single- and double-cylinder pumps, there is always an uneven number of pistons per cylinder radial, which minimizes any pulse effect on the pump delivery. hawe radial piston pump pdf hawe pump hawe hydraulic pump hawe type r hawe pump catalogue hawe piston pump radial piston pump manufacturer