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Technical Innovations
Linde introduces 21° hydraulic pumps
and motors
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The HMF02 high-pressure hydraulic motor series features Linde's patented 21° technology.
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Linde Hydraulic Corp. has introduced a new series of high-pressure hydraulic motors, the HMF02, that is based on the company's patented 21° technology. The new motor design is extremely compact while delivering a higher power density than conventional designs. The series offers 50 MPa (7250 psi) peak-pressure capability, continuous operating pressure of 42 MPa (6100 psi), and a nominal operating pressure of 34.5 MPa (5000 psi). The increased power per pound results in a smaller hydraulic package.
This swash-plate-type, fixed-displacement motor series features the Linde's revolutionary 02 rotating group, which provides performance levels equal to or better than comparably sized bent-axis designs. Six models make up the HMP series, from 28 to 135 cm3 /rev (1.7 to 8.2 in3 /rev), for either open- or closed-loop applications. Options that make it easily adapted to either application include: choice of ANSI or SAE spline shafts, purge/flushing ability to maintain oil temperature, high-pressure relief valves, and ISO high-pressure axial- or radial-port locations.
Linde engineers designed the 02 hydraulic line to lead the industry in reliability and be cost competitive. The line's modular design and high degree of interchangeable components help to lower manufacturing and inventory costs. For instance, the new rotating group is interchangeable with same-size open- and closed-loop pumps and motors.
Many of the features of the new 21° series were pioneered by Linde's previous generation of B-Series swash-plate pumps and bent-axis motors and the 01 Series open-loop pump. Furthermore, the 21° series has been field tested and operational in select applications since 1994 and was field proven prior to being released for general application.
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