elements from high to low pressure. Pulsations travel through the hydraulic lines at the speed of sound
(about 1400 m/s [4600 ft/sec] in oil) until there is a change (such as an elbow) in the line. Amplitude varies
with overall line length and position.
Structure-borne noise is transmitted wherever the pump casing connects to the rest of the system. The
way system components respond to excitation depends on their size, form, material, and mounting.
System lines and pump mounting can amplify pump noise. Follow these suggestions to help minimize
noise in your application:
•
Use flexible hoses.
•
Limit system line length.
•
If possible, optimize system line position to minimize noise.
•
If you must use steel plumbing, clamp the lines.
•
If you add additional support, use rubber mounts.
•
Test for resonants in the operating range, if possible avoid them.
Sizing equations
Use these equations to help choose the right pump size and displacement for your application. An
evaluation of the machine system to determine the required motor speed and torque to perform the
necessary work function initiates the design process. Refer to
Selection of drive line components
,
BLN-9985, for a more complete description of hydrostatic drive line sizing. First select motor size to
transmit the maximum required torque. Then select pump as a flow source to achieve the maximum
motor speed.
Fluids
Ratings and performance data are based on operating with hydraulic fluids containing oxidation, rust
and foam inhibitors. These fluids must possess good thermal and hydrolytic stability to prevent wear,
erosion, and corrosion of pump components. Never mix hydraulic fluids of different types.
Technical Information
LPV Axial Piston Pumps
System design parameters
14 |
©
Danfoss | September 2017
520L0954 | BC00000044en-US0102