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Low Noise Pumps
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Where Pump Noise Comes From
- Pressure ripple: every pump delivers oil in small pulses, and those pulses shake the pipes and valves downstream.
- Structure borne noise: vibration passes through the motor, bell housing, frame and tank, which then act like loudspeakers.
- Airborne noise: sound radiated straight from the pump and motor.
- Cavitation and aeration: bubbles in the oil collapse with a harsh rattle and damage the pump.
A quiet pump tackles the first and third. A quiet system tackles all four.
Quiet Pump Designs
- Internal gear pumps: smooth, low ripple flow and very low noise. A popular choice for machine tools and injection moulding.
- Balanced vane pumps: quiet and compact, with balanced loads that keep the bearings happy.
- Screw pumps: almost pulse free, and used in lifts and other noise sensitive places.
- Low noise axial piston pumps: some designs use more pistons and special porting to cut ripple at higher pressures.
This range brings the quiet options together. To learn how each design works, see its own pump type page.
Decibels in Plain Terms
- Every 3 dB doubles the sound energy.
- Every 10 dB sounds roughly twice as loud.
- In Australia, the workplace exposure standard is 85 dB(A), averaged over eight hours.
Swapping a noisy external gear pump for an internal gear or vane pump can cut several decibels. Fixing the mounting and pipework can cut several more.
A Quieter System, Not Just a Quieter Pump
- Run slower. A larger pump at lower speed is usually quieter than a small one running flat out, and variable speed drives slow the pump when demand drops.
- Use a damped coupling and bell housing to stop vibration reaching the frame.
- Fit anti-vibration mounts under the motor and pump.
- Use a short length of hose at the pump outlet instead of rigid pipe, to break the vibration path.
- Size the suction line generously, so the pump never starves and cavitates.
- Keep the oil clean and free of air, with a well baffled tank.
Low Noise Pumps Specifications to Check
- Noise level in dB(A), plus the speed and pressure it was measured at
- Displacement and pressure rating for your duty
- Pump type: internal gear, vane, screw or piston
- Shaft, flange and port details for replacements
- Drive: fixed speed motor or variable speed drive
Always compare noise figures at the same speed and pressure. A figure measured at low pressure tells you little about a press running at 250 bar.
Where They Work
Low noise pumps suit machine tools, injection moulding machines, passenger lifts, hospitals, test labs and any power unit that lives inside a building rather than a plant room.
Why Buy From TSA Hydraulics Engineering
As a low noise pumps supplier, we look at the pump and the installation together, so the quiet result holds up on site. You get clear prices in AUD, OEM or equivalent options, and help sourcing low noise pumps replacement parts such as seal kits, cartridges and couplings. We tell you upfront whether a pump is genuine or an equivalent.