Hydraulic vibration dampers - structure-borne sound absorbers
Hydraulic noise damper for fluid systems
Unpleasant noises can occur in hydraulic lines, which can have two causes:
- Changing flow rates generate pressure surges and thus loud impacts. The use of a hydraulic accumulator helps here.
- Hydraulic displacement pumps, such as gear or piston pumps, cause a discontinuous, pulsating oil flow, which leads to undesirable vibrations and high sound waves. To prevent this problem, Hänchen offers the hydraulic silencer, also known as vibration and structure-borne sound absorber.
- Smooths the fluid flow
- Reduces disturbances to the sensor technology
- Minimises noise pollution
- Easy integration into the fluid circuit
Functionality of the hydraulic noise silencer
This is how vibrations are dampened in pipes
The pulsating oil flow coming from the pump is routed through the vibration and structure-borne sound absorber, where it is split into a multitude of partial flows. Each of these individual flows causes turbulence in the oil flow. This multiple reflection smooths the total oil flow, meaning that the amplitude of the vibration is reduced almost to zero, so that a low-pulsation oil flow emerges from the hydraulic silencer. The conversion of the vibration energy occurs with virtually no loss. The flow resistance is less than 1 bar.
Vibration dampers are particularly effective at frequencies between 150 Hz and 2,000 Hz.
The hydraulic vibration absorbers or structure-borne sound dampers from Hänchen are maintenance-free.
Installation prerequisites
Quick installation
Vibration and structure-borne sound absorbers are installed directly in the pressure pipeline, as close as possible to the pump. They can be installed in any position, but the outlet port must always be at the highest point so that the hydraulic silencer vents itself.
The inlet port is connected to the pump via a pressure-resistant hose and the outlet port to the continuing pipeline. The minimum hose length is 900 mm; for nominal diameters of the line below 18 mm, a length of 600 mm is sufficient. Tight hose bends should be avoided.
The Hänchen vibration dampers or structure-borne sound absorbers are supplied with mounted elastic damping side lugs for mounting.
Technical data of the vibration and structure-borne sound absorbers
Damping noise in hydraulic lines
Temperature: -20 °C to +200 °C
Flow resistance: < 1 bar
Fluids: mineral oil, stainless steel version on request
| Flow rate [l/min] |
Pressure (bar) |
Outer-Ø (mm) |
Length (mm) |
Port | Weight (kg) |
| 30 | 160 | 320 | 60 | 70 | 235 | 265 | G ½ | G ¾ | 2.5 | 5.5 |
| 80 | 160 | 320 | 95 | 108 | 320 | 370 | G 1 | G 1 ¼ | 7.7 | 17 |
| 200 | 160 | 320 | 160 | 180 | 415 | 474 | G 1 ½ | 26 | 55 |
| 400 | 160 | 320 | 200 | 236 | 475 | 535 | G 2 | 43 | 110 |
Note
Vibration and structure-borne sound absorbers are not suitable for damping switching or acceleration shocks in hydraulic systems or for damping vibrations caused by oscillating non-return valves, undamped pressure-limiting valves, etc.