Sound Insulation for Pneumatic Knockers Type K

Noise Reducing Version Pneumatic Knocker Type K-V1 (Vulkollan)

Undamped knockers reach sound levels of 95 to 100 dBA.
Our special version of the Pneumatic Knocker Type K-V1 is equipped with a striker of vulkollan (PU).
In addition the Sound Insulation Plate made of vulkollan (Type AP-SD), is clamped between welding plate and knocker. The noise development is decreased by approximately 5 dBA, this marginally reduces the effect of the knocker.

Sound Insulation Hood

Sound levels can be reduced with the use of insulation. The following devices are available from us:


Sound Insulation Hoods – KSH

The Sound Insulation Hood (KSH) is placed over the Pneumatic Knocker and bolted on with an extension to the middle bolt of the knocker.

A rubber edge protection profile is affixed on the contact surface of the silo, which adapts to the contours of the silo.
For smaller silos the metal sheet of the sound insulation hood is adapted to shape.
There may be no air gap between the silo wall and the Sound Insulation Hood, otherwise the sound insulation is considerably reduced.

The Sound Insulation Hood is equipped with a rubber bushing for the compressed air hose and with sound absorbers for the purge air.

Sound Insulation Plates – KSP

The Sound Insulation Plate (KSP) insulates the sound radiation from the container in the vicinity of the knocker, without dampening the vibrations generated by the knocker.
The Sound Insulation Plates are cut out in the middle in order to fit over the Sound Insulation Hood (KSH). During mounting, the protective paper is removed and the Sound Insulation Plate is pressed to the silo wall. In case of a larger area needs to be sound-proofed, we then supply Sound Insulation Plates (SP) made of the same material.