Our Train Horns
Pneumatic Warning Horn: Design, Operation and Manufacturing
Composition of the Warning Horn
Locking Nut Ensuring Mechanical Assembly
The locking nut plays a critical role in the assembly of the warning horn. It ensures precise and secure mechanical connection between the acoustic body and the horn bell.
The nut is tightened to a controlled torque using a calibrated torque wrench in order to:
- apply optimal pressure to the diaphragm
- ensure repeatable acoustic performance
- prevent any drift in adjustment over time
Once tightened, the nut is marked to indicate assembly completion and to allow immediate identification of any subsequent disassembly.
This assembly method directly contributes to acoustic quality, operational safety and long-term durability of the warning horn.
Acoustic Body with Integrated Vibrating Diaphragm
The acoustic body is the central component of the pneumatic warning horn. It receives compressed air and converts pneumatic energy into acoustic vibration.
Inside the acoustic body is a vibrating diaphragm, specifically designed to oscillate under air pressure. This diaphragm generates the primary sound wave, which is then amplified and directed by the horn bell.
The acoustic body is designed to:
- ensure high mechanical stability
- guarantee consistent acoustic response
- withstand the stresses associated with intensive industrial use
Its design enables reliable and consistent operation, even in environments subject to variations in pressure, temperature or humidity.
Brazing
- brazing of the horn bell and branch in brass (two-piece horn bells)
- brazing of the fitting onto the brass horn bell
Painting
- brass horn bells
- acoustic bodies
Screwing / Torque Tightening
- acoustic bodies
- horn mounted onto the acoustic body after installation of the locking nut
We are equipped with a semi-anechoic chamber for the adjustment of warning horns. A sound level meter and dedicated acoustic software are used to measure sound pressure level (dB) and fundamental frequency.
Our Class 1 sound level meters are calibrated annually by a certified laboratory.
The following process is applied to every warning horn, ensuring complete traceability:
1
Manual adjustment of the horn on a test bench under the specified air pressure
2
Tightening of the locking nut using a torque wrench
3
Application of a blue marking to indicate tightening and to identify any future disassembly
4
Serial numbering of the warning horn and digital recording of measured acoustic performance
