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Enhancing Train Reliability:

Improved Anti-Compound Valve Design

To address a potential issue with unintended brake application during

train movement, an innovative modification has been made to the

design of the Anti-Compound Valve (ACV) in the Train Brake Unit

(TBU).
Previously, the ACV relied solely on proper priming and vulcanization of

the valve cup unit, which had a uniform wall thickness. This design

presented a risk of the valve cup unit detaching and causing
unintended brake application. To address this concern, the new ACV

design incorporates a two-pronged approach. Firstly, the vulcanization

process with proper priming remains in place for optimal sealing.
Secondly, a crucial safety feature has been added - a positive locking

mechanism. This mechanism utilizes a reduced diameter at the inside

of the valve cup brass sleeve, creating a secure fit and preventing the

valve cup from detaching. Additionally, the NBR rubber core, previously
used in the valve cup unit, has been replaced with a more robust

Silicon material, enhancing overall performance and reliability. This

improved ACV design minimizes the risk of unintended brake

application, ensuring smoother and safer train operations for all
passengers.