Relay Emergency Valve (REV)

The relay emergency valve controls the air brake system of a trailer and provides the "emergency brake function". It's not needed in case the installation contains already a park and shunt valve like TEM, TrCM or TrCM+ with this function. The valve complies with the requirements of EC regulations regarding brake systems. Versions with a predominance device can adapt the braking effect between towing and towed vehicle.