Dual-circuit Brake Valve

Assignment

The dual-circuit brake valve should enable a gentle operation of the compressed-air brake. It is also known as brake-pedal brake valve. Depending on the deflection of the brake-pedal, the operating pressure increases steadily in both brake circuits separately. These pressure-increase rates are legally stipulated. At the same time, the resistance force of the pedal must also steadily increase.

Function

Partial braking
The force is transferred from the pedal through a push-rod to the piston. From there it goes through a rubber distance compensation spring to the reaction piston. On its way down, this allows, at first, compressed-air to flow into the first brake circuit. The same thing happens below with the second brake circuit because in addition, it presses the cradle piston downwards.

Through the compressed-air flowing into the brake circuits an an opposing force is developed, which presses the reaction piston upwards against the distance compensation spring. At a certain pressure, depending on the pedal travel, this connection is closed. According to the pressure on the brake, an opposing force is evident on the brake-pedal.

Full braking
The brake pedal is fully depressed. Through the valve, the cradle piston is pressed downwards by the reaction piston. Both brake circuits are supplied with the full amount of stored pressure. 05/10