The single pipe braking system is mainly composed of hydraulic pump, overflow valve, filter, single pipe energy storage and filling valve, pressure switch relay, accumulator, brake light interface relay, single pipe regulating brake valve, brake and connecting pipeline. The system can share the same pump source with other hydraulic systems of the vehicle. The constant current pump can be selected for the single pipe braking system according to the needs. The single pipe charging valve is composed of pressure compensation valve a, check valve and charging valve B.
When the main pump is working, the high-pressure oil enters the P port of the accumulator charging valve after passing through the filter, and fills the accumulator through the check valve. Due to the nitrogen pressure in the accumulator, the nitrogen is compressed during the charging process, and the pressure in the accumulator increases. When the pressure reaches the minimum pressure set by the spring of the charging valve, the charging valve core starts to move to the right. When it reaches the maximum pressure, the filling valve core reverses to cut off the filling pressure. At the same time, the control oil circuit at the left end of the compensation valve is connected with the oil tank. The oil pressure at the right end overcomes the spring force at the left end of the compensation valve to make the valve core move to the left and reverse. The hydraulic oil of the main pump goes to other circuits to complete the charging of the accumulator. When the pedal of the regulating brake valve is operated, the pressure oil of the accumulator directly enters into the brake. With the increase of the control force, the brake pressure increases until the pedal force and the hydraulic feedback force are balanced. Then the vehicle can be braked. When the pedal is released, the force on the pedal disappears, the valve core returns to the free state, the oil in the brake is connected with the oil tank, and the brake is quickly removed.
