Sauer Danfoss PV23 Control Valve

Sauer Danfoss PV23 control valve

By setting the position of the knob on the electronic control unit TME, a pulse width modulated (PWM) current signal is given, which in turn drives the output of the proportional pressure reducing valve on the TMP. The charging pressure oil provided by the charging pump acts on the variable servo piston after being adjusted by the proportional pressure reducing valve. Due to the proportional pressure reducing valve control characteristics, the output pressure is proportional to the control current.

Sauer Danfoss PV23 control valve can accurately obtain the pressure acting on the servo control piston by adjusting the control current of the proportional pressure reducing valve to control the angle of the swash plate to complete the pump displacement control.

The output flow of the pump is related to the input speed, which directly affects the output speed of the motor, that is, the speed of the reducer TMG. In the TM system, the drum speed of the mixer is required to keep the set speed constant regardless of the engine speed/pump input speed or load state.

In order to meet the above-mentioned constant speed requirements of the drum, the TM system adopts closed speed control. The actual drum signal is obtained by the speed sensor on the reducer TMG and used as the closing control feedback signal of the electronic control unit TME. By comparing the feedback value of the drum speed with the control set value, the TME fine-tunes the proportional pressure reducing valve control current signal accordingly to realize the change of the TMP swash plate within the geometric angle range. Finally keep the drum speed constant. The system fully meets the constant speed control requirements of the mixer drum, and the constant speed setting value is set by the knob on the electronic control unit TME.

The TMP integrates the charge pump, and realizes the charge and overpressure protection of the closed circuit through a multi-function valve. The charge pressure oil enters the system through the low pressure side of the circuit, and supplements the cooling and cleaning oil discharged from the system through the circuit flush valve. A loop flush valve is integrated on the motor, which consists of a shuttle valve and a flush relief valve with an orifice. The working hydraulic oil of the closed oil return part is discharged from the system through the loop flush valve, and at the same time, the replenishment pressure oil passing through the oil suction filter enters the system through the one-way relief valve.

Sauer Danfoss PV23 control valve realizes the circulating cooling and filtration of hydraulic oil in closed return oil.

When the system is initially started, the air in the pipeline is quickly discharged from the system through the high-pressure relief valve and the loop flush valve. At the same time, it should be ensured that when the vehicle is initially started, those unavoidable "installation pollutants" are discharged from the closed circuit and adhere to the system filtration system.