Hydraulics and Pneumatics: Unit III: Hydraulic Circuits and Systems

speed control of a hydraulic motor

Hydraulic Circuits and Systems - Hydraulics and Pneumatics

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Fig.8.21 illustrates a circuit that can be used to control the speed control of a hydraulic motor.

SPEED CONTROL OF A HYDRAULIC MOTOR

1. Circuit

Fig.8.21 illustrates a circuit that can be used to control the speed control of a hydraulic motor. This circuit uses a pressure-compensated flow control valve and a manually-operated spring-centered 4/3 D€ valve (tandem design).

2. Operation

Left envelope position : When the 4/3 DC valve is manually shifted to the left mode, the oil flows from the pump to the hydraulic motor through the flow control valve. This oil flow rotates the motor in one direction. Here it may be noted that the speed of the hydraulic motor, can be varied infinitely by adjusting the setting of the throttle of the flow control valve. The excess oil (while controlling the flow in the flow control valve) is returned to the oil tank through the pressure relief valve.

Right envelope position : When the 4/3 DC valve is manually shifted to the right mode, the oil flow rotates the hydraulic motor in the opposite direction. Here also the motor speed can be varied infinitely by adjusting the setting of the throttle of the flow control valve.

Spring-centered position: When the 4/3 DC valve is shifted to its spring-centered position, the motor is hydraulically locked.

Hydraulics and Pneumatics: Unit III: Hydraulic Circuits and Systems : Tag: : Hydraulic Circuits and Systems - Hydraulics and Pneumatics - speed control of a hydraulic motor

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ME3492 4th semester Mechanical Dept | 2021 Regulation | 4th Semester Mechanical Dept 2021 Regulation