02

2019-04

02

2019-04

Precautions for Using Hydraulic Motors

1. When the driven component has a large moment of inertia and it is required to achieve braking or forward/reverse motion within a short time, a safety valve should be installed in the return oil circuit to provide cushioning, thereby preventing sudden hydraulic shocks that could lead to damage or accidents. 2. When using a fixed-displacement motor, if smooth starting and stopping are desired, the circuit design should incorporate appropriate pressure control or flow control methods. 3. When a hydraulic motor is used as a power source for lifting equipment or locomotion systems, a speed-limiting valve must be installed to prevent heavy objects from falling rapidly or vehicles or other moving mechanisms from overspeeding when descending slopes, which could result in serious accidents. 4. Since hydraulic motors always have leakage, even if the inlet and outlet ports of the hydraulic motor are closed to achieve braking, there will still be a slow slip. Therefore, when prolonged braking is required, an additional brake mechanism designed to prevent rotation should be provided separately. 5. When starting under full load is necessary, attention should be paid to the value of the hydraulic motor’s starting torque, as the starting torque of a hydraulic motor is always lower than its rated torque. Ignoring this fact could prevent the working mechanism from operating properly. 6. Because the backpressure (outlet pressure) of the hydraulic motor’s return line is always higher than atmospheric pressure, the motor’s drain line must be routed directly back to the oil tank and cannot be connected to the hydraulic motor’s return oil line.

Apr 02,2019

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