## 6 Points You Must Know About Hydraulic Pumps

### 1. Displacement

Theoretical displacement.

Theoretical displacement is the volume of liquid discharged by the hydraulic pump per revolution.

Effective displacement.

The effective displacement is the hydraulic volume that is actually discharged per revolution of the pump under specified conditions.

Under the specified minimum working pressure, no-load displacement is the liquid volume discharged by the hydraulic pump per revolution.

### 2. Flow of Hydraulic Pumps

#### Theoretical Flow

Theoretical flow is the volume of liquid discharged by the hydraulic pump per unit time.

#### Effective Flow

The effective flow is the volume of liquid discharged by the pump per unit time.

#### Rated Flow

Rated flow is the flow of the hydraulic pumps under rated conditions.

### 3. Pressure

Rated pressure is the hydraulic pump under normal working conditions, according to the test standard stipulates the maximum pressure of the pump for continuous operation.
Maximum pressure is the maximum peak pressure of the hydraulic oil pump allowed for short-term operation in accordance with the test standard.
Working pressure is the actual working pressure of the hydraulic pump.

### 4. Power of Hydraulic Pumps

Input power is the mechanical power that drives the hydraulic pump, such as engine, motor.
Output power is the output hydraulic power. Its value is equal to the pump of effective flow.

### 5. Speed of Hydraulic Pumps

#### Rated Speed

Rated speed is the maximum speed at which the hydraulic pump can continue to operate normally for a long time under the rated working conditions.

#### Maximum Speed

The maximum speed means the hydraulic pump can exceed the maximum speed that the rated speed allows for short-term operation.

#### Minimum Speed

Minimum speed is the minimum speed at which the hydraulic pump can run under normal working conditions.

### 6. Efficiency

Volumetric efficiency is the ratio of the effective flow output by the hydraulic pump to the theoretical flow.
Mechanical efficiency is the ratio of the hydraulic torque of the hydraulic pump to the actual torque.
The total efficiency is the ratio of the hydraulic power output by the hydraulic pump to the input mechanical power. 