This section provides an overview for manual hydraulic pumps as well as their applications and principles. Also, please take a look at the list of 10 manual hydraulic pump manufacturers and their company rankings.
A manual hydraulic pump is a hydraulic pump that can be operated manually. Manual hydraulic pumps are useful because they can be used at sites where power is not available, but they must be handled with care.
By pushing down the long handle toward the main body, pressure is applied to the shaft of the handle, and the pressure is transmitted to the discharge section through the inside of the main body, enabling the pump to discharge grease, etc. stored in the tank inside the main body.
Manual hydraulic pumps are used for greasing rotating equipment, such as electric motors. They are also used for greasing coolers in building air conditioning systems, where the distance between the rotating equipment and the grease inlet is relatively long.
Manual hydraulic pumps can apply relatively high pressures, with a maximum working pressure of 70 MPa (= 713.8 kg/㎠) in general, making it possible to pour even viscous grease-like fluids.
Manual hydraulic pumps are also available with two-stage switching or variable discharge pressure, and are used in different ways depending on the application.
Manual hydraulic pumps are based on Pascal's principle and the principle of leverage.
Pascal's principle states that "a pressure F (kN)" applied to one point of a fluid filled in a sealed container applies the same value of pressure to the entire inner surface of the container through the fluid.
For example, when the handle of manual hydraulic pumps are pushed down over an area of 1㎠ with a force of 7 kN, 70 MPa (7 kN/㎠≒70 MPa) is transmitted to the entire container in the fluid, and the same pressure of 7 kN/㎠ is applied to the discharge area. How this pressure is related to the discharge volume is related to the pressure-receiving area (㎠) and stroke (cm), so it is necessary to check the respective catalogs.
In addition, by lengthening the handle, manual hydraulic pumps can apply a force of 7 kN/㎠ even to a person without any strength, because the force is inversely proportional to the length of the handle due to the "leverage principle."
Here, the compression ratio is often negligible for liquids, whereas for gases such as air, it may have an effect, and air pumps require consideration of the discharge volume.
*Including some distributors, etc.
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