Electric hydraulic pumps compress fluid to drive a secondary mechanism, typically using internal gear or lobe mechanisms and operated at low speeds. They can be driven by AC or DC motors and come in various sizes. Hydraulic pumps draw fluid from a reservoir and deliver it under high pressure to operate positive displacement mechanisms. Electric water pumps are the most common and efficient type, with motors designed for either AC or DC power supplies. They are generally one-piece construction with a flange-type mounting arrangement and come in various sizes and capacities.
An electric hydraulic pump is an electric motor driven device designed to compress a fluid, typically a special grade oil, used to drive a secondary mechanism. Most pumps have internal gear or lobe type pumping mechanisms and are generally operated at relatively low operating speeds. The electric water pump can be driven by alternating current (AC) or direct current (DC) motors depending on the specifics of the application. In most cases, the pump and motor form an integral unit with no external shafts and a flange joint between the two. A wide range of pump sizes and capacities are available as standard units or standard spare parts for specific applications.
Hydraulic pumps draw fluid from a reservoir and deliver it under high pressure to a secondary mechanism as an actuation power source. The fluid is typically a specially formulated viscous oil used to operate positive displacement mechanisms such as hydraulic pistons and valve actuators. The fluid is pumped into a small enclosed space in the secondary device mechanism where it pushes against a rotating vane or piston. The high fluid pressure drives the vane or piston, providing a powerful driving force in the process.
Most hydraulic pumps are of the lobe or gear type driven at moderate operating speeds by electric motors. Some pumps can run other sources such as compressed air or even hydraulic power such as high-velocity streams of water. The electric water pump is, however, the most common and most efficient type. The motors used to drive the pumps can be designed for either AC or DC power supplies, with the AC variants most commonly seen in static, factory or industrial installations and the DC types most commonly used on vehicles and other mobile installations.
The electric water pump is generally of one-piece construction consisting of a pump mechanism and motor joined together with a flange-type mounting arrangement. This type of design provides the most compact unit and is also the simplest configuration to effectively seal against oil leaks and the ingress of dust and moisture. In some cases, the oil tank may be an integral part of the unit or a separate tank that feeds the pump via pipes or tubes. A large selection of electric water pump designs are available, with smaller units typically featuring motors of about 1 horsepower (0.75 kilowatts) and pump horsepowers of about 1 gallon (3.75 liters) per minute at a pressure of 100 bar ( 1,000 kilopascals). Large units may have 14.75 horsepower (11 kilowatts) motors and deliver oil at a rate of 13 gallons (50 liters) per minute at a pressure of 100 bars (1,000 kilopascals).
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