variable pressure hydraulic pump made in china

11VLO260 variable axial piston pump is open circuit with nominal pressure 5100 psi (350 bars).Maximum pressure for A11VLO260 variable axial piston pump is 5800 psi (400 bars). The A11VLO260 variable axial piston pump of swash plate design for hydrostatic drives in open circuit hydraulic system.A11VLO260 variable axial piston pump is designed primarily for use in mobile applications.The A11VLO260 variable axial piston pump can be operated under self-priming conditions with tank pressurization, or with an optional built-in charge pump (impeller).

Variable displacement axial piston pumps adjust the geometric output volume from maximum to zero. As a result they vary the flow rate that is provided to the consumers.

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– To ensure the functional reliability of the axial piston unit, a gravimetric analysis of the hydraulic fluid is necessary to determine the amount of solid contaminant and to determine the cleanliness level according to ISO 4406. A cleanliness level of at least 20/18/15 is to be maintained.

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Fortunately, thanks to modern hydraulic systems, you do not have to worry about accomplishing such tasks. However, several hundred years ago, things were very different before the invention of modern hydraulics.

The use of hydraulics can be traced back to the ancient civilisations of Greece, Persia, China, Rome, and Sri Lanka. These early civilisations were inspired by the Egyptians’ earlier uses of water power. Whilst most of their inventions used water hydraulics, they still helped fuel the advances in fluid power during the 1600s to late 1800s.1

One of the most influential people to help advance hydraulics was Blaise Pascal. He studied and developed several hydraulic fluid principles, which we know today as Pascal’s Law.2

Daniel Bernoulli and his study of fluid dynamics later used Pascal’s principles, resulting in the creation of Bernoulli’s Principle. While Bernoulli was the one who figured out that as flow speed increases, pressure decreases, it was Leonhard Euler who refined Bernoulli’s efforts and created Bernoulli’s equation in 1752, which we still use today.3

Bernoulli’s and Euler’s contributions further paved the way for another inventor, Joseph Bramah. Bramah invented the hydraulic press. It relied on Pascal’s Law that the pressure of a closed fluid system remains constant. It also applied Bernoulli’s Principle.

Hydraulic piston pumps are better suited to applications with greater operating pressure. Gear pumps are not always capable of producing the necessary operating pressure, so piston pumps must be used. Furthermore, piston pumps are used in systems requiring a variable flow rate and in systems with torque and power limitations.

In 1999, Matti Linjama from the Tampere University of Technology developed the concept of digital hydraulics. He theorised that computer-controlled digital valves could be used in place of current hydraulic valves to achieve the same desired output, reducing the number of valves required.7

The first working digital hydraulic systems started to be produced in 2009. These systems were built to address inefficiencies found in modern hydraulic manufacturing equipment.

It was not long before other industries took notice, including the automotive industry. Today, digital hydraulic systems are used for anti-lock brakes, electric motors, stability control systems, and various driver-assisted features like emergency braking and variable cruise control.

In 1994, Edinburgh Wave Power Group created Artemis Intelligent Power. Around the same time as Matti Linjama was developing digital hydraulics, Artemis Intelligent Power was working on the concept of Digital Displacement® Technology.

This technology theorised that it could be possible to enable and disable moving hydraulic cylinders in real-time using computer technologies, ultra-fast control valves, and hydraulic pumps.

There are “smart” hydraulic engines available that do exactly what Artemis initially believed possible. Their invention improves the efficiency of hydraulic engines and makes it possible to do things conventional hydraulic engines have not been able to do.8

Hydraulic pumps in modern times and the future look very favourable. In the not-so-distant future, traditional hydraulic pumps, including fixed displacement pumps, vane pumps, and variable displacement pumps, could become obsolete.

Part of the reason digital hydraulics are expected to continue to grow and expand are the numerous benefits gained by using digital pumps, valves, and systems, which include:

We can also help you custom design and build ahydraulic system solution to your specific needs and requirements. For further assistance in sourcing the right hydraulic pumps, valves, motors, and more, please feel free to contact us directly at +44 (0) 1475 742500 today.

Gear pumps are also widely used in chemical installations to pump high viscosity fluids. There are two main variations; external gear pumps which use two external spur gears, and internal gear pumps which use an external and an internal spur gears (internal spur gear teeth face inwards, see below). Gear pumps are positive displacement (or fixed displacement), meaning they pump a constant amount of fluid for each revolution. Some gear pumps are designed to function as either a motor or a pump.