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What is the Hydraulic System?What is the Hydraulic Cylinder?
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What is the Hydraulic System?What is the Hydraulic Cylinder?

Views: 49     Author: Site Editor     Publish Time: 2018-05-31      Origin: www.fuchun-casting.com

What is the Hydraulic System?

A hydraulic system is a drive technology where a fluid is used to move the energy from e.g. an electric motor to an actuator, such as a hydraulic cylinder. The fluid is theoretically uncompressible and the fluid path can be flexible in the same way as an electric cable.


Hydraulic systems are mainly used where a high power density is needed or load requirements chance rapidly. This is especially the case in all kinds of mobile equipment such as excavators and in industrial systems such as presses.In wind turbines, hydraulics is used for pitch and brake control. In some cases, different auxiliary systems such as hatches and cranes are also powered by hydraulic systems.


The hydraulic system can be divided into five components: the power component (oil pump), the actuator (hydraulic cylinder or hydraulic motor), the control element (various valves), the auxiliary components and the working medium.


hydraulic system

What is the Hydraulic Cylinder?

Hydraulic cylinders are a vital component of hydraulic systems, and thus reliability of hydraulic cylinders is crucial to the operation of your hydraulic system.  


A basic hydraulic cylinder consists of a tube (sometimes referred to as a barrel), a rod, a piston, and a head. A high quality hydraulic cylinder can reduce down time, loss of costly hydraulic fluid, and increase safety.


One of the main benefits of the Hydraulic Cylinder is that incredible amounts of pressure can be released. This principle makes it possible for machines to accomplish seemingly herculean tasks with ease. Without modern hydraulics, vital actions such as the emergency braking of a lorry or boring into the side of a mountain would be all but impossible.


Applications of Hydraulic Cylinders

Hydraulic cylinders are the moving force behind many commercial and industrial manufacturing concerns.

These components can also be seen in other sectors such as:

  •       Aerospace industry

  • Particularly for such devices as landing gears and wing flaps

  • Aerial Work Platforms (AWP):

  • Agricultural: Small spraying equipment as well as harvesters, loaders and tractors

  • Automotive

  • Civil Engineering: Bulldozers, excavators, trenchers as well as attachments

  • Energy: Flow controls for water gates

  • Forestry and logging

  • Motorway repairs and maintenance

  • Materials handling: Single acting hydraulic cylinders for sale are commonly employed in such equipment

  • Mechanical engineering: Operation for feeding devices as well as automated production lines, plastic forming machines and transportation devices

  • Oil and gas industries

  • Recycling plants: Compressing scrap metal and other materials

  • Shipbuilding: Steering devices


These applications demonstrate the depth of industrial reliance on hydraulic cylinders. These efficient, effective and simple machines are capable of accomplishing much that we all take for granted in our lives.


The Key Details of Hydraulic Cylinder

The cylinder is often exposed on a hydraulic cylinder, and especially on construction equipment, will see a lot of abuse. Rocks and debris are beating on the rod day after day, and so the rod gets damaged. Little nicks, chips and dings start to appear, and soon, this results in the failure of the rod seal. As the rod passes across the rod seal, chips, nicks and dings wear and tear at the seal. The 3 points of Durability /Toughness/Longevity are very important for hydraulic cylinder.


At the same time, the maintenance of the hydraulic cylinder should be careful and careful.We can provide cylinder compoments that meet high precision engineering requirements.Besides, the special metal mixtures can ensure less wear and tear.


If you would like to learn more about the range of products that we offer, please do not hesitate to contact us at your convenience. We are happy to address any additional questions.

high quality hydraulic components



  • What is 'multiple certification'?

    This is where a batch of steel meets more than one specification or grade. It is a way of allowing melting shops to produce stainless steel more efficiently by restricting the number of different types of steel. The chemical composition and mechanical properties of the steel can meet more than one grade within the same standard or across a number of standards. This also allows stockholders to minimise stock levels.

    For example, it is common for 1.4401 and 1.4404 (316 and 316L) to be dual certified - that is the carbon content is less than 0.030%. Steel certified to both European and US standards is also common.

  • What surface finishes are available on stainless steels?

    There are many different types of surface finish on stainless steel. Some of these originate from the mill but many are applied later during processing, for example polished, brushed, blasted, etched and coloured finishes.

    The importance of surface finish in determining the corrosion resistance of the stainless steel surface cannot be overemphasised. A rough surface finish can effectively lower the corrosion resistance to that of a lower grade of stainless steel.

  • Can I use stainless steel at high temperatures?

    Various types of stainless steel are used across the whole temperature range from ambient to 1100 deg C. The choice of grade depends on several factors:

    1. Maximum temperature of operation
    2. Time at temperature, cyclic nature of process
    3. Type of atmosphere, oxidising , reducing, sulphidising, carburising.
    4. Strength requirement

    In the European standards, a distinction is made between stainless steels and heat-resisting steels. However, this distinction is often blurred and it is useful to consider them as one range of steels.

    Increasing amounts of Chromium and silicon impart greater oxidation resistance. Increasing amounts of Nickel impart greater carburisation resistance.

  • Can I use stainless steel at low temperatures?

    Austenitic stainless steels are extensively used for service down to as low as liquid helium temperature (-269 deg C). This is largely due to the lack of a clearly defined transition from ductile to brittle fracture in impact toughness testing.

    Toughness is measured by impacting a small sample with a swinging hammer. The distance which the hammer swings after impact is a measure of the toughness. The shorter the distance, the tougher the steel as the energy of the hammer is absorbed by the sample. Toughness is measured in Joules (J). Minimum values of toughness are specified for different applications. A value of 40 J is regarded as reasonable for most service conditions.

    Steels with ferritic or martensitic structures show a sudden change from ductile (safe) to brittle (unsafe) fracture over a small temperature difference. Even the best of these steels show this behaviour at temperatures higher than -100 deg C and in many cases only just below zero.

    In contrast austenitic steels only show a gradual fall in the impact toughness value and are still well above 100 J at -196 deg C.

    Another factor in affecting the choice of steel at low temperature is the ability to resist transformation from austenite to martensite. 

  • Is stainless steel non-magnetic?

    It is commonly stated that “stainless steel is non-magnetic”. This is not strictly true and the real situation is rather more complicated. The degree of magnetic response or magnetic permeability is derived from the microstructure of the steel. A totally non-magnetic material has a relative magnetic permeability of 1. Austenitic structures are totally non-magnetic and so a 100% austenitic stainless steel would have a permeability of 1. In practice this is not achieved. There is always a small amount of ferrite and/or martensite in the steel and so permeability values are always above 1. Typical values for standard austenitic stainless steels can be in the order of 1.05 – 1.1. 

    It is possible for the magnetic permeability of austenitic steels to be changed during processing. For example, cold work and welding are liable to increase the amount of martensite and ferrite respectively in the steel. A familiar example is in a stainless steel sink where the flat drainer has little magnetic response whereas the pressed bowl has a higher response due to the formation of martensite particularly in the corners.

    In practical terms, austenitic stainless steels are used for “non-magnetic” applications, for example magnetic resonance imaging (MRI). In these cases, it is often necessary to agree a maximum magnetic permeability between customer and supplier. It can be as low as 1.004.

    Martensitic, ferritic, duplex and precipitation hardening steels are magnetic.

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