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How to choose hydraulic hose?

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ꦆThe correct selection of hydraulic hose is related to the working performance of the entire hydraulic system, so we need to comprehensively consider many factors such as pressure, materials, and size.

1. Assembly code of hydraulic hose

Before formally understanding the design parameters of the hose, let's first understand why the hydraulic hose is always printed with a line of code, and what they represent.

🐼In fact, printed on the hose is the hose assembly number, which is the order number when we buy the hose from the manufacturer, and these codes also show us information related to the performance of the hose.

Now, let's see what we can learn from this list of code names.

ACME is the name of the manufacturer

Jupiter is the type of tube

170-04 is a hose model

1/4" refers to the diameter of the hose

♓5000psi refers to the maximum working pressure of the hose

🌜SAE100R2AT refers to the hose implementation standard, and there are three common hose implementation standards, namely SAE, DIN and ISO.

Of course, the information marked by different manufacturers will be different, but the basic information of the maximum working pressure and hose model will be reflected. Because only if you know the hose model, you can find other more detailed information from the manufacturer's sample.

ꦍFor example, based on the code name, we know that the hose is 170-04.

ওFrom the sample, we can find out that the outer diameter of the hose, the minimum burst pressure, the minimum bending radius, the weight and so on are not reflected in the code.

2. Maximum working pressure

🤪All hydraulic hoses included in the SAE standard have a maximum working pressure value and a minimum bursting pressure value. The minimum burst pressure is generally 4 times the maximum working pressure.

♚(Minimum burst pressure =4x maximum working pressure)

ꦰDue to the impact load of the hydraulic system at work, when selecting the hose assembly, it is necessary to ensure that the rated working pressure of the hose assembly is greater than or equal to the peak pressure of the hydraulic system.

♏(Rated working pressure of hose ≥ peak pressure of hydraulic system)

😼Of course, with the increase of pressure, the number of steel wire layers that the hose needs to use is more, and the price will naturally be higher.

ღThe development speed of hydraulic hose is very fast, the textbook tells us that the maximum pressure pressure of the hose is generally about 40MPa, but in the hydraulic testing industry, the pressure of more than 400MPa hose is also more common.

ꦜThe maximum working pressure of the hose is not difficult to find in the assembly code, because it is the only value with a pressure unit, for this hose, 5000psi is its maximum working pressure.

🦂If this hose is selected, the rated pressure of the hydraulic system can only be less than 5000/1.5, which is about 3333psi.

5000/1.5 material 3333 psi

🤡Note, do not choose the maximum working pressure below the rated pressure of the hydraulic system hose, which may have a fatal risk.

In addition, although the burst pressure of the hose is often four times the maximum working pressure. But that doesn't mean you can make the hose work anywhere near the burst pressure, you're risking your life.

🙈(Rated pressure: can be called continuous working pressure, that is, under the pressure of the hose can continue to work.

💞Maximum working pressure: can be referred to as the allowable pressure under short impact.)

3, hose material

🥃The choice of hose material is also related to many factors, such as chemical compatibility with the fluid medium, the temperature of the internal conveying medium, the external ambient temperature, and so on.

♉We know that hydraulic hoses are made up of multiple layers,

ඣThe innermost layer is called the inner rubber layer, which is directly in contact with the fluid medium, so the chemical compatibility between the inner rubber layer and the fluid medium should be considered;

🐼In the middle, we are called the reinforcement layer, that is, the braided insulation layer, which is composed of one or more layers of fiber or steel wire braided, and the hose mainly relies on the reinforcement layer to withstand pressure;

ꦓThe outermost layer is called the outer rubber layer, which protects the hose from external oil, chemical erosion, physical scratches and other factors.

ꦏIn some specific occasions, the hose may also be required to have high temperature resistance, low temperature resistance, flame retardant and so on.

4. Diameter of hose

ꩵIn order to minimize the pressure loss of the system and avoid excessive heating of the oil, the size choice of hoses and joints is also very important.

As shown in the figure

🐈I.D.(InnerDiameter) : indicates the inner diameter of the hose.

ꩲO.D.(OuterDiameter) : indicates the outer diameter of the hose.

So the question is, how do we get information about the inside diameter of the hose? Do you measure with a caliper? It's nice to think. You can't measure a hose with a clamp on both ends.

👍In fact, as already said, the hose assembly code will directly tell us what its inner diameter is. For example, the inside diameter of this hose is 1/4 inch.

🅺With the development of technology, manufacturers are gradually improving the packaging process of hoses. Compared with two hoses of the same inner diameter, the price of a small outer diameter will be higher, because it is lighter in weight and the minimum bending radius is smaller.

ꦐAbout the minimum bending radius, and how to choose the right path in the design, we will talk about it later.

5. Length of hose

ඣAfter the high-pressure oil is passed into the hydraulic hose, under the action of pressure, the length of the hose will change, and the change range can reach about -4%~+2%.

🌃Therefore, when considering the length of the hose, it is necessary to leave enough free length, that is, the sagging amount. In general, the droop quantity L≥1.5D (D is the outer diameter of the hydraulic hose).

Of course, the hose can not be too long, too long hose will increase the flow resistance, resulting in an increase in oil heat, reduce the efficiency of the system. And it's easy to trip over.

ඣOf course, if there is a relative displacement between the two connection points, then you do want to make sure that the hose is long enough to ensure the relative motion between the two objects.

✃Hose too short will not work, if the hose is too tight, the hose will be deformed when connected, this deformation will cause some parts of the inner diameter narrow, also will reduce the efficiency of the system.

🌊Another reason is that when the hose is pressurized, the hose that is too short may detangle from the joint impound.

𝔍The correct approach is to ensure that the hose begins to bend at a certain distance from the buckle joint, and this distance should be at least twice the outer diameter of the hose.


💧Choose the right hydraulic pipeline for the equipment, the following points can be used as a basis, hope to help you:

🧸1. Size of rubber hose. The inner diameter of the pipe affects whether the flow medium of the equipment can be unimpeded; When the hose is fixed with a hose clamp or the hose is passed through the steel plate, pay attention to the outer diameter of the hose.

🔯2, hose pressure. Select the matched pipeline pressure according to the working pressure of the equipment. Due to the impact load of the hydraulic system, the maximum working pressure of the hose is generally greater than the maximum working pressure of the hydraulic system, and the blasting pressure of the hose is generally 3ー4 times the maximum working pressure.

🌞3, the transmission medium and the use of the environment: to choose the corresponding hydraulic hose, such as: the transmission medium is hydraulic oil, then choose the hydraulic oil resistance; Select the hose according to the use environment, see whether the environment is harsh, whether it is open air, light time, whether it is frequent friction, external temperature, etc.

🐼4, minimum bending radius: Because the hydraulic hose should not exceed the minimum bending radius when in use, it is necessary to consider the specific location of the product using the hydraulic hose to determine the appropriate minimum bending radius


Contact Us

Contact: China Zhuofan Hydraulic Co., Ltd Phone: +8613184968882 Tel: +8613184968882 E-mail: zfhydraulic@163.com Add: Jing County, Hengshui City, Hebei Province, China
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