Hose assembly - how the selection

Hose assembly usage affect many factors , only in accordance with the conditions and the correct selection of hose fittings, hose used in order to ensure the reliability and economy. These factors are:
1 , hose size
Hose diameter should be appropriate, too small diameter pipeline will increase the flow rate of the medium , the system heat, reduce efficiency , and will produce excessive pressure drop , affecting the overall system performance , if the hose with hose clamps fixed or wear over steel and other spacers , they should also pay attention to the outside diameter of the hose .
2 , the working pressure
Generally refers to dynamic pressure hose hose in continuous maximum allowable working pressure . In accordance with the provisions of the relevant international standards for hydraulic hose safety factor is generally recommended working pressure of the hose is usually a quarter of the minimum burst pressure values ​​.
3, the impact stress and fatigue life
The selection is based on the hydraulic hose system design maximum pressure value determined . As the hydraulic system pressure value is usually dynamic and sometimes impact pressure , impact pressure peak is much higher than the maximum system pressure. However, the system generally have a relief valve, the impact pressure of the hose will not seriously affect the fatigue life. For particularly frequent shock pressure of the manifold block , suggested the use of particularly resistant to impact pulsation hose products.
4 , the temperature range
Users should be allowed in the hose quality specifications used within a temperature range of hose . If the working environment temperature exceeds this range , it will affect the life of the hose , which will greatly reduce the ability to withstand pressure . Operating ambient temperature is too high or too low, long-term system , we recommend using the hose jacket.
5, the chemical compatibility
If you use special hydraulic medium , users should ensure that their choice of hose assembly hose inner and outer , joints and O-ring compatible with the media.
6 , the bending radius
Bending radius
Meaning :, R is the hose can be bent without damage or shorten the life of the inner circle of the ( minimum ) radius .
For a hose , R value is banjo fitting certain. If the bend radius is less than when using the R value with the textile reinforcing layer is likely to occur hose kinks. Use a spiral wire hose would be better.
7 , the friction
Hose when used usual contact or friction with hard objects , the proposed increase in the external hose spring jacket.