A hydraulic hose should match the maximum pressure a hydraulic system is capable of providing. If you’re looking for a hydraulic hose with fittings, there is some useful information that you should know about hoses. Remember that there can be pressure-increasing components in systems that can go much higher than the hydraulic relief or pump pressure capacity. That’s especially when a pressure intensifying cylinder is flow generated.
Special attention has to be taken when designing systems equipped with geared flow dividers due to this effect.
Hydraulic Hose with Fittings
Hydraulic hoses often come with a burst rating of four times the pressure rating. Though you can use a lower-rated hose for a short time, it will fail shortly. It’s important to then look at the failed hose and ensure that it will match the hydraulic flow circuit pressure ratings. Sometimes, people make hydraulic hose assemblies from the wrong hose type and don’t realize it until they fail. That can happen even from the factory.
High-Pressure Hydraulic Hoses for Mobile Equipment
Various Pressure Ranges
These types of hydraulic lines often come in a small number of pressure ranges. However, there are exceptions to this, particularly with hose makers attempting to get into the market by providing different benefits to their target customers. 600PSI rated hose can be generally found on closed-loop hydro-static circuits like higher horsepower drives and track-ground drives utilized on trenching, drillers types of equipment, etc.
There’s also a 4000PSI hose utilized on some of the open-loop piston pumping machines involved in manufacturing. The 3000PSI hydraulic hose is the most commonly found. It usually comes with gear pumping circuits utilized in correlation with gear motor systems and high-pressure cylinders.
There are several hoses 1500 and below PIS ratings utilized in return lines and other special situations. The majority of these hydraulic hoses are used in supplying the valves and then returning to oil coolers, reservoirs, and hydraulic filters.
Steel Hoses/Lines
Steel lines are more advantageous than hydraulic rubber hoses. That’s because of the better heat rejection, greater abrasion resistance, and pressure fatigue resistance as well as greater fire resistance. If there’s a long-distance run to a machine, it’s good to install solid steel lines bent into shape to route the hydraulic oil circuit.
Hose Expansion
Usually, hoses expand with the pressure cycle. The hoses have a crimped steel end known as hydraulic fitting. Hose fatigue failure will generally happen near the hose end as the steel fitting hose and rubber fitting hose end will expand at different rates. The hydraulic hose end can also be susceptible to a wrong crimp process if the crimping technician isn’t trained. Steel hydraulic lines won’t be flexible as hydraulic hoses. You must, therefore, be careful not to preload any component that they are connected to when setting up the steel line to your system.
During the manufacturing process, a hydraulic hose is the last procedure done to a system. When engineers and technicians are hurried and subjected to work pressure to fulfill deadlines, it’s the hydraulics and hydraulic hoses that often suffer. With time, after complaints get back in from the consumers, they can route the hydraulic fittings and hoses to provide the best service of the components.
Conclusion
You should pay careful attention to how hoses will lay while in service. For instance, your machine should follow the minimum bending radius. Also, ensure that your hydraulic hose with fittings is not clamped into place to prevent the rubbing that happens when under pressure. During routing hydraulic hoses through a structure that pivots, you should ensure you can prevent these hoses from getting strained. Ensure that your hoses can clear obstructions and won’t be subjected to unnecessary rubbing.