Views: 0 Author: titanfittings Publish Time: 2023-09-14 Origin: titanfittings
Hydraulic systems are crucial to driving many industrial machinery and processes, requiring hydraulic oil to be forced at high pressure through a network of valves, pumps, and cylinders. Hydraulic hoses are the most essential components of these systems and connect all of these components together for smooth operation. Given the high pressures a hydraulic hose needs to withstand and the often tight space restriction requirements, the application certainly requires the current hose to be specified.
Typically, hydraulic hoses comprise of three parts.
An inner tube that carries the hydraulic oil, a middle layer(s) that reinforces the inner tube to withstand pressure, and an outer layer that guards the whole construction. The construction may change depending on the application, so look out for these hose types if you’re wondering which hydraulic hose type to choose for your application.
In addition to these, it highlights the build of the cover material, telling you how resistant it is to the external environment. That being said, here are common hydraulic hoses based on the SAE standard.
The SAE 100R4 and 100R6 are commonly used for low-pressure applications like return lines, anti-static lines, and vacuum applications. It is for this reason that they are low-pressure hoses with a layer or layers of braided textile fibers. Depending on the pressure, it may require a spiral of steel wire as well. Typically, they are suitable for petroleum and water-based hydraulic fluids and are small enough to be routed easily.
They are commonly used in applications that require medium pressure hydraulic oil like construction equipment, machine tooling, and hydraulic lifts. They even come in non-conductive variants for use in applications requiring electrical isolation.
Spiral steel wire hydraulic hoses are used for applications that require higher than normal pressures and superior resistance to flexing like heavy-duty machinery used in agriculture, logging, or mining. What makes R13 so suitable for high-pressure applications is the high number (minimum 4) of reinforcement braids used in its construction. Additionally, they are separated by a ply layer running in opposite directions to ensure adhesion between each layer, including the inner tube and the cover.
These are just some of the SAE standard hoses mentioned. Even within the above-mentioned standards, there are multiple subcategories. It all depends on your requirements that determine which hydraulic hose type to choose.
Choosing the correct hose application won’t be complete without a mention of the popular mnemonic used in the industry – S.T.A.M.P. It conveniently summarizes the factors to look out for when choosing hydraulic hoses for your application.
Low flow in hydraulic fluid dampens the response time of a hydraulic system, whereas a high flowing fluid may damage hydraulic lines.
Temperature
External working temperature, as well as fluid temperature, need to be considered when selecting a hose. Not all hoses use the same materials for the inner lining and the outer cover. Hence, they have different temperature ratings depending on the rubber or polymer used in their construction. Make sure you select those hydraulic hoses that can withstand the ambient temperature as well as the inner working temperature of the fluid with an additional margin of error for the upper limit. Otherwise, the hydraulic system may get clogged with debris from the inner lining, hoses may burst, and leaks may become more common.
Application refers to all the considerations you need to keep in mind before selecting a hydraulic hose assembly. It’s best to create a checklist to keep track of the different external influences on the hose, like the machinery it is intended to be a part of, what elements it’ll be exposed to, if it has to pass through constrictions, etc.
Media or medium is the official term used to describe the fluid being carried in a hydraulic system. Since a system has multiple hydraulic hoses conveying fluid to different parts, it’s essential that all of them are compatible with the fluid carried. Otherwise, the inner tubing may react with the medium, causing it to erode and clog up the system. Additionally, the outer cover must also be resistant to the element it is subjected to.
Hydraulic systems rely on the changes in pressure and velocity to carry out their function. The magnitude of this pressure varies throughout different components of the hydraulic system, each experiencing surges and drops while the system operates. In order to maintain the pressure and withstand spikes due to loading, the hydraulic hoses you select must have a working pressure rating (in PSI) that conveys fluid without bursting and remains intact after transient changes.
