Hydraulic hose fittings are used to connect hydraulic hoses, pipes, and tubes to cylinders, valves, and pumps, along with other components of a hydraulic system. The question many people have is what will happen if the wrong fittings or couplings are used? Unfortunately, a fitting that is too small can quickly reduce the efficiency of a hydraulic system and create a serious safety concern.
If someone is too overwhelmed by the hose coupling and fitting options or are unsure of what they need for hose repair, keep reading. Some tips to find the right fittings for the job can be found here.
Getting to Know the Hydraulic Hose Assembly
When it is time to choose a hydraulic hose fitting, there is no question it can be a little confusing. Crimping is one of the most common methods that is used when assembling any hydraulic system. It is a good idea to consider a few questions about the pressure, size, temperature, materials/media, and application before choosing a specific hose assembly.
After the specifications are known, the hose assembly technician can begin the work. The process will vary based on the crimper model that is being used, but usually, the technician will mark the depth of insertion of the hose, apply the proper lubricant to the selecting fitting stem, and then push it into the end of the hose. After that, the component is put into the crimper die. The last step is to secure the fitting permanently to the hose by activating the power unit of the crimper to apply additional pressure. A hose assembly technician can provide assistance in finding the right fitting and answer any questions a person may have.
Types of Materials Used for Modern Fittings
Hoses and fittings are available in many materials and types. The most common fitting options available today are made of brass, stainless steel, steel, or plastic.
The plastic fittings are considered to be the most resistant to corrosion. While this is true, they are not as durable and can be weaker. As a result, they are not the most popular option when it comes to a hydraulic setup, even though they are more affordable. Because of the high-pressure ratings, the better option is usually metal fittings.
Steel fittings are available, too. These come mixed with iron and other metals, which makes them more durable while improving heat resistance. For example, carbon steel fittings that are made of carbon and iron are able to withstand more extreme temperatures.
Another option is stainless steel fittings, which are used when higher or lower temperature settings are expected. These are smart options for environments that are highly corrosive. Usually, this material is rated to 10,000 psi, as well. It is possible to find some stainless-steel fittings that include special designs that will be rated up to 20,000 psi. However, the higher price makes them more expensive. As a result, alternatives are usually chosen.
The option that is less durable and strong than stainless steel is brass. These fittings offer a leak-free seal and meet the standards set by JIS, DOT, DIN, ISO, and SAE. Along with being able to withstand extreme temperatures, brass fittings can also accommodate pressure that reaches as high as 3,000 psi. While this is true, using lower pressure ratings is usually recommended. There are other materials that may be used too, but that is less common. For example, aluminum fittings are much lighter than steel and they are corrosion resistant.
Hydraulic Hose Fitting Types
There are several types of hydraulic hose fitting options. One is the permanent crimp fittings. These are the most common. They require the use of a crimping machine to attach the hose to the fitting. Another option is a field attachable. These are a great choice for those who do not have access to a crimper. However, this can only be used if the hose is considered “field attachable fitting” compatible.
Sealing Type
When selecting hydraulic fittings, there are more than a few things to consider. One of the first things is the security of the connection, which includes the sealing type. It is important to use caution if the National Pipe Taper or NPT is used. While it sounds easy to fix a leak with this fitting by tightening up the connection, there is also an increased risk of a crack developing in the fitting.
In most cases, this will happen if there are countless remakes. One way to help prevent the risk of leaks is by using O-rings that feature elastomeric seals. If these seals are used, it is essential to keep the temperature conditions within the range that is recommended. Just a single over-temperature event may cause serious damage to the seals and result in several leaks.
Pressure Rating
When equipment is modernized, it will usually require higher operating pressure. To help address this increased pressure, O-ring seals are being used. These are much more resistant to any cracking. Also, modern O-ring seals will help to prevent the risk of leakage and over-torquing. When it comes to materials, the stainless-steel hose fittings will provide the highest-pressure rating of all the options.
Vibration Considerations
When machines vibrate, this is going to affect hydraulic plumbing and it may shift the torque, resulting in fatigue. Remember to make sure to inspect areas that have higher vibration for any signs of damage or leaks.
Temperature
For tube fittings, the temperature range is determined by three factors, which include the seal (if used), plating, and material. To ensure leak-free operation, make sure to use O-ring seals – if it is possible based on the operating temperature.
If someone needs their hydraulic hoses and fittings to work under specific, extreme temperature conditions, there are options available. It is best to work out with the professionals to find out for sure what options to choose. Keeping the tips and information here in mind is the best way to ensure that the desired fittings are purchased.
