Hydraulic Joint

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What is a Hydraulic Joint?

A hydraulic joint is a type of joint used in hydraulic systems to connect two components, such as hoses or pipes, in order to facilitate the transfer of fluids. These joints are designed to be both leak-free and flexible, allowing them to absorb shocks and vibrations without compromising the integrity of the system. Hydraulic joints are typically made of materials such as steel or nylon, and can be connected using various types of fittings, including threaded connections, flanges, and quick-connect couplings.

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Benefits of Hydraulic Joint

Durability

Hydraulic joints are made with high-quality materials that ensure their longevity and durability. They can withstand high levels of pressure, wear, and tear, making them suitable for heavy-duty applications.

Versatility

Hydraulic joints can be used in a wide range of applications, including machinery, construction equipment, and industrial systems, among others. This versatility makes them a popular component in various industries.

Efficient Transmission of Power

Hydraulic joints are designed to transfer power efficiently from one component to another. They can transmit high levels of power, which makes them ideal for heavy-duty applications that require a lot of energy.

Easy to Install

Hydraulic joints are relatively easy to install and maintain. They don't require complex assembly techniques or tools, which means they can be quickly and easily installed.

Smooth Operation

Hydraulic joints have a smooth operation and generate less noise, making them ideal for applications that require quiet operation.

Improved Safety

Hydraulic joints are designed with safety in mind. They have built-in safety features that prevent excessive pressure or overloading, which helps protect workers and equipment from damage or injury.

Types of Hydraulic Joint

01/

O-ring Face Seal Hose Couplings

When the nut of the internal thread is screwed with the external thread, as the tightening torque increases, the hose joint plane and the end surface of the external thread of the Oring contact and are compressed, the O-ring is elastically deformed, and the end surface of the internal and external threads is fully Contact and generate pressure, play a sealing role.

02/

24°cone Sealing End Hose Connector

When the nut of the internal thread is screwed with the external thread, with the increase of the tightening torque, the outer cone surface of the hose connector and the inner cone surface of the outer thread are in contact and compressed, and the O-ring on the outer cone surface of the hose connector Produce elastic deformation, fully contact with the cone surface of the external thread and generate greater pressure, which plays a sealing role. Due to the leverage of the cone surface, the pressure between the cone surfaces is greater, and the sealing effect is theoretically better.

03/

Flange End Hose Connector

The flange head of the hose joint is clamped on the oil port by the flange. When the bolt tightening torque increases, the bolt produces a large pre-tightening force. The bolt pre-tightening force is increased by the flange, and the flange head is pressed tightly on the The oil port and the O-ring on the flange head are deformed under pressure. The end face of the flange head of the hose connector and the oil port surface are fully contacted and the pressure generated plays a sealing role. Due to the use of high-strength bolts, the contact surface The pressure is very high, and the sealing effect is theoretically very good.

04/

37°flared End Hose Connector

When the nut of the internal thread is screwed with the external thread of the joint body, with the increase of the tightening torque, the cone surface of the internal thread joint of the hose and the cone surface of the external thread are in contact and compressed, and the cone surface of the hose connection is fully contacted and compressed. Generates a greater pressure and plays a role of sealing. Due to the leverage of the cone surface, the pressure between the cone surfaces is greater.

05/

Elbow Joint

Elbow joints are used to change the direction of fluid flow in hydraulic systems. They are available in different angles to suit different applications.

06/

Union Joint

Union joints are used to connect two pipes or tubes together using a threaded connector. They are commonly used in low-pressure hydraulic systems.

Application of Hydraulic Joint

Automotive Industry

Hydraulic joints are commonly used in the automotive industry to connect various parts of the vehicle's hydraulic system, such as brakes, steering, and suspension.

Agricultural Industry

Hydraulic joints are used in agricultural equipment, including tractors, cultivators, and harvesters, for controlling various hydraulic mechanisms.

Manufacturing Industry

Hydraulic joints are extensively used in the manufacturing industry for connecting various machinery and equipment. The joints facilitate smooth operation and improve the efficiency of the manufacturing process.

Construction Industry

Hydraulic joints are used in heavy construction equipment, such as cranes, bulldozers, and excavators, for controlling various hydraulic functions.

Aerospace Industry

Hydraulic joints are used in the aerospace industry for connecting hydraulic lines and controlling various hydraulic mechanisms in aircraft and spacecraft.

Marine Industry

Hydraulic joints are used in marine equipment, such as boats, ships, and submarines, for controlling various hydraulic systems, including steering, propulsion, and hatch and door operations.

Material of Hydraulic Joint

Steel Hydraulic Fittings

Steel is the most common hydraulic hose fitting material. It offers excellent strength and durability. Steel can withstand temperatures ranging from -65 degrees Fahrenheit to 500 degrees Fahrenheit.

Stainless Steel Hydraulic Fittings

Steel comes in various grades, mixing iron, carbon, and other metals (such as Chromium) to create tougher, more durable, or more corrosive-resistant metals. These fittings are used when the temperature rating requires ranges from -425 degrees to 1,200 degrees Fahrenheit.

Plastic Hydraulic Fittings

Fittings made of plastic are very corrosion-resistant but weaker and less durable than other materials. They are affordable but do not hold up to high-pressure ratings or high temperatures. Because of their low durability, metal fittings are preferred.

Brass Hydraulic Fittings

Brass fittings can handle temperature ranges from -65 degrees to 400 degrees Fahrenheit. Brass offers excellent corrosion resistance and can handle up to 3,000 PSI, but lower pressure ranges are usually recommended.

Aluminum Hydraulic Fittings

Aluminum fittings are lightweight and very resistant to corrosion. Aluminum fittings are less prevalent and durable than steel, but the automotive industry has embraced them due to offering an excellent strength-to-weight ratio.

Process of Hydraulic Joint

Identify The Components

The first step is to identify the two components that you want to connect with a hydraulic joint. These components could be cylinders, pumps, valves, or other components.

Clean the components

Before creating the joint, it is essential to clean the components to remove any dirt, dust, or other contaminants. This ensures that the joint will form a tight seal and prevent leaks.

Choose the type of joint

There are several types of hydraulic joints such as flange, threaded, welded, and quick-connect. The type of joint will depend on the components being connected and the pressure and flow requirements.

Select the seal

The seal is an essential part of the hydraulic joint and is critical for preventing leaks. The type of seal will depend on the type of joint, the pressure, and the temperature requirements.

Lubricate the seal

Before assembling the joint, it is essential to lubricate the seal to ensure it functions correctly.

Assemble the joint

Once the seal is lubricated, the joint can be assembled by connecting the two components and tightening the bolts, nuts, or couplings.

Test the joint

Before putting the hydraulic system into operation, it is essential to test the joint for leakage and make any necessary adjustments. This ensures that the joint is working correctly and prevent any damage to the hydraulic system.

How to Maintain Hydraulic Joint

Regularly Clean The Joint Area

Any hydraulic joint should be kept clean and free from any dirt or debris as these can damage the seals and cause the joint to fail over time. A simple wipe with a clean cloth is often enough.

Check For Leaks

Any leaks in the hydraulic joint should be addressed immediately. If left unchecked, this can lead to a more severe problem down the line. Check the joint regularly for any signs of leakage and address any concerns immediately.

Replace Worn-out Seals

The seals of a hydraulic joint can wear out over time due to the pressure and movement of the joint. It is important to replace any worn-out seals as soon as possible to prevent leaks and damage to the joint.

Use The Right Fluids And Oils

Ensure that the hydraulic joint is lubricated with the correct fluid or oil. This is important because the wrong type of fluid can cause damage to the joint and lead to eventual failure.

Avoid Applying Excessive Pressure

To maintain a hydraulic joint, it is important to avoid applying too much pressure when using the system. Excessive pressure can put undue strain on the joint and cause it to fail prematurely.

Regular Inspection

Regular inspection of the hydraulic joint is important to spot any signs of wear and tear early on. This enables prompt maintenance before any severe damage occurs.

Our Factory

China Saiya Hydraulic Equipment Co., Ltd. is an enterprise integrating R&D, production and sales. It has a complete and effective quality management and quality assurance system. The company has sophisticated special equipment and professional technicians.

Frequently Asked Questions Hydraulic Joint

Q: What is the most common hydraulic fitting?

A: The three most common fitting ends and connector types for hydraulic fittings are the O-ring, the mated angle, and the tapered thread connectors. Although these are the most popular choices, several other types are used in different and specialised applications.

Q: How does a hydraulic joint work?

A: Hydraulic joints are engineered pressure transfer rings that safely transfer jacking forces from pipe to pipe. These rings have predictable mechanical behavior and permit a proper understanding of stresses acting on the pipe.

Q: How does a hydraulic swivel joint work?

A: At the core of any hydraulic swivel joint, there exist two components, namely the input component and the output component. The function of the input is to uphold the reception of fluid, while the output component models this received fluid to a pathway creating rotation.

Q: Why do hydraulic fittings leak?

A: The threads are deformed when tightened and, as a result, any subsequent loosening or tightening of the connection increases the potential for leaks. Connectors which incorporate an elastomeric seal such as UN-O-ring, BSPP, ORFS and SAE four-bolt flange offer far superior seal reliability.

Q: How tight should hydraulic fittings be?

A: Once aligned, tighten the nut until it is "firm" against the washer and o-ring, with the nut becoming snug with a feel of metal-on-metal in less than one revolution. Over-tightening causes as many leaks as under-tightening.

Q: What are the parts of a hydraulic fitting?

A: What are the components of a hydraulic hose assembly ...

Fittings consist of the same two components. The hydraulic hose socket, along with the stem, mate the hoses. The socket goes over the hose cove while the stem fits into the tube's inner tube. The stem extends out from the hose and acts as a connector for equipment to attach to.

Q: What are the different types of swivel joints?

A: Some swivel joints use ball bearing raceways for better load distribution and spring-loaded seals to reduce torque drag. There are three basic types of swivel joints: straight-through, right-angle, and offset.

Q: Are hydraulic fittings metric or standard?

A: Hydraulic fittings with metric threads are the most common connectors worldwide. The three primary styles used in different regions and by specific OEMs are: DIN Metric fitting standards cover hydraulic hose fittings and compression fittings.

Q: What should hydraulic fittings be inspected for?

A: Inspect each visually from fitting to fitting with a focus on three main indicators:

Cracks or fissures.

Peeling, worn, or otherwise damaged outer covering.

Fluid seepage on or around the hose.

Q: Where do Hydraulic Lines Leak and Why?

A: If there is a leak in your hydraulic line, chances are it’s the fitting and not the hose that’s leaking. Using the wrong type of hydraulic fitting, improper sealing, or incorrect installation are the primary causes of leaks. Leaks will occur if over or under-torquing the connection, if an O-ring is missing or damaged, if the hydraulic fitting seal is not aligned correctly and even worse — if the threads are damaged.

Some fitting types leak more than others, particularly if they’ve been disassembled and reassembled. A good example is retightening a JIC fitting where the threads can be stripped and cause leaks.

Q: Primary Types of Hydraulic Fitting Styles!

A: There are only two types of hydraulic fittings, all-metal and O-ring:

All-metal fittings, such as a JIC 37-degree flare which has parallel threads where the seal is made by metal-to-metal contact between the male flared end and the female coned seat. There are many other types of all-metal fittings, including flareless and compression fittings.

An O-ring hydraulic fitting, such as an O-ring boss or O-ring face seal, compresses the O-ring between the two mating halves. Typical O-ring materials are NBR, Nitrile and Buna-N.

O-rings are used throughout fluid power connections to prevent leaks in fittings, pumps, valves and cylinders. They are used in both hydraulic and pneumatic connections, for dynamic and static systems.

O-ring fittings tend to be less prone to leaks and can be reassembled without the potential of leaking. It’s best practice to replace the O-ring and lightly coat it with a compatible lubricant prior to reassembly.

However, with metal-to-metal flared fittings it’s best to replace the male fitting if you need to disassemble them.

Q: How to Seal Hydraulic Fittings？

A: The best methods in how to properly seal hydraulic fittings are:

On NPT, JIC and other all-metal fittings: Loctite 5452 thread sealant helps prevent rotation and leakage on these high-pressure fittings. It seals hydraulic fittings at the mating surfaces by filling surface imperfections and scratches, withstanding pressures to 10,000 psi (690 bar) and enduring operating temperatures of -65°F (-54°C) to 300°F (149°C).

Teflon tape can be used in certain conditions for sealing hydraulic fittings styles, primarily on NPT threads where sealing tapes create a leak-free seal.

However, if not wound properly (clockwise), the tape can introduce contamination into the system. Teflon tape should not be used to seal certain hydraulic fittings, including:NPTF (National Pipe Thread Fuel) which forms a secure mechanical seal by essentially crushing the entire thread form-- another good reason not to disconnect and reconnect this type of fitting. Instead, replace it during maintenance.

Q: What is hydraulic joint?

A: What Does Hydraulic Joints Mean? Hydraulic joints are engineered pressure transfer rings that safely transfer jacking forces from pipe to pipe. These rings have predictable mechanical behavior and permit a proper understanding of stresses acting on the pipe.

Q: Purpose of hydraulic joint

A: Hydraulic pipe joints are used in hydraulic systems, and their role is to connect the parts between high-pressure oil pipes and high-pressure oil pipes. Various types of joints required for the connection of hydraulic or pneumatic management of various fluid power components are hydraulic joints. The purpose of use is mainly to connect the pipe to the hydraulic system. There is a seal on the bear interface to prevent leakage. effect.

Q: Structure of hydraulic joint

A: The connector is used to connect the components of the fluid power system. From the structural point of view, in addition to plugs and caps are necessary, in addition, there are at least two ports. The joint swaging connected to the system component part is the port end, and the end connected to the rigid pipe joint of the hose is the pipe end.

Q: What Are Hydraulic Fittings?

A: Hydraulic fittings are parts used to connect hydraulic hoses to other components. Hydraulic couplings are used in a variety of machines and equipment across all major industries. They are used in manufacturing hydraulics and assembly lines, water and sewage systems, oil refineries, and construction site hydraulics, to name a few.

There are different types of hydraulic fittings; each one serves a different purpose. They also come in different sizes, materials, types of seals, and temperature and pressure tolerances. For instance, a hydraulic fitting can either allow or prevent the flow of fluid. In some cases, the fittings are dual-use and can do both. But the most important quality of a hydraulic fitting is how effective it is in creating a tight seal.

The two main types of hydraulic fittings are crimped fittings and field attachable fittings. As the name implies, field attachable fittings or reusable fittings consist of a socket and a nipple and can be installed anywhere without using a crimper.

A crimped fitting is a permanent fitting that is sealed with acrimping machine. Crimped fittings are much more secure than a field attachable fitting but do need the equipment to make the seal. While many crimping machines are larger units that stay in the workshop, there are also many portable and handheld hydraulic crimpers to bridge the gap between crimp couplings and field attachable fittings..

Q: What Does JIC Mean In Hydraulic Fittings?

A:JIC stands for Joint Industry Council, defined by SAE J514 — compression fittings that have a 37-degree flare seating surface and parallel threads. These fittings are usually manufactured using nickel alloys, brass, carbon, and stainless steel.

JIC hydraulic fittings and connections are usually used in fluid power systems. Both the male and female fittings have 37-degree seats, whose seals are made by creating a contact between the flare of the male component and the coned seat of the female component. Connections of this type are considered mechanical.

Advantages of JIC Hydraulic Fittings include:

Have a wide range of fittings to cater to all industries

Are created with SAE regulations and fittings in mind, making them highly compatible and versatile

Work perfectly in high-temperature applications

Are highly durable. They can be disconnected and reconnected constantly without damaging the fitting.

Q: How To Seal Hydraulic Fittings

A: Hydraulic fittings are sealed either through O-rings, thread sealants, or self-sealing like SAE flanged fittings. They do not need to be manually sealed.

Q: How To Install Hydraulic Hose Fittings

A: Proper hydraulic hose fittings require selecting the right fitting, knowing the insertion depth, and using a hydraulic crimper.

Ensure that you have the right type and size of length for the hydraulic hose required for the application. You can opt to use hose cutters to cut it to the correct length with clean ends. This will reduce the risk of assembly failures or contamination.

Identify the correct hydraulic hose fitting by considering the size, temperature, pressure, style, material, and orientation. The type of hydraulic fluid used in operation should also be accounted for.

Determine the fitting’s depth of insertion, and place a mark on the hydraulic hose. If necessary, apply lubricant and insert the hose into the fitting using the mark as a guide.

Using a crimper, adjust to the fitting’s diameter – refer to the relevant crimp chart for specific instructions. The end of the hose should be placed within the crimping machine for crimping.

After verifying that the crimper is set to the suitable diameter, clean the hose assembly. This will prevent any contamination.

Q: How Do You Choose the End Fittings For a Hydraulic Hose?

A: The criteria for choosing the right end fittings for hydraulic hoses are size, material, temperature, pressure, application, and assembly. The proper assessment of these criteria is critical to ensure the safety and reliability of the connections. Each of the factors mentioned above are detailed below:

●Size – when it comes to the size, the important measurements to consider are the internal and external diameters of the hydraulic fittings. The diameters have to be compatible with that of the hydraulic hose. Fittings over or under-sized won’t be sealed properly and cause the connection to fail or leak.

●Material – different materials have different properties, which affect and determine the compatibility with the fluid. As such, making sure that the fitting is compatible with both the hydraulic fluid and the working environment is critical. Determine both and choose between brass, aluminium, steel, or stainless steel. The most widely-used sealing materials are O-rings made from NBR (Nitrile).

●Temperature – aside from ensuring that the different materials that make up hydraulic fittings are resistant to the operating temperatures, the type of fittings should also be considered.

●Pressure – the amount of pressure the hydraulic fitting is subjected to differ across varying industries and applications. Make sure that the fittings are rated for the pressure range required. Operating beyond the rated pressure may cause leaks and even danger to people in the working environment.

●Application – depending on the industry or application, the fittings could be used for either mixing or distributing. As such, hydraulic fittings such as the T-shape and the cross-shape come into consideration.

●Assembly – hydraulic systems that require frequent connections and disconnections of the hose or tube should consider quick-connect fittings. For instance, hydraulic compression fittings can also remove the need to weld or solder the fitting. It uses a compression nut that tightens against the ferrule, creating a tight seal.

●Permanence – Needing a permanent fitting or one that can be removed and changed frequently will affect the fitting style you choose. If this fitting is going to be changed often, a field attachable fitting will work just fine, but if you need something permanent and strong, using a crimping machine to crimp your fitting permanently is the perfect option.

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