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High-Pressure Hydraulic Fittings, Oil Pipes Supplier & Factory in China for Construction and Agricultural Machinery

Hydraulic oil pipe joints are essential components designed for efficient pipeline connection, sealing, and reversing in hydraulic systems. As a trusted supplier from China, our factory specializes in producing these high-performance joints, which are widely utilized in demanding high-pressure applications found in construction machinery, machine tools, agricultural equipment, ships, and hydraulic stations, Manufactured from high-quality 45-grade steel or 42CrMo alloy steel, our hydraulic oil pipe joints undergo rigorous quenching and tempering processes to ensure superior strength and toughness. This makes them capable of withstanding high pressure, pulse impacts, and prolonged vibrations without experiencing cracking or deformation. Furthermore, we enhance the durability of our products through surface treatments such as galvanizing, cadmium plating, or blackening, effectively protecting against rust and corrosion. This makes our hydraulic oil pipe joints ideal for harsh operating environments, including outdoor settings with oil pollution and high humidity. Choose us as your reliable China supplier and factory for top-notch hydraulic oil pipe joints

Product Details

Product Description

Hydraulic oil pipe joints are key components in hydraulic systems that connect pipelines, hoses, hydraulic pumps, valves, and other components. Their main function is to ensure sealing, withstand high pressure, and achieve reliable connections. According to the connection method and structure, the common types are as follows:

Structurally, it is mainly divided into various forms such as straight through, elbow, tee, variable diameter, hinge, flange, etc. The thread specifications cover metric M, imperial G, American NPT, JIC and other standards. It is matched with O-ring, combination gasket or metal hard seal to achieve high-pressure sealing without oil leakage, firm installation and strong sealing performance.

The advantage lies in excellent pressure resistance, adaptability to high-pressure oil system, reliable connection, earthquake resistance and anti loosening; Complete specifications, strong universality, can quickly connect hydraulic oil pipes of different diameters and threads; Easy disassembly and assembly, convenient for equipment maintenance and pipeline layout.

Mainly used in hydraulic equipment such as excavators, loaders, forklifts, injection molding machines, and presses, responsible for conveying hydraulic oil, ensuring smooth oil flow and stable pressure, it is an indispensable basic component in hydraulic systems.

Common Types

Expansion Joint

Sealing is achieved by expanding the end of the pipe into a trumpet shape, suitable for medium and low pressure (copper or thin-walled steel pipes).

Card Sleeve Joint

Using a card sleeve to cut into the pipe wall to form a seal, it is resistant to high pressure and earthquake, and is widely used in construction machinery (steel pipes).

Welded Joint

The pipe is welded to the joint body, with high strength and reliable sealing, suitable for high temperature, high pressure or high vibration environments.

Hose Connector

Used to connect hydraulic hoses, commonly of the crimping or reusable type, integrated with the hose.

Quick Connector

Can be manually and quickly disassembled, used in situations where frequent connection/disconnection is required (such as portable hydraulic tools).

Key Parameters and Selection

Thread Standard

It is necessary to match the interface thread, commonly including metric (M), imperial (G, cylindrical pipe thread), American (UNFPA/UN), and tapered pipe thread (PT/NPT). Choosing the wrong option may result in oil leakage or damage to the interface.

Pressure Level

Select according to the system working pressure (low pressure, medium pressure ≤ 16MPa, high pressure ≤ 35MPa, ultra-high pressure higher).

Diameter (inner diameter)

It needs to match the inner diameter of the pipeline to ensure flow and avoid pressure loss.

Frequently Asked Questions

What are the primary functions of hydraulic oil pipe joints?

Their main functions are to connect pipelines, hoses, pumps, and valves within a hydraulic system, ensuring a reliable, leak-free seal capable of withstanding high pressure and vibration.

Which thread standards are supported by these hydraulic fittings?

The thread specifications cover a wide range of standards, including metric (M), imperial (G, cylindrical pipe thread), American (UNF/UN/NPT), and JIC standards to ensure global compatibility.

Why is choosing the correct thread standard critical?

Choosing the incorrect thread standard can lead to serious connection issues, including high-pressure oil leakage or permanent damage to the interface threads.

What are the benefits of using card sleeve joints?

Card sleeve joints cut directly into the pipe wall to form a highly secure seal. They offer excellent resistance to high pressure and vibrations, making them ideal for heavy construction machinery.

In what types of machinery are these hydraulic joints commonly used?

They are widely used in industrial and construction hydraulic equipment, including excavators, loaders, forklifts, injection molding machines, and hydraulic presses.

How do I select the right pressure level for a hydraulic joint?

You should select the joint based on the maximum working pressure of your system: low pressure, medium pressure (≤ 16MPa), high pressure (≤ 35MPa), or ultra-high pressure configurations.