High-Pressure Hydraulic Fittings and Oil Pipes - Quality Suppliers & Factory in China
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:
Product Description
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 main functions of hydraulic oil pipe joints?
Their main function is to connect pipelines, hoses, pumps, and valves within a hydraulic system. They ensure leak-free sealing under high pressure, adapt to high-pressure systems, and offer reliable, vibration-resistant connections.
What thread standards are available for these hydraulic fittings?
Common thread standards include Metric (M), Imperial (G, cylindrical pipe thread), American (UNFPA/UN), JIC, and tapered pipe threads (PT/NPT). Matching the correct thread is essential to prevent system oil leakage.
How do card sleeve joints ensure a reliable connection?
Card sleeve joints cut into the outer wall of the steel pipe to form a firm seal. They are highly resistant to high pressure and vibration, making them widely used in heavy construction machinery.
What are the typical applications for these hydraulic joints?
They are mainly used in hydraulic machinery like excavators, loaders, forklifts, injection molding machines, and presses to ensure stable oil flow and pressure transmission.
How do I select the right hydraulic joint for my system?
Selection is based on matching the interface thread standard, matching the pipeline inner diameter to avoid pressure loss, and choosing a pressure level (low, medium, high, or ultra-high) that matches the system working pressure.