Hydraulic joints are connecting components between hydraulic pipes and hydraulic pipes, or between pipes and hydraulic components. Hydraulic joints include hydraulic joints for hoses and hydraulic joints for hard pipes. Only hydraulic joints for hoses and hydraulic hoses are introduced here. One end of the pipe joint is connected to the hydraulic hose (called the tail end), and the other end is connected to other components (terminals). In order to ensure compatibility and leak-free sealing with other components, the terminal of the hydraulic hose joint needs to be designed in accordance with the general interface standard.The main function of the tail end is to ensure the long-term sealing of the joint and the hose connection.
Main Types
The form of the slave interface can be divided into the following types:
1. O-ring end face sealing hose connector
- Hose connector
- Oil port
- O-ring
- Connector
- Nut
- O-ring
When the nut 5 is screwed with the external thread of the joint body, as the tightening torque increases, the hose joint and the end face of the joint body (piece 4) are in contact and compressed, and the O-ring on the end face of the joint 4 is elastically deformed , It is in full contact with the end faces of the parts 6 and 4 and generates pressure to play a sealing role.
Special attention is required during installation, and the sealing ring shall be checked before installation.
2. 24° cone sealing end hose connector
- Hose connector
- O-ring
- Oil port
- Connector
- Nut
When the nut 5 is screwed with the external thread of the joint body (piece 4), with the increase of the tightening torque, the outer cone of the hose joint and the inner cone of the joint body (piece 4) are in contact and compressed, and the hose The O-ring on the outer conical surface of the joint 1 is elastically deformed, and fully contacts the conical surfaces of the parts 6 and 4 and generates a greater pressure, which plays a sealing role. Due to the leverage of the conical surfaces, the pressure between the conical surfaces is greater. The sealing effect is theoretically better.
3. Flange end hose connector
- Hose connector
- Oil port, flange head, flange pressure plate
- O-ring
The flange head of the hose joint is pressed against the oil port by the flange pressing plate. When the bolt tightening torque increases, the bolts produce a large pre-tightening force. The bolt pre-tightening force passes through the flange pressing plate to tightly press the flange head on The oil port, the O-ring (piece 3) on the flange head is deformed under pressure, and the end face of the flange head of the hose connector (piece 1) is in full contact with the oil port surface and generates pressure, which plays a sealing role. Using high-strength bolts, the pressure between the contact surfaces is very large, and the sealing effect is theoretically very good.
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Special attention must be paid during installation. Check the O-ring on the end face before installation.
4. Stud end hose connector
The threaded root of the joint is equipped with an O-ring. When the joint is connected with the port through the thread, the O-ring is attached to the end face of the oil port to seal.
5. 37° Flared end hose connector
- Hose connector
- Nut
- Steel Pipe
- casing
When the nut 2 is screwed with the external thread of the joint body (piece 1), as the tightening torque increases, the outer cone of the hose joint and the inner cone of the steel pipe (piece 3) are in contact and compressed, and the hose joint 1 piece and 3 conical surfaces are in full contact and produce greater pressure, which plays a role of sealing. Due to the leverage of the conical surfaces, the pressure between the conical surfaces is greater.
Conclusion
In the process of selecting hydraulic pipe joints, it is necessary to consider the maximum working pressure of the joint, working temperature, interface size, applicable pipe inner and outer diameter dimensions, whether the installation is convenient, whether it is economical, and other factors. The maximum working pressure of the joint should not be lower than the maximum working pressure of the hose.
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