A long radius (long sweep) swivel joint is a type of swivel joint that has a longer radius of curvature than a standard swivel joint. This longer radius allows for smoother rotation and less turbulence, which can improve flow characteristics and reduce wear and tear on the joint. Long radius swivel joints are often used in high pressure applications, such as oil and gas drilling, where smooth rotation and low turbulence are critical.

Here are some of the specifications of long radius swivel joints:
1. Sizes: 1-4 inches
2. Working pressure: 3,000-20,000 psi
3. Materials: Steel, stainless steel, alloy steel
4. End connections: Threaded, flanged, union
5. Working Pressure: 25 Mpa - 70 Mpa

Here are some of the applications of long radius swivel joints:
1. Oil and gas drilling
2. Fluid handling
3. Mud lines
4. Sour gas
5. Acidizing and fracturing
6. Testing lines
7. Crude oil and gas