What Is a Ball Joint?

Spherical compensator (also known as spherical joint), mainly rely on the angular displacement of the sphere to absorb or compensate the lateral displacement of the pipeline in one or more directions. The compensator should be used in pairs. A single unit has no compensation ability, but it can be used as a pipeline. Universal joint use.

Spherical compensator is a kind of equipment to solve the thermal expansion and contraction of pipes. It can be widely used in metallurgy, petroleum, chemical industry, electric power, light industry, textile, construction and national defense construction. The specific uses are as follows:

1. Used in thermal pipelines to compensate thermal expansion.

2. Used in rocket launchers and aircraft exhaust facilities to compensate for impact expansion.

3. Used in metallurgy equipment (such as blast furnace, converter, electric furnace, heating furnace, etc.) in the vaporization cooling system and coal ash transportation pipeline system as universal joints.

4. It is used in various pipelines of buildings to prevent the pipeline from being damaged due to uneven subsidence caused by the foundation or earthquake.

There are various arrangements of ball patch, which are more flexible to use, but usually two main layouts are used in the design: one is to arrange two ball patches on horizontal or vertical Z-shaped pipes; Make up.

1. Large compensation capacity, small occupied space, small fluid resistance and beautiful appearance (no filling nozzle).

2. It can be rotated around the axis at any angle and can be bent in any direction. The bending angle is ± 15 °, and a total of 30 ° is recorded.

3. Good sealing performance, its sealing material has large elasticity, low friction coefficient, good lubrication performance, and small rotation torque. The sealing material is made of carbon fiber material produced by Japan Toray Co., Ltd. (high temperature resistance, corrosion resistance, abrasion resistance, fatigue resistance)

4. Due to the large compensation capacity, a group of ball compensation can be arranged at about 300 meters, so it has fewer fixed brackets, saving total investment and energy.

5. It can balance the blind plate force by itself.

6, universal multi-dimensional compensation can be achieved, no matter the pipeline lateral or axial compensation and other arbitrary directions can meet the requirements.

7. The price is one tenth of the import price.

8. The sphere is finished by CNC lathe with high surface finish.

9. The spherical compensator has a large compensation capacity, which is 10 times that of the traditional square compensator.

10. Spherical compensator can save investment.

11. The spherical compensator can reduce heat loss and pressure loss, and save energy.

In summary, the spherical compensator is a new type of pipeline thermal expansion compensation device that is large in compensation capacity, takes up little space, saves investment, saves energy, and is safe and reliable. It is particularly suitable for high-temperature thermal pipelines. Promotion and application.

1. The spherical compensator should be checked for its model, specifications and pipeline configuration before installation. It must meet the design requirements.

2. It is strictly forbidden to use the method of deformation of the corrugated compensator to adjust the installation tolerance of the pipeline, so as not to affect the normal function of the spherical compensator, reduce the service life and increase the load of the piping system, equipment and support members.

3. During the installation process, the welding slag is not allowed to splash on the surface of the wave shell, and the wave shell is not allowed to be damaged by other machinery.

4. After the piping system is installed, the yellow auxiliary positioning members and fasteners used for installation and transportation on the spherical compensator should be removed as soon as possible, and the limit device should be adjusted to the specified position according to the design requirements, so that the piping system can be used under environmental conditions Full compensation capacity.

5. All moving elements of the spherical compensator must not be stuck by external components or limit their range of movement, and normal movements of all moving parts should be guaranteed.

6. During the hydrostatic test, the secondary fixed pipe frame equipped with the compensator pipe end should be reinforced so that the pipe does not move or rotate. For the compensator used for gas medium and its connecting pipeline, pay attention to whether it is necessary to add a temporary support when filling with water. The 96 chloride ion content of the water cleaning solution for the hydrostatic test does not exceed 25 PPM. After the hydrostatic test is over, the accumulated water in the wave shell should be drained as soon as possible, and the inner surface of the wave shell should be dried quickly.

(1) Leakproof

It is found in actual operation that the main leak point of the spherical compensator is the flange where the ball joint is connected to the pipeline. Therefore, the ball joint and the pipeline are best connected by welding, and the flange connection is used as little as possible. The spherical compensator should be arranged as close to the elbow as possible, that is, the ball center distance should be as long as possible.

(2) Anti-shedding

The compensation distance of the ball compensation is long, the fixed bracket is stressed, and the fixed bracket must be firm and reliable. The pipe slide must be long enough (shifted in the opposite direction to the displacement when installed) and leave a certain margin to prevent the pipe from over-temperature operation. Otherwise, it will cause problems such as the long-distance pipe slide bracket being de-shelved.

(3) When space permits, in order to ensure safe operation, it is best to install the ball compensation without cold positioning.

(4) On the long straight pipe sections on both sides of the ball patch, guide brackets are set at a certain distance. The movable brackets should use rolling brackets or sliding trays with Teflon plates to reduce pipeline friction.

(5) When laying multiple pipes in parallel or with large pipes and small pipes in the pipeline, be sure to leave enough space in the place where the ball repairs are arranged centrally to avoid the mutual influence of the ball repairs and ensure the normal free movement of the ball repairs.

(6) When the ball supplement is arranged vertically, the first movable support near the ball supplement must be provided with a spring support (hanging) frame.

(7) When three ball-supporting aerials are laid in a horizontal L-shaped pipeline, a platform must be set under each ball-supporting in order to install a ball-supporting trolley, thereby ensuring the free movement of the ball-supporting. In addition, a sliding support with a long enough horizontal cross-arm should be set under the elbow near the pipeline to ensure that the pipeline slide can not fall down when the pipeline is thermally displaced.