Correct Installation Steps For Rotary Joints

The rotary joint should be installed correctly according to the requirements of the installation and use manual, otherwise its sealing performance and service life will not be fully utilized.

1, The specific steps for assembling and installing unidirectional rotary joints and matching equipment are as follows:

1. Connect the metal hose and transition joint (or flange) directly to the rotary joint, and use a workbench pliers to clamp the rotary joint housing during installation to prevent damage to the seal.

2. When the hollow shaft is connected to the rotating body through a threaded connection, a layer of white lead oil or polytetrafluoro raw material tape is generally applied to the thread, and a tool is used to clamp the hollow shaft (usually designed with a wrench clamping plane) and screw it into the center of the threaded connection hole of the rotating body until it is tightened.

3. When the hollow shaft is connected to the rotating body using a flange, a thick and uniform gasket (such as a copper gasket or PTFE gasket) should be added at the end of the protruding flange hollow shaft. Then, the matching part and screw hole of the rotating body end should be aligned and fixed with bolts. When tightening the bolts, they should be tightened to the angle and then tightened, and the torque should be equal.

4. Assemble the stop rotation and load-bearing lifting structural components of the rotary joint, and adjust the concentricity of its shell and hollow shaft to prevent shell vibration or rotation during the installation and use of the rotary joint.

5. The connection between the external pipe and the matching rotating body of the bidirectional inner pipe fixed rotary joint is the same as that of the unidirectional rotary joint, but the difference is the installation of the inner pipe.

6. The connection method between the inner pipe and the end cap of the rotary joint is generally using tapered pipe threads and pipe threads, which are connected in the opposite direction to the rotation direction of the matched rotating body, and in the same direction as the rotation direction of the outer pipe connected with threads or matched rotating bodies. When the outer pipe is connected by flange, after the inner pipe is threaded to the end cover, the end of the inner pipe must be locked inside the end cover with a nut.

7. During installation, align the inner pipe from the end hole of the outer pipe to the screw hole on the end cover of the rotating joint and tighten it. Then, send the inner pipe into the inner cavity of the matching rotating body. If using a siphon type, adjust the siphon elbow pipe mouth downwards, and then fix and connect the outer pipe with the matching rotating body.

8. The connection assembly between the outer tube and the matching rotating body of the bidirectional inner tube rotary joint is the same as that of the unidirectional rotary joint, with the difference being the installation assembly of the inner tube.

9. Before installing the outer pipe, assemble the inner pipe with the matching rotating body. The inner tube of this structure is generally connected to the rotating body through threads, and its rotation direction is opposite to that of the rotating body.

10. Remove the end cover of the rotary joint. When packing is used to seal the inner and outer pipes, the packing gland and stop pin (some rotary joints are designed with this part) should be removed. Depending on the situation, loosen the packing or remove the packing, then align the inner pipe with the center of the outer pipe and install it. Fix the outer pipe with the matching rotating body, and then assemble the inner pipe packing gland, end cover, etc. in reverse order according to the original disassembly sequence.