What is the difference between a molded spherical rubber expansion joint and a spool rubber expansion joint?

Molded spherical and spool rubber expansion joints serve similar purposes but differ in design and application.

1. Molded Spherical Expansion Joints: These consist of a rubber section between two metal flanges. These joints are typically designed as a single molded piece that allows for greater flexibility and movement in multiple directions. They are ideal for applications where space is limited and require ease of installation. The spherical shape helps accommodate angular misalignment and reduces stress on connected piping systems.
2. Spool Rubber Expansion Joints: These joints are typically designed as a single molded piece that allows for greater flexibility and movement in multiple directions. They are often used in larger piping systems and can handle higher pressure and temperature variations. Spool joints are generally more robust and suited for applications where significant axial movement is expected.

Both types have their advantages depending on the specific requirements of the pipe system, including movement, pressure, and installation space.