A spherical bearing is a bearing that permits angular rotation about a central point in two orthogonal directions (usually within a specified angular limit based on the bearing geometry).

Spherical beaing

A knuckle joint is a mechanical joint used to connect two rods under a tensile load when there is a requirement of a small amount of flexibility, or angular moment is necessary. There is always an axial or linear line of action of load

knuckle joint 

A cycloidal drive or cycloidal speed reducer is a mechanism for reducing the speed of an input shaft by a certain ratio. Cycloidal speed reducers are capable of relatively high ratios in compact sizes with very low backlash

cycloidal drive

A Plummer block is a pedestal used to provide support for a rotating shaft with the help of compatible bearings and various accessories.

plummer block

A non-return valve allows a medium to flow in only one direction

Non-return valve

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Seedling

Debutant

Spherical beaing

knuckle joint

cycloidal drive

plummer block

Non-return valve