slide 1: A paper rotary joints or rotary union also called rotary couplings rotary swivels is a tool
designed to direct liquid and gases from one point to another under very high pressure. It
provides a mechanical seal between a supply pipe to rotating cylinder or drum. Paper
rotary joints are used in several manufacturing processes to heat cool or transfer liquid
pneumatic or hydraulic power. Rotary unions are used in a wide range of equipment
from small rotary unions for semiconductor industry to large rotary unions for industrial
applications.
Rotary unions come in numerous shapes and sizes. Some are designed so that the material
passes directly through the rotary union on a single port while others are designed for
multiple ports. Many rotary unions come in custom designs. There are four basic
components of rotary union: Mechanical seal bearing shaft and housing.
slide 2: Mechanical Seal – Mechanical seal is the heart of the rotary Union. The seal prevents the
media water air oil etc from leaking outside the rotary joint during its operation.
Generally there are four basic types of mechanical seals in rotary unions- 1 pusher-type
end face mechanical seal 2 non-pusher type 3 lip seals and 4 o-ring seal. Rotary joints
can have more than one seal.
Bearing- Second most crucial part of the rotary joint is the bearing. A rotary coupling can
have one or more bearings. Roller bearings such as tapered roller bearings and ball
bearings or non-roller bearings such as bronze bushings and graphite bearings may be
used in rotary joint.
Shaft-The shaft is the tool that carries the media through the rotary joint into the drum or
roll. In many cases the shaft will revolve with the drum.
Housing- The housing is the device that holds all of the other elements of the rotary joint
jointly. The housing has a creek port which is a threaded port to which the pipe supplying
the media will be attached. The joint may also have an outlet port if the same joint is being
used both to supply liquid to a drum and to remove it from the drum. In smaller rotary
coupling the housing is motionless and in larger one the housing maybe locked with the
drum using a flange.
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