Rotary Union- Its Components and Role in Rubber Processing

Rubber industry is an extensive industry, which has prompted a massive market to the business tycoons, but the contribution behind the whole trade is not only of one, there are diverse equipments and tools which play a commendable job in flourishing the rubber business. One of the chief tools that is used in the rubber making process is ‘Rotary Union’, without which, the execution of the process could not be made viable.

Rotary Unions

A rotary union also known as ‘swivel joint’ is a mechanism employed to transfer the fluid (under pressure or vacuum) from a stationary inlet to a rotating outlet. The function and significance of rotary union are the crucial factor in the growth and expansion of the organization.


While rotating joints come in many sizes, shapes and configurations for enormous purposes, but commonly, they always are build up of these 4 components:

· Housing: The housing is that element of the rotary union, which is responsible for holding all the other elements together. It is comprised of a threaded inlet aperture, which the hose supplying the channel will be attached to. In general, the housing is stationary (in small rotary unions), but sometimes, in the larger rotary couplings, the housing is bolted to the gyrating drum by using a flange.

· Mechanical Seal: It is the heart of the rotary swivel. Its main function is to prevent the fluid leakage from the rotary union while its operation. The mechanical seals are generally of four types: pusher-type end face, non-pusher type end face, o-ring and lip mechanical seals.

· Bearing: The bearing is yet another major module of the rotary joint which allows either the shaft or the housing to rotate. A rotary union may be comprised of a single or multiple bearing.

· Shaft: The shaft is the component that carries the medium (water, steam, oil, etc.) through the rotary joint to the drum. In smaller couplings, the shaft is rotating whereas, in the larger ones, the shaft remains stationary and the housing rotates.

Role in Rubber Processing

The role of the rotary couplings can never be neglected in the rubber industry. The rotary joints are used in blending and extrusion applications found in the production of rubber products. There are assorted types of rotary joints, such as, water, compressed air rotary joints, steam, hot water joints, hot oil, steam rotary joints, etc., but each of its type has the same role, that is to provide a seal between a stationary supply passage and a gyrating part to permit the flow of fluid through, inside or outside it. The rotary joints increase process efficiency, reduce energy cost, execute the rubber processing and help the rubber industries be more sustainable in their operations.

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