These joints connect a flow of liquid or vapour from a stationary supply piped to a rotating machine part, such as a roll, dryer or cylinder. Rotary pressure joints fitted with carbon rings are widely used in the paper industry. They also find application in the textile, plastics, rubber, petro chemical, food and other industries handling liquids and vapours up to temperatures of 350

These rings are highly specialized products and used as shaft seals in fans, water and steam turbine installations, nuclear power stations and hydroelectric schemes. Gland rings are of two types Tenon types and Wedge types.