O-ring seal

flatcarbongraphite

Rotary joints, also known as rotary unions, rotary swivels, or rotary couplings, are mechanical devices used to transfer fluid from a stationary pipe to a piece of rotating equipment. They are used in rotary equipment to cool, heat or transfer fluid power in the form of steam, heat transfer oil, coolants, hot water, hydraulic fluids, lubricating oils, or air. The rotating equipment can be heat exchanger rolls, machine tool spindles, gear boxes, and air clutches. Rotary joint assemblies contain stationary housing which support a shaft made up of bearings, allowing the shaft to rotate freely within the housing. Spring-loaded mechanical seals are used to seal the fluid within the housing. The mechanical seal faces are selected based on the fluid being transferred, and often the seal faces are made of carbon/graphite material. The self-lubricating carbon/graphite seal rings for rotary joints often have concave or convex sealing faces to accommodate misalignment resulting angular oscillation, or vibration. Excellent mechanical strength and wear resistance make Metcar material ideally suited for these applications. Our self-lubricating, carbon/graphite piston rings and guide rings are used when there is a need for compressed gases that do not contain oil or grease. In a reciprocating compressor, oil-free gases such as air, steam, refrigerants, hydrogen, hydrocarbons, chlorine, nitrogen and oxygen can be compressed to pressures of over 800 psi. Segmented Metcar carbon/graphite rings with overlapped joints are placed in a radial groove in the reciprocating piston with little clearance between the width of the groove and the width of the piston ring.