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Rubber sealing ring also called o-ring. The most common seal used in hydraulic, pneumatic and other systems. Applied against gases and fluids.

Related Terms

FLUID COMPATIBILITY

The suitability of filtration medium and seal materials for service with the fluid involved.

BELLOWS

Corrugated cylindrical container which moves as pressures change, or provides a seal during movement of parts.

COMPRESSOR SEAL

Leak proof seal between crankshaft and compressor body in open type compressors.

BALANCE PISTON

Reaction turbines have axial thrust because pressure on the entering side is greater than pressure on the leaving side of each stage. To counteract this force, steam is admitted to a dummy (balance) piston chamber at the low-pressure end of the rotor. Some designers also use a balance piston on impulse turbines that have a high thrust. Instead of piston, seal strips are also used to duplicate a piston's counter force.

COCKET

The official shipping seal; customs clearance form

WIPER SEAL

The shaft/rod seal used to prevent entry of foreign material into moving parts. Example seal on a cylinder rod.

LABYRINTH SEAL

A clearance seal with no friction contact. Used on turbines as shaft seals.

DEEPWELL PUMP

A type of centrifugal cargo pump commonly found on gas carriers. The prime mover is usually an electric or hydraulic motor. The motor is usually mounted on top of the cargo tank and drives, via a long transmission shaft, through a double seal arrangement, the pump assembly located in the bottom of the tank. The cargo discharge pipeline surrounds the drive shaft and the shaft bearings are cooled and lubricated by the liquid being pumped.

MAGNETIC SEAL

A seal that uses magnetic material, instead of springs or bellows, to provide the closing force.

NON-POSITIVE DISPLACEMENT PUMP

A pump that allows slipping in fluid it is pumping. No positive seal between inlet and outlet used.
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