Seals
In its most basic form, a seal is a ring captured in a groove and is designed to control fluid leakage in reciprocating, oscillating, or rotary motion applications. From this basic function you can derive a multitude of applications, such as seals for rods and pistons, wipers to prevent ingress of foreign matter, or protection devices such as buffer seals. Common materials used to make seals can be polyurethane, rubber, machined plastics or PTFE. Typically, the material type is determined by the specific operating conditions or limits due to pressure, fluid chemical compatibility or temperature.
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Wipers
A wiper is a device used to exclude contaminants from entering the cylinder as the rod retracts.
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Wear Rings
Wear rings are bearing devices designed to hold the rod or piston in line with the direction of motion.
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