The hydraulic seal must restrict fluid from escaping its cylinder application. And hydraulic seals must also prevent foreign materials from entering such applications. Alongside of these will be the ability protected related equipment or machinery from corrosion. The seals need to retain its ability to deal with high pressure applications. They also need to continue supporting different types of machinery. The seals typically move in rotary motions. But they are also utilized for reciprocating motions.
Hydraulic seals are single or double acting. Single acting seals will only be used for one axial direction. Double acting seals will be used in both directions and for the production of the reciprocating motion.
Alongside of hydraulic seals being manufactured will be pneumatic alternatives as well as shaft seals. Shaft seals also act in high pressure environments. A wide variety of seals and their parts and components could be catalogued for the novice industrialist. But briefly put, this catalogued list will include piston seals, rod seals, symmetrical seals, rotary shaft seals, static seals and oil and grease seals. Another category could be added here in the meantime. This is the ring list. Among the rings manufactured are V rings, O rings, backup rings, wear rings and buffer rings, not to mention iron piston rings and gaskets.
For different specific purposes, hydraulic seals will be made from a variety of materials. Materials used in the manufacturing process include nitrile, polyurethane, fluorocarbon, silicon, nylon, nickel, bronze and glass. Rubber is also used. And certain hydraulic seals will be molded from fabric reinforced rubber as well as leather.
Other materials used in the manufacturing processes include the terms PTFE, POM and EPDM, PTFE is used as part of bronze filling or nickel filling processes. And FPM is linked to fluorocarbon.