Spring-energized seals are single-acting sealing elements primarily used for sealing reciprocating pistons and rods as well as being suitable for use in rotary, swiveling and static applications.
The seal comprises two components:
an outer sealing element made of high-strength plastic (e.g. PTFE, PE-UHMW) an integral stainless steel spring.
To cover an optimum range of pressures and temperatures, two basic versions have been developed, differing in terms of outer geometry, but especially in terms of spring design and characteristic curves of the springs.
The U- and C-type designations are based on the respective shape of the seal.