Within a hydraulic cylinder, immense force is generated to perform critical work—from lifting heavy loads to precise industrial automation. At the core of this force generation is a component that must be perfectly sealed: the piston. Piston seals are the unsung heroes responsible for containing this power, directly influencing the force, speed, and efficiency of your entire hydraulic system.

PEEK backup rings are widely used in ultra-high-pressure sealing fields with harsh working conditions. In petroleum and natural gas drilling equipment, they adapt to ultra-high pressure and high-temperature downhole working environments, protecting drilling tool sealing systems from medium erosion and pressure extrusion.

O-rings are the most widely used elastomeric sealing components in hydraulic, pneumatic, and industrial fluid systems due to their simple structure, low cost, and reliable static and dynamic sealing performance.

Skeleton shaft oil seals are one of the most critical sealing components in mechanical equipment, widely used in engines, gearboxes, hydraulic systems, pumps, and automotive machinery.

Skeleton oil seals are indispensable core sealing components in modern mechanical manufacturing, widely applied to rotating shafts of automobiles, hydraulic equipment, industrial motors, engineering machinery and other devices. Their primary functions include locking internal lubricants, preventing oil leakage, and isolating external dust, moisture and corrosive impurities to extend the service life of mechanical parts. TC, SC and VC are the three most mainstream types of inner skeleton oil seals in the global market. Due to similarities in external appearance and installation methods, many engineers and procurement personnel often encounter difficulties in type selection, which may trigger sealing failure, equipment downtime and increased maintenance costs. This article systematically elaborates on the structural characteristics, core differences, pros and cons of TC, SC and VC skeleton oil seals, and clarifies their applicable working conditions to provide reliable references for targeted type selection in practical engineering projects.