Which item is a type of hydraulic seal?

Which item is a type of hydraulic seal?

• A. Copper washer
• B. O-ring seal
• C. Sealant tape
• D. Metal gasket

Answer: (B)

Hydraulic seals are designed to prevent fluid leakage under pressure between moving or mating surfaces. An O-ring seal does exactly that: a circular cross-section elastomer placed in a groove and compressed between surfaces so the elastomer deforms to fill the gap and stop leakage, functioning well for both static and dynamic sealing. Its elasticity, broad fluid compatibility, and ability to handle pressure make it the typical type of hydraulic seal used in many components. The other items don’t fit as a hydraulic seal in the same way: a copper washer seals by crushing metal to form a one-time seal and doesn’t provide a reusable elastomeric seal; sealant tape is used to seal threads and not the mating surfaces in hydraulic joints; metal gaskets are flat seals that can work in some cases but don’t offer the versatile, durable sealing behavior of an elastomer O-ring in hydraulic systems.

Hydraulic seals are designed to prevent fluid leakage under pressure between moving or mating surfaces. An O-ring seal does exactly that: a circular cross-section elastomer placed in a groove and compressed between surfaces so the elastomer deforms to fill the gap and stop leakage, functioning well for both static and dynamic sealing. Its elasticity, broad fluid compatibility, and ability to handle pressure make it the typical type of hydraulic seal used in many components. The other items don’t fit as a hydraulic seal in the same way: a copper washer seals by crushing metal to form a one-time seal and doesn’t provide a reusable elastomeric seal; sealant tape is used to seal threads and not the mating surfaces in hydraulic joints; metal gaskets are flat seals that can work in some cases but don’t offer the versatile, durable sealing behavior of an elastomer O-ring in hydraulic systems.