Which option represents a hydraulic rod seal?

Which option represents a hydraulic rod seal?

• A. O-ring
• B. Rod seal
• C. Cup seal
• D. Piston seal

Answer: (B)

Rod seals sit around the moving cylinder rod to keep hydraulic fluid from leaking along the rod as it extends and retracts. This is their primary job in a hydraulic cylinder, and it’s distinct from piston seals, which block fluid between the piston and the bore. An O-ring is a general-purpose seal used in various applications, not specifically the rod area, while a cup seal is a type that can be used for rod sealing but is a form factor rather than the function. The term that directly identifies the sealing component on the rod is rod seal, making it the correct representation for a hydraulic rod seal.

Rod seals sit around the moving cylinder rod to keep hydraulic fluid from leaking along the rod as it extends and retracts. This is their primary job in a hydraulic cylinder, and it’s distinct from piston seals, which block fluid between the piston and the bore. An O-ring is a general-purpose seal used in various applications, not specifically the rod area, while a cup seal is a type that can be used for rod sealing but is a form factor rather than the function. The term that directly identifies the sealing component on the rod is rod seal, making it the correct representation for a hydraulic rod seal.