What maintains contact between the two surfaces of a mechanical seal?

What maintains contact between the two surfaces of a mechanical seal?

• A. Spring Pressure
• B. O-ring Seal
• C. Gasket
• D. Lubricant

Answer: (A)

Spring pressure is what keeps the two seal faces pressed together. The springs provide a preload that holds the faces in contact as the shaft turns, which creates the seal line and prevents leakage. This preload also helps the seal accommodate shaft movement, wear, and thermal expansion so the faces stay touching under varying conditions. The lubricant between the faces reduces friction and wear but doesn’t by itself maintain the contact. An O-ring or gasket and lubrication have roles in sealing and reducing wear in other contexts, but the continuous face-to-face contact in a mechanical seal is maintained by the spring pressure.

Spring pressure is what keeps the two seal faces pressed together. The springs provide a preload that holds the faces in contact as the shaft turns, which creates the seal line and prevents leakage. This preload also helps the seal accommodate shaft movement, wear, and thermal expansion so the faces stay touching under varying conditions. The lubricant between the faces reduces friction and wear but doesn’t by itself maintain the contact. An O-ring or gasket and lubrication have roles in sealing and reducing wear in other contexts, but the continuous face-to-face contact in a mechanical seal is maintained by the spring pressure.