The function of the garter spring in lip seals is to

The function of the garter spring in lip seals is to

• A. Increase pressure on the shaft
• B. Decrease friction
• C. Increase leakage tolerance
• D. Limit thermal expansion

Answer: (A)

The garter spring provides preload to the seal lip so it stays pressed against the shaft. This keeps a consistent sealing contact, especially as internal pressure tends to push the lip away or as the shaft experiences wear or runout. By maintaining that contact, leakage is reduced and the seal remains effective across pressure changes. It’s not primarily about reducing friction or about tolerating more leakage or handling thermal expansion—the spring’s main function is to ensure the lip stays against the shaft to maintain a reliable seal.

The garter spring provides preload to the seal lip so it stays pressed against the shaft. This keeps a consistent sealing contact, especially as internal pressure tends to push the lip away or as the shaft experiences wear or runout. By maintaining that contact, leakage is reduced and the seal remains effective across pressure changes. It’s not primarily about reducing friction or about tolerating more leakage or handling thermal expansion—the spring’s main function is to ensure the lip stays against the shaft to maintain a reliable seal.