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| Myth | Reality | |------|---------| | "More spring force equals better sealing." | Higher spring force increases wear and heat. Use minimum closing force that maintains face contact. | | "All carbon-graphite is the same." | Carbon can be resin-impregnated, antimony-impregnated, or pure. Each has a different PV limit. | | "Flatness doesn’t matter for low pressure." | Even at 50 psi, face waviness causes localized hot spots and vaporization. | | "You don’t need a flush plan for clean water." | Water has low lubricity. Without a flush, carbon faces will run dry and crack. | To answer these questions, engineers have long relied