SS304 Polished Stainless Steel Mechanical Pump Seal 25‑65 mm

A mechanical seal is a precision-engineered device that prevents fluids from leaking where a rotating shaft exits a pump housing. It typically includes two flat sealing faces—one rotating and one stationary—that press together under a spring\\\'s force, with a microscopic fluid film separating them during operation . These seals are widely used in centrifugal pumps, including thermic fluid (hot‑oil) systems.

How It Works

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  During operation: Pump rotation creates a fluid film via hydrodynamic effect; spring pressure maintains precise film thickness (on the order of microns) between faces. This lubricates and cools the interface while preventing leakage .

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  At rest: Spring pressure brings faces into contact, stopping fluid escape even when hydrodynamic pressure is absent .

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A very small, controlled leakage is normal—it maintains cooling and lubrication—but vastly less than packing-based systems
For thermic fluid pumps, manufacturers offer seals rated to 300–350 °C (and even beyond). They use high-temperature materials—silicon carbide faces, Viton/PTFE secondary seals, stainless or alloy bellows, and robust spring assemblies . Often integrated in air‑cooled pump designs, these seals eliminate the need for external cooling
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