Description: Double mechanical seals are widely used on reactors and agitators. With two sets of seal faces, they rely on an isolation-fluid system to provide dynamic sealing at the shaft end. They suit flammable, explosive, toxic, volatile, high-vacuum, or other duties where medium leakage and air ingress are not permitted.
Dual-seal protection: the medium-side primary seal blocks the vessel contents, and the atmosphere-side secondary seal blocks isolation-fluid leakage. The two seals form a double barrier that reduces medium-leakage risk.
Isolation barrier: the sealed intermediate chamber is filled with isolation fluid to stop the vessel medium from leaking out while also preventing outside air from entering, protecting the reaction system.
Cooling and lubrication: the isolation fluid cools, flushes, and lubricates the friction faces of the rotating and stationary rings, carrying away frictional heat and preventing face burnout from dry running.
It consists of medium-side rotating and stationary rings, atmosphere-side rotating and stationary rings, elastic compensation springs, a sleeve, O-ring auxiliary seals, and an isolation-fluid chamber, with a matched isolation-fluid balance-tank circulation system. The space between the two seal-face sets is the isolation chamber, through which isolation fluid is introduced. Isolation-fluid pressure is generally 0.05–0.1 MPa above the vessel working pressure. In operation the rotating ring turns with the shaft; the spring keeps the rotating and stationary ring faces in contact, and sealing is achieved by an extremely thin liquid film on the faces.
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