The four sealing points of mechanical seals include:
Sealing between the moving ring and the static ring: This is the main sealing point. The end faces of the moving ring and the static ring are kept in close contact through elastic elements (such as springs or bellows) and medium pressure to form an extremely thin fluid film to balance the pressure and lubricate the end faces.
Sealing between the moving ring and the shaft (or sleeve): This is a static sealing point. The auxiliary sealing ring is used to prevent leakage between the moving ring and the shaft or sleeve.
Sealing between the static ring and the static ring seat: This is also a static sealing point. The contact surface between the static ring and the static ring seat is prevented from leaking through the sealing ring.
Sealing between the gland and the equipment: This is the last static sealing point. The gland and the equipment are prevented from leaking through the sealing ring.
