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Marine Device Accessories
CWM Anti-Shock Stern Shaft Seal
1. Product Features
         Elastic sealing structure is being used to achieve automatic compensation of both axial and radial displacement, so that jamming of the shaft can be avoided when system goes under big external shock force. Sealing performance is thus guaranteed.
         The shaft works without abrasion due to its fluid sealing structure.
         Maintenance of static and dynamic sealing rings can be done offshore in a quick and easy way, which saves cost and increases on-duty time of the ship.
         No grease is required.
         The product is strong in anti-corrosion, and its life span is same as that of the ship.
2. Structural Data Unit: mm
d 110 145 160 190 215 240 250 400 350 400 450 510
D 405 340 375 405 460 460 480 580 640 680 760 820
D 1 278 310 345 375 413 413 433 540 580 640 704 764
D 2 250 280 315 345 374 374 390 480 540 580 645 705
L 325 340 360 360 374 374 380 440 440 440 510 540
n 8 8 8 8 8 8 8 8 8 12 12 12
d 1 10 12 12 12 16 16 16 20 20 20 24 24
※Listed in this table are structural data for standard design. Structure of the device can be customized according to user requirements.
3. Technical Data
1. Range of shaft diameter: Φ110mm～Φ550mm.
2. Compensable displacement in axial and radial direction: ≤20 mm.
3. Air pressure in the inflated seal compartment: 0.3～0.5 Mpa.
4. Cooling water pressure: 0.01-0.40 Mpa.
5. Leaking volume (per 100mm in diameter): ≤1.5 L/h.
6. Working temperature (surface): ≤65℃.
7. Life span: same as ship.

4. Model Selection
1. Size of the seal is determined by parameters like shaft diameter and structure of the place of installation. If the shaft comes with shaft liner, size of the seal should be determined by diameter of the shaft liner.
2. Enough operation space should be allocated for maintenance engineer during design and model selection.
3. Customized design can be done according to user requirements, such as size, structure and interface.

5. Industrial Standard
GJB4000-2000     General Norms for Vessel
GJB2479-95         General Norms for Vessel's Stern Shaft Seal
GJB150-86           Environment Test Methods for Military Device