Description
The Type B PSS Shaft Seal is a mechanical face seal. The sealing surface is created between the flat surfaces of the rotating stainless-steel rotor and the stationary carbon flange. The stationary carbon flange is attached to the front side of the bellows with hose clamps, and the back end of the bellows fits over the Stern tube and is secured with hose clamps. The stainless-steel rotor is fitted on the shaft in front of the carbon flange. The stainless-steel rotor compresses the bellows before the rotor is secured to the shaft with set screws. This compression (pre-load) maintains constant contact between the two flat faces of the stainless-steel rotor and carbon flange, allowing the PSS to compensate for the variable fore and aft movement due to propeller thrust. In addition, the carbon flange is over-bored to the shaft diameter allowing it to “float” around the shaft and thus compensate for most misalignment and vibration problems. The stainless-steel rotor is sealed to the shaft by two O-rings recessed into the collar’s bore. These O-rings rotate with the shaft and stainless-steel rotor and do not experience wear during operation.
Temperature Limits: -13°F to 425°F (-25°C to 220°C)
Pressure Limits: 10 PSI (0.68 BAR)
Shaft RPM Limits: 7,000 RPM
Carbon Graphite: Lapped to 4 HLB (0.000044″ tolerance)
Super Duplex 2507: Faced to -/= 13 Ra
Bellows Material: Reinforced mandrel formed silicone / fabric
How Does It Work?
- Step 1: This clamp assembly maintains the PSS Type B preload / compression without the need for set screws.
- Step 2: A seal is created between the two flat surfaces of the carbon stator and the stainless steel rotor.
- Step 3: Water is fed into the PSS Shaft Seal for cooling/lubricating the seal faces on high speed vessels.
- Step 4: The stationary carbon stator is attached to the nitrile bellows, which is attached to the stern tube (shaft log)
- Step 5: Stainless steel rings are fit to the bellows for increased strength, support and durability.
- Step 6: Hose clamps secure the PSS Type B Shaft Seal to the stern tube and onto the carbon stator.
- Step 7: Hose clamp tail protection, Clamp Jackets.
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