PSS 02-300-434 - Dripless Shaft Seal 3", 4 3/4" Stern Tube

PSS 02-300-434 - Dripless Shaft Seal 3", 4 3/4" Stern Tube

The PSS 02-300-434 is a mechanical face seal designed for marine applications. 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 it 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.

Additionally, 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, which rotate with the shaft and do not experience wear during operation.

Specifications

• Shaft Diameter (A): 3"
• Stern Tube Diameter (B): 4-3/4" to 4-7/8"
• Approximate Length (C): 10.3125"
• Approximate Compression: 1"
• Rotor Diameter (D): 5"
• Stern Cuff Length (E): 2.5"

Performance Limits

• Temperature Limits: 5°F to 225°F (-15°C to 107°C)
• Pressure Limits: 15 PSI (1 BAR)
• Shaft RPM Limits: 10,000 RPM

Materials

• Carbon Graphite: Lapped to 4 HLB (0.000044" tolerance)
• 316SS / Nitronic 50: Faced to 9-12 Ra
• Bellows Material: Molded Nitrile - PVC