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PSS 02-118-114 - Dripless Shaft Seal 1 1/8", 1 1/4" Stern Tube
The PSS - PYI Type A PSS Shaft Seal is an advanced mechanical face seal designed for optimal performance in marine applications. It features a unique sealing mechanism that combines a rotating stainless-steel rotor with a stationary carbon flange, ensuring a tight seal even under varying conditions.
The stationary carbon flange is securely attached to the front of the bellow using hose clamps, while the back end fits snugly over the stern tube, also secured with hose clamps. The stainless-steel rotor is mounted on the shaft, applying compression to the bellow. This pre-load is crucial as it maintains constant contact between the rotor and the flange, allowing the seal to adapt to the forward and backward movements caused by propeller thrust.
Designed for flexibility, the carbon flange is over-bored to the shaft diameter, enabling it to "float" and effectively compensate for misalignment and vibrations. Sealing is further enhanced by two O-rings that are recessed in the collar, which rotate with the shaft and rotor, ensuring they remain free from wear during operation.
Specifications
- Temperature Limits: 5°F to 225°F (-15°C to 107°C)
- Pressure Limits: 15 PSI (1 BAR)
- Shaft RPM Limits: 10,000 RPM
- Carbon Graphite: Lapped to 4 HLB (0.000044" tolerance)
- 316SS / Nitronic 50: Faced to 9 Ra
- Bellow Material: Molded Nitrile - PVC
Dimensions
- (A) Shaft Diameter: 1 1/8"
- (B) Stern Tube Diameter: 1 1/4" to 1 3/8"
- (C) Uncompressed Length: 6.875" (Approx. Compression: 3/4")
- (D) Rotor Diameter: 2.375"
- (E) Stern Cuff Length: 1.5"
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