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PSS 02-118-200 - Dripless Shaft Seal 1 1/8", 2 Stern Tube
The PSS - PYI Type A PSS Shaft Seal is designed for reliable performance in marine applications. This mechanical face seal features a unique sealing mechanism that ensures durability and efficiency.
The sealing surface is established between the flat surfaces of a rotating stainless-steel rotor and a stationary carbon flange. The carbon flange is securely attached to the front side of the bellow with hose clamps, while the back end fits over the stern tube, also secured by hose clamps. The stainless-steel rotor is mounted on the shaft in front of the carbon flange, compressing the bellow before being secured with set-screws.
This pre-load compression maintains consistent contact between the stainless-steel rotor and carbon flange, allowing the PSS to adapt to the variable fore and aft movements caused by propeller thrust. The over-bored design of the carbon flange permits it to "float" around the shaft, effectively compensating for misalignment and vibrations.
The stainless-steel rotor is sealed to the shaft using two O-rings recessed into the collar's bore. These O-rings rotate with the shaft and rotor, ensuring minimal 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: 2" to 2 1/8"
- (C) Uncompressed Length: 6.875" (Approx. Compression: 3/4")
- (D) Rotor Diameter: 2.375"
- (E) Stern Cuff Length: 1.5"
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