PSS 02-112-400 - Dripless Shaft Seal 1 1/2", 4" Stern Tube

PSS 02-112-400 - Dripless Shaft Seal 1 1/2", 4" Stern Tube

The PSS 02-112-400 Dripless Shaft Seal is an advanced mechanical face seal designed for marine applications. It features a unique sealing system that ensures optimal performance and reliability.

The PSS - PYI Type A PSS Shaft Seal utilizes a mechanical face seal where the sealing surface is established between the flat faces of a rotating stainless-steel rotor and a stationary carbon flange. The carbon flange is securely attached to the bellow's front side with hose clamps, while the back end fits snugly over the stern tube, also secured by clamps. The stainless-steel rotor is mounted on the shaft in front of the carbon flange, compressing the bellow before being fastened to the shaft with set-screws.

This compression maintains constant contact between the rotor and flange, compensating for variable fore and aft movements caused by propeller thrust. The carbon flange is designed to float around the shaft, effectively addressing misalignment and vibration issues.

Sealing the rotor to the shaft are two O-rings recessed into the collar's bore. These O-rings rotate with the shaft and rotor, minimizing 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 1/2"
• (B) Stern Tube Diameter: 4" to 4 1/8"
• (C) Uncompressed Length: 9.405" (Approx. Compression: 1")
• (D) Rotor Diameter: 3.75"
• (E) Stern Cuff Length: 2"