PRO Shaft Seal 2-1/4" Shaft & 4" Tube
The PSS PRO Shaft Seal is a mechanical face seal utilizing our proven stainless steel and carbon sealing components but adds reinforced silicone bellows, a secondary shaft retention collar, 316 Stainless Steel hose clamps (rolled edges and non-perforated), and an optional Nitronic 50 rotor upgrade (for highly corrosive environments). Designed specifically for applications that will require increased durability and resistance to harsh, corrosive, high pressure, and otherwise demanding environments. The PSS PRO Shaft Seal is a specialized mechanical seal suitable for various applications, with unmatched performance.
As with PSS Type A & B Seals, The PRO 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 a heavy-duty silicone bellows attached to the vessel’s stern tube (shaft log), with 316SS hose clamps. The stainless-steel rotor is fitted on the shaft in front of the carbon flange and is used to compress the bellows, the rotor is then secured to the shaft with set screws, and the shaft retention collar is installed. This compression (pre-load) maintains constant contact between the two mating faces of the stainless-steel rotor and carbon flange, allowing the PSS to compensate for the variable axial 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 from the drive-line. The stainless-steel rotor is sealed to the shaft by two O-rings recessed into the rotor's bore. These O-rings rotate with the shaft and the stainless-steel rotor and therefore do not experience wear during operation.
Specifications:
- Temperature Limits: -13°F to 425°F (-25°C to 220°C)
- Pressure Limits: 40 PSI (2.75 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 formed silicone / fabric
Product Dimensions:
- Shaft Dia. (A) 2-1/4"
- Stern Tube Dia. (B) 4" to 4-1/8"
- Uncompressed Length (C) 9.675"
- Approx. Compressed Length 8.675"
- Rotor Diameter (D) 4.2"
- Stern Cuff Length (E) 1.3"
Shipping
Most orders ship on the same business day or the next business day. Some orders ship directly from the manufacturer, and these may take an additional 1-2 days to process, depending on the manufacturer. Contact us to confirm ship times.
We currently offer FREE 2-day shipping on all orders over $50 to the contiguous 48 states in the USA.
Flat rate shipping of $7.95 USD for orders under $50 within the contiguous 48 states.
Overnight shipping rates available at checkout.
Shipping for orders to states or US territories outside of the contiguous 48 states will be calculated at checkout.
30-Day, No-Hassle Returns
To return an item, send an email to info@secondreef.co. Please include your full name and order number in your email.
Returns must be requested within 30 days of the receipt of your order. The product must be returned unopened in the original packaging. We do not accept returns of used products.
Refunds are subject to a 5% restocking fee to cover the non-refundable credit card processing fees we incur and the administration required.
View our full shipping and returns policies here.
