SKU:86668
PRO Shaft Seal 2" Shaft 3-1/2" 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 vessels 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.
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The PSS Shaft Seal PRO model is engineered to provide reliable sealing performance for demanding marine and industrial applications. Designed specifically for 2-inch shafts and 3-1/2-inch stern tubes, this mechanical face seal incorporates advanced materials and reinforced components to withstand harsh environments. Its stainless steel and carbon sealing surfaces ensure a robust seal, while features like silicone bellows and a secondary shaft retention collar enhance durability and ease of installation.
The seal operates by creating a tight contact between the rotating stainless-steel rotor and the stationary carbon flange, maintaining a consistent seal even with shaft axial movement caused by propeller thrust. The carbon flange is over-bored to allow for floating, accommodating misalignment and vibration, which helps extend the seal’s lifespan. The rotor is fitted with two O-rings that rotate with the shaft, preventing wear and ensuring a long service life. The seal's design handles high pressure and temperature conditions, making it suitable for use in demanding environments where reliability and durability are critical.
Constructed with high-quality materials such as molded silicone bellows, 316 stainless steel, and optional Nitronic 50 for highly corrosive environments, the PSS PRO Shaft Seal offers excellent resistance to corrosion and high pressures. It supports shaft speeds up to 10,000 RPM and temperature ranges from -13°F to 425°F, making it versatile across various operating conditions. The seal’s dimensions and reinforced construction make it ideal for applications requiring increased durability, especially in high-pressure or corrosive settings where standard seals might fail.
Installation is straightforward with features like rolled edges on hose clamps and a design that allows for easy adjustment of pre-load, ensuring continuous contact between sealing surfaces. The seal’s compact length and precise fit contribute to its effectiveness in tight spaces. Whether used in marine propulsion, industrial machinery, or other demanding applications, the PSS Shaft Seal PRO offers unmatched performance with reliable sealing, long service life, and resistance to harsh operating conditions.
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