PSS Seal will be closed on 11/28 and 11/29 for Thanksgiving.
01-25M-114
$377.00 USD
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This "Low Speed" PSS Shaft Seal is only for vessels that will not exceed 10 knots.
The "Low Speed" PSS Type A Shaft Seal is identical to the PSS Type A Shaft Seal. The only difference is the "Low Speed" does not have a hose barb fitting for venting or water supply. This "Low Speed" PSS Shaft Seal is only for vessels that will not exceed 10 knots.
The PSS Type A Shaft Seal is a high-performance, mechanical seal system that prevents water from entering the vessel through the stern tube, ensuring a leak-free and reliable seal around the propeller shaft. Constructed with durable, marine-grade materials, the PSS Type A features a precision-machined stainless steel rotor, nitrile bellows, and carbon composite stationary seal. Its design eliminates the need for traditional stuffing boxes and packing glands, reducing friction and wear while enhancing efficiency and longevity.
This low-maintenance solution offers excellent resistance to heat, corrosion, and marine environments, making it ideal for a wide range of vessels, from recreational boats to commercial ships. Easy to install and compatible with various shaft sizes, the PSS Type A Shaft Seal ensures smooth sailing, offering peace of mind for boat owners and operators alike.
1. Two nitrile o-rings seal the stainless steel rotor to the shaft and will not experience wear.
2. A primary set screw and a backup set screw (2 sets) are used to secure the stainless steel rotor to the shaft.
3. A seal is created between the two flat surfaces of the carbon stator and the stainless steel rotor.
4. The stationary carbon stator is attached to the nitrile bellow, which is attached to the stern tube (shaft log).
The PSS stainless steel rotor is slid down the shaft and is secured to the shaft with set screws at 90° for maximum holding power. Precision tolerances are maintained by computer controlled lathes. The faces have a number 9 micro finish and are perpendicular to the bore to prevent run-out as the collar rotates. The carbon graphite stator will polish the face of the rotor during the first few minutes of operation. The stainless steel rotor should not need to be replaced under normal operating conditions. The stainless steel rotor used on the PSS Type A Shaft Seal is made from 316L stainless steel.
The high density, resin impregnated carbon/graphite stator is a composite that is first mixed, molded and then formed under pressure. The blanks are then baked, machined and lapped. The face of our carbon is finished to a flatness of 4 helium light bands (measured .000044" of variation over entire lapped surface). The grade of carbon used in the PSS has an operating temperature over 500° Fahrenheit (+260° Celsius), and cannot melt if the seal runs dry, unlike a rubber lip seal or plastic face seal. The high density of the carbon greatly increases the longevity and wear resistance. Several commercial vessels have recorded over 40,000 (over 4-1/2 years of continuous operation) engine hours on the same, original components. The carbon should not need to be replaced under normal operating conditions.
The PSS Type A Shaft Seal bellow is made from rubber (Nitrile), and has a temperature rating of -25°F to +225°F (-31°C to +107°C). Nitrile is known for its resistance to weathering. Nitrile rubber is exceptionally resistant to oils and non-polar solvents. It also offers good gas impermeability, abrasion resistance, and better thermal stability than most general purpose elastomers.
