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PSS · Shaft Seals

The PSS Shaft Seal is the #1 selling marine mechanical seal worldwide and is installed as standard equipment by many of the worlds most reputable boat builders and boatyards.

The PSS Shaft Seal is also recognized as the premiere retrofit (aftermarket) seal on the world market. Boat builders and boatyards recognize the advantages and value of installing the PSS as it eliminates the maintenance, constant adjustment, and cost associated with traditional packing type glands. Aside from these benefits, the PSS Shaft Seal helps to eliminate water in the bilge (100% watertight) and wear to the propeller shaft.

The PSS Shaft Seal can be easily retrofitted and is available for shafts ranging from 3/4” to 8” (20mm to 203mm).

20 to 95mm (3/4" to 3-3/4") Shaft Diameters

PSS PRO Shaft Seal

Fits 20 to 95mm (3/4" to 3-3/4") shaft diameters
  • 8-10 year maintenance interval
  • Reinforced silicone bellows
  • Single injected carbon stator
  • Shaft Retention Collar (SRC)

PSS type A Shaft Seal

Fits 20 to 95mm (3/4" to 3-3/4") shafts diameter
  • 6 year maintenance interval
  • Standard nitrile bellows
  • Single injected carbon stator

PSS Rudder Post Seals

Fits 32 to 150mm (1-1/4" to 6") shaft diameters
  • Standard nitrile or reinforced silicone bellows

Flange & Bladder System

Fits 32 to 203mm(1-1/4" to 8") shaft diameters
  • Build-to-suit flange adapters
  • Integrated inflatable bladder option

PSS Ceramic Seal

PSS Ceramic Seal
For 70 to 127mm (2-3/4" to 5") shaft diameters
  • Reinforced silicone bellows
  • Dual injected carbon stator
  • Upgraded Nitronic 50 stainless steel rotor
  • Non-conductive ceramic sealing face

100mm (4") and up Shaft Diameters

PSS type B Shaft Seal

Fits 100 to 150mm (4" to 6") shaft diameters
  • Reinforced silicone bellows
  • Dual injected carbon stator
  • Upgraded Nitronic 50 stainless steel rotor

PSS type C Shaft Seal

Fits 165 to 203mm (6-1/2" to 8") shaft diameters
  • Reinforced silicone bellows
  • Dual injected carbon stator
  • Upgraded Nitronic 50 stainless steel Rotor
  • Build-to-suit flange
  • Single injected carbon stator

PSS Rudder Post Seals

Fits 32 to 150mm (1-1/4" to 6") shaft diameters
  • Standard nitrile or reinforced silicone bellows

Flange & Bladder System

Fits 32 to 203mm(1-1/4" to 8") shaft diameters
  • Build-to-suit flange adapters
  • Integrated inflatable bladder option

PSS Ceramic Seal

PSS Ceramic Seal
For 70 to 127mm (2-3/4" to 5") shaft diameters
  • Reinforced silicone bellows
  • Dual injected carbon stator
  • Upgraded Nitronic 50 stainless steel rotor
  • Non-conductive ceramic sealing face

HOW DOES IT WORK ?

The PSS 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 the front side of the bellow with hose clamps, and the back end of the bellow fits over the Stern tube and is secured with hose clamps. The stainless-steel rotor is fit on the shaft in front of the carbon flange. The stainless-steel rotor is used to compress the bellow before the rotor is secured to the shaft with set-screws.
This compression (pre-load) maintains constant contact between the two flat faces of the stainless-steel rotor and carbon flange, allowing the PSS to compensate for the variable fore and aft movement due to propeller thrust. 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 problems. The stainless-steel rotor is sealed to the shaft by two O-rings that are recessed into the bore of the collar. These O-rings rotate with the shaft and stainless-steel rotor and do not experience wear during operation.

How works PSS shaft seal

COMPONENTS

Rotor

A stainless steel rotor that is slid down the shaft and secured with set screws at 90 degrees for maximum holding power.

Bellow

The convoluted bellow clamps onto the stern tube (shaft log) and attaches onto the carbon stator.

Joint mécanique PSS de type A

Carbon Stator

A carbon stator is connected to the rubber below and 'floats' around the shaft. The face of the carbon is finished to a flatness of 4 helium light bands and provides a water tight seal when pressed against the stainless steel rotor.

CERTIFICATES

The PSS Shaft Seal has been thoroughly tested and approved by these certifications.
RINA certification

RINA

Bureau Véritas certification

BUREAU VERITAS

APPROVED BY THE AMERICAN BUREAU OF SHIPPING

ABS

vidéos

What is a PSS Shaft Seal ?

Removing the shaft coupling

PSS FAQ

DEALERS

PSS Shaft Seals are available around the world. Use the map below to find the nearest PSS Shaft Seal dealer to you.

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