PSS SHAFT SEAL

Products

PSS Shaft Seal

Packless Sealing System


The PSS Shaft Seal is a mechanical seal that uses a self-aligning carbon-graphite stator to ensure a 100% watertight seal with proven reliability. This seal will eliminate shaft wear and minimize corrosion.

These type of seals are unaffected by engine motion or vibrations. The result is a 100% watertight and totally maintenance-free seal.

All mechanical seals look very similar. There is, however, a big difference in materials used in the components and subsequently in the way the seals will perform.

Product Details

A MECHANICAL SEAL IS CREATED BY THE CONTACT OF A TURNING SURFACE AGAINST A STATIONARY SURFACE.

The stationary surface of the PSS Shaft Seal is a carbon flange held in contact against a stainless steel rotor which turns with the shaft. The carbon flange is attached to the boat by a nitrile bellow which, with the help of water pressure, produces a constant contact between the carbon and the stainless steel ring.

A MECHANICAL SEAL IS CREATED BY THE CONTACT OF A TURNING SURFACE AGAINST A STATIONARY SURFACE.

The stationary surface of the PSS Shaft Seal is a carbon flange held in contact against a stainless steel rotor which turns with the shaft. The carbon flange is attached to the boat by a nitrile bellow which, with the help of water pressure, produces a constant contact between the carbon and the stainless steel ring.

DOUBLE O-RINGS

The nitrile O-Rings are fit inside the stainless steel rotor to guarantee alignment and seal of the rotor to propeller shaft. Nitrile is the material used due to its superior resistance to petroleum products, temperature variations and resistance to tearing. These O-rings are stationary and do not wear.

STAINLESS STEEL ROTOR

The one-piece stainless steel (Type 316) rotor is slid down and secured to the propeller shaft with double set screws. Precision tolerance are maintained by computer controlled lathes. After machining, the rotors are passivated to military specifications for maximum corrosion resistance. The stainless steel rotor should never need replacing under normal operating conditions. Two stainless steel hose clamps are used to secure the bellow at both the stern tube and flange ends.

DOUBLE ALLEN HEAD SET SCREWS

Allen head set screws with cupped ends (to prevent damage to shaft) are threaded into the rotor and secured to the propeller shaft. A second set screw is then threaded into each hole to secure the first screw and to prevent it from possibly backing out. Set screws are treated with a Dri-Loc 204.