Shaft Sealing Systems

DH Porter & Company manufacture a range of traditional shaft sealing components to suit a wide variety of marine propulsion systems.

Our product range includes:

• Stern tubes
• Stern bearing housings
• Flexible glands
• Stuffing boxes - fixed and stud type
• Oil seal glands

For modern, low-maintenance sealing solutions, we are the NSW stocking distributor for the PSS (Packless Sealing System) shaft seal - a proven dripless system trusted by commercial and recreational operators alike.

The PSS shaft seal is a mechanical face seal. The seal is created between the flat surfaces of the rotating stainless steel collar, the stationary carbon flange and a rubber bellows.

The bellows is attached to the vessel stern tube (note: specify stern tube diameter when ordering) with hose clamps and the carbon flange is attached to the front side of the bellows with hose clamps. The stainless steel collar is fit on the shaft in front of the carbon flange. The stainless steel collar is then used to compress the bellows before the collar is secured to the shaft with set screws. This compression (pre-load) maintains contact between the faces and allows the PSS to compensate for the thrust from the propeller.

The carbon flange is bored larger than the shaft diameter, allowing it to 'float' around the shaft and thus compensate for most misalignment and vibration problems. The stainless collar 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 collar and do not experience wear during operation.