PSS Shaft Seal for 50 mm Shaft
SVB item number: 67170
Manufacturer no.: 02-50M-314
The PSS shaft seal is a mechanical face seal that is created between the flat surfaces of the rotating stainless steel rotor and the stationary carbon flange.
Product details
Recommended retail price:
€1,012.19
only
€769.95
-24%
You save: €242.24
4
| in stock
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At a glance!
Product data
- SVB item number 67170
- EAN 8396620083960
- Manufacturer no. 02-50M-314
- Description PSS shaft seal
- Shaft-Ø 50 mm
- For stern tube-Ø 83 - 86 mm
- Length 234 mm
- Hose connection 10 mm
- Water-cooled Yes
- Self-venting Yes
- Floating ring seal Yes
- Maintenance free Yes
- Grease lubricated No
- Material Stainless steel V4A, Rubber, Carbon
Product details
| 1 | 2 | 3 | 4 | 5 |
| Two nitrile o-rings seal the stainless steel rotor to the shaft and will not experience wear. | A primary set screw and a backup set screw (2 sets) are used to secure the stainless steel rotor to the shaft. | A seal is created between the two flat surfaces of the carbon stator and the stainless steel rotor. | Water is fed into the PSS Shaft Seal for cooling/lubricating the seal faces on high speed vessels. | The stationary carbon stator is attached to the nitrile bellow, which is attached to the stern tube (shaft log). |
Rotor
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 are made from 316L stainless steel.
Carbon Stator
The high density, resin impregnated carbon/graphite stator is a space age 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.
Bellow
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 good resistance to weathering. Nitrile rubber's single most important property is its exceptional resistance to oils and non-polar solvents. It also offers good gas impermeability, abrasion resistance and better thermal stability than most general purpose elastomers.
Hose Barb
For high speed vessels it is required that a positive water supply be plumbed to the PSS Shaft Seal for the purpose of lubricating and cooling the seal faces. There are many sources of water supply, review the PSS Shaft Seal Installation Instructions for more information and note all plumbing must follow the standards and practices of proper boat plumbing. In most cases a slow speed boat that does not have a bearing the shaft log does not require positive water feed and can simply be "vented". Ideally the vent line will be run at least 2-3 feet above the water line and is close to the center line as possible to ensure the vent hose is never below the water line, even if the boat heels. Review the PSS Shaft Seal Installation Instructions for more details on venting the seal.
The PSS shaft seal is a mechanical face seal that 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 vessels stern tube with hose clamps and the carbon flange is attached to the front side of the bellows 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 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 steel 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 rotor and do not experience wear during operation.
Note: You must not use any grease on the seals. These mechanical seals are water lubricated.
Please specify when ordering the exact shaft diameter and stern tube outer-dia.
Systems
Product safety
Customers ask customers
Technical question
Anatoly S.
| Jul 14, 2019
Hi. I'm working on design of the drive and I'm considering these PSS. We have a 35 mm shaft which needs sealing. Can you provide me with drawings or any other technical info? I can't find anything on this page. Also I want to ask you if these sealing assemblies can work on the other side of the shaft. When the water comes outside into stern tube.
Answer
Manfred T.
| Jul 15, 2019
Hallo The Shaft seal works like that. The ring is mounted small bolt on the Shaft and the adjustment of the ring have to make to give a little pressure to the rubber. The rubber works like a spring. I think the seal works from both side because only the rubber press the seal to the ring so both side are sealed
Comparison
Availability / Price
Item no.
67170
67162
Customer ratings
Description
PSS shaft seal
PSS shaft seal
Shaft-Ø
50 mm
38 mm
For stern tube-Ø
83 - 86 mm
64 - 67 mm
Length
234 mm
229 mm
Material
Stainless steel V4A, Rubber, Carbon
Stainless steel V4A, Rubber, Carbon
Hose connection
10 mm
10 mm
Maintenance free
Floating ring seal
Water-cooled
Self-venting
Grease lubricated
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