PSS

Shaft Seal for 50 mm Shaft

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SVB price: €526.01
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€554.00
Excl. VAT, excl. shipping costs.
This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.
pcs.
€526.01 This is a NET-price excluding German VAT. Shipments to countries outside of the EU may be subject to import duties and taxes.

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Available variants:
Item no.
67170
EAN
8396620083960
Model no.
02-50M-314
Type
shaft seal PSS
fits Shaft
50 mm
Stern tube-Ø
83 - 86 mm
Length
23.4 cm
Hose connection
10 mm
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Product details



 

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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.

Documents

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Manual
PDF, 1,34 MB
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Manual
PDF, 523,69 KB
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Manual
PDF, 107,53 KB

Customers ask customers

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Technical question

Question:
User image of Anatoly S.
Anatoly S. asked
on Jul 14, 2019
English
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:
User image of Manfred T.
Manfred T. answered
on 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

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Finland
4/25/2013
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Das is die Besten aus State of the Art wellendictungs.
2/16/2013
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Germany
12/5/2012
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Der Einbau ist entsprechend der Anleitung relativ einfach. Es kann nur schwer werden, die zu erzeugende Vorspannung hinzubekommen. Das hängt davon ab, wie gut man neben der Welle arbeiten kann. In der Theorie auf der Werkbank ist natürlich alles einfach. Ich hatte aber keinerlei Probleme. Wie gut die Dichtung funktioniert, kann ich leider erst in der kommenden Saison beurteilen. Gruß Jens
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3/13/2013
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Bei der Montage stellte sich fest dass das Karbon Gehäuse nicht der Richtigen Bohrungsabmessung entspricht. Die Montage musste abgebrochen werden. Die prompte Reaktion DER SVB ist hervorragend denn das Problem mit SVB am Freitag besprochen führte zu einem Ersatz am nächsten Dienstag im Hause. Daneben ist mitzuteilen dass die Montage keine schwierige Aktion ist und mit normalem Heimwerker Tüchtigkeit problemlos aus zu führen ist. Die Funktionalität muss sich beim wieder ins Wasserlegen meines Schiffes (sloep) erweisen. Bin aber zuversichtlich dass das in Ordnung geht. Frans Brevet
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