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>> Technical Information - Sealing

Any bearing, housing and support unit that is not suitably sealed against its surrounding environment is unlikely to achieve its full potential, either in terms of performance or life span. The prevention of ingress of foreign materials and contaminants is of paramount importance and should be considered as early in the selection process as possible.

SRB units have inherent advantages over traditional solid bearing arrangements when considering sealing. The spherical location between housing and support ensures that whichever type of seal is used, it will always remain concentric to the shaft.

A wide variety of sealing solutions are available to users of SRB products as "off the shelf" arrangements. This range will cover the vast majority of operating environments found throughout all industries. To cover those situations where a proprietary arrangement is not suitable, SRB Technical Services are able to work closely with designers and end users to develop and manufacture bespoke solutions tailored to specific applications.

SPLIT ROLLER BEARING

A Split Roller Bearing takes up misalignment by means of the spherical outside interface of the housing.

This means the seals remain concentric with the shaftat all times. This is a very effective sealing arrangement.

SPHERICAL ROLLER BEARING

A Spherical Roller Bearingtakes up misalignment within the bearing, the housing is static.

The result of any misalignment is that the seal will be compressed on one side and a gap will open on the other, rending the seal ineffective.

Sealing Arrangements

	Felt Seal This type of seal is supplied as standard with all SRB housings up to a bore size of 300mm. Consisting of felt strips made from blended fibres. Seals are supplied dry and need to be soaked in oil prior to fitting. Max Speed: dN(mm) =150000 Temp Range: -60ºC to +100ºC Shaft Finish: 1.6µm Ra
	Labyrinth Grease Groove For shaft sizes over 300mm, housings are supplied with a close fitting labyrinth groove machined into the housing. No additional seal is added. For harsh environments, alternative sealing arrangements are available. Max Speed: As Bearing Temp Range: As Bearing Shaft Finish: 3.2µm Ra
	Aluminium Triple Labyrinth A precision machined, non-contacting seal suitable for both high speed and general applications. Once fitted the seal revolves with the shaft. The seal grips the shaft via two split O-rings fitted to the bore of the seal. SRB Triple Labyrinth seals are fitted with high temperature Viton cord as standard. Max Spee: As Bearing Temp Range: -20ºC to +175ºC Shaft Finish: 3.2µm Ra Suffix Letters: ATL
	Neoprene Triple Labyrinth The seal is moulded from Neoprene rubber and incorporates a steel centre band. This steel pressing has ends which form an interlocking arrangement and hence secure the seal to the shaft. The seal can be used where restrictions prevent the use of Aluminium (e.g. Mining). Max Speed: dN(mm) =150000 Temp Range: -20ºC to +100ºC Shaft Finish: 3.2µm Ra Suffix Letters: NTL
	Nitrile Single Lip For environments involving moderate liquid splashing but not submersion. Should be avoided where abrasive particles are also present as this can lead to shaft wear in the seal area. High temperature versions are also available. Max Speed: dN(mm) =150000 Temp Range: -20ºC to +100ºC Shaft Finish: 3.2µm Ra Suffix Letters: RSS (RSSHT for high temperature)
	High Temperature Packing A self-lubricating seal based around PTFE and graphite. In order to utilise the highest quality materials available, SRB housings for high temperature applications are machined to suit the High Temperature Packing used. Max Speed: dN(mm) =150000 Temp Rang: -60ºC to +300ºC Shaft Finish: 1.2µm Ra Suffix Letters: HTPS
	Single Lip with Garter Spring and Retaining Plate A more specialised seal for very wet environments with heavy splash. This type of seal is NOT suitable for continuous submersion without due consideration being given to sealing of the housing joint and any other possible points of liquid entry. Please consult SRB Technical Services for more information. Max Speed: dN(mm) =150000 Temp Range: -20ºC to +100ºC Shaft Finis: 0.8µm Ra Suffix Letters: WSRP
	Kevlar Packing Seal This recent addition to the sealing range has proved highly effective in areas having the potential for fine particle contaminants such as Cement or ash. The rings can be arranged in a number of configurations to suit a particular application. Please consult SRB Technical Services for more information. Max Speed: dN(mm) =190000 Temp Rang: -60ºC to +300ºC Shaft Finish: 3.2µm Ra Suffix Letters: LRS