O Rings - M Barnwell Services Ltd

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B A R N W E L L‘ O ’ R I N G SBack-Up Rings(also called anti-extrusion rings)The range of products is designed to overcome the extrusion of an‘O’Ring when the system pressure is too great for an unsupported‘O’Ring. Back up rings are usually required on system pressuresabove 105 bar (1500 psi) or where extrusion gaps are excessive.Four types of back up ring are available.BKSBKEBKE/SSpiral back up ring; normally manufacturedfrom virgin PTFE. This is the most commonstyle of PTFE ring, being self adjusting todesign diametrical tolerancesEndless back up ring; normallymanufactured from virgin PTFE. Usedwhere problems are possible, as withrotation of screwed end caps, which wouldcause the spiral type to unwindSingle turn, split back up ring;manufactured as the BKE, but is split tofacilitate ease of assembly in certainapplicationsSupplied unsplit; manufactured fromNBR/polyesterCONTOUREDQuadri-Lip RingsThese are similar to conventional ‘O’Rings and can beused in both dynamic and static applications. Theygenerally conform in size to the BS 1806 Imperialrange and use the same size grooves as the ‘O’Rings.They have several distinct advantages though; in areciprocating movement found in both piston and rodsealing there is no likelihood of the ring twisting.Lighter radial loads are required and lubricationbecomes trapped in the Quadri-Lip profile resulting inlower friction and therefore less wear and longer life.With light pneumatic applications the O.D. and I.D.“flash” present with ‘O’Rings can be a problem,resulting in poor performance - this is eliminatedwith Quadri-Lip rings because the mould parting lineis located between the lips and does not affectmovement.Quadri-Lip rings can be successfully used for rotaryshaft sealing, providing speeds are low and the shaftsurface and lubrication is good.For static sealing the double lip affect of theQuadri-Lip will prove very beneficial.32Telephone +44(0)121 429 8011 (20 lines) Fax +44(0)121 434 3016 Website www.barnwell.co.uk
B A R N W E L L‘ O ’ R I N G S‘O’ Ring Sealing KitsBarnwell Sealing Kits are available in a robust boxthat contains an assortment of the most popularsizes, essential for either emergency repairs orroutine maintenance. Listed below are typicalselections that are held in stock and can be suppliedat short notice. These kits are ideal for maintenanceengineers to provide a quick and reliable choice ofsealing solutions to suit the job in hand.MBK-01N Imperial range BS1806 NBR 70 30 sizesMBK-01V Imperial range BS1806 Viton 75 30 sizesMBK-01S Imperial range BS1806 Silicone 70 18 sizesMBK-02N Metric range BS4518 NBR 70 18 sizesMBK-02V Metric range BS4518 Viton 75 18 sizesMBK-02S Metric range BS4518 Silicone 70 18 sizesMBK-05N Metric range NBR 70 30 sizesMBK-05V Metric range Viton 75 30 sizesMBK-05S Metric range Silicone 70 18 sizesMBG-01 ‘0’Ring Measuring Gauge BS1806‘O’ Ring Splicing KitsThe Barnwell Splicing Kit contains all the necessaryitems to produce hand made ‘O’ Rings for use instatic applications, ideal for non-standard sizes oremergency breakdowns.Each kit contains:Metric and Imperial ‘O’ Ring CordCyanoacrylate AdhesiveSplicing JigTape MeasureKnifeInstruction LeafletMBSK-1 Splicing kit Imperial & Metric NBR cordAvailable in a range of different cord materials.Replacement ‘O’ Ring cord and adhesive is availableseparately.Telephone +44(0)121 429 8011 (20 lines) Fax +44(0)121 434 3016 Website www.barnwell.co.uk33
Page 1 and 2: ‘O’ RingsTheclassicsealingdevic
Page 3 and 4: A Dedication to QualityAt Barnwell
Page 5 and 6: B A R N W E L L‘ O ’ R I N G SI
Page 7 and 8: B A R N W E L L‘ O ’ R I N G S
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Page 36: Contact your local Barnwell Service

O Rings - M Barnwell Services Ltd

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