O-Ring - seals.ru

1 O-Ring1 EditionJanuary2002 Company profiles3A General Technical Dimensions and product O-Ringrangeofsizes(includingorderingexam plesandinstructionsonpage109) O-Ringdimensionsforstraightthreadtubefit tingsizes, Special Isolast (FFKM) Roundcordrings(buttvulcanised) O-Ringsfreeofsubstancescausingproblemswi thpaintwetting( Labs-free ) General quality criteria and storage + ShambanBusak + Luyken was founded in 1954as aMarketingcompanytosupplyO-Ringstothe German + , ,thecompanychangedthenametoBusak + Shamban.

2 Sincethen Busak+ Shambanhasgrown to world wide network of R&D Centres,Manufacturing Facilities, Marketing Companies +Shambanhasstrategicallianceswithseveral well-chosen third party suppliers. The sale ofproducts is carried out with 33 Marketing +Stosatisfythecustomerdemandsandprovide an extensive service, which covers the 1994 the quality assurance system has of the group members and partners are :Ohrmann Montagetechnik GmbH,M hnesee, GermanyWiththestate-oftheartlaboratories aswellasthethreeR&Dcentres,B+ +Shambanhasdevelopedsurfacetreatmentsfor elastomer O-Rings, offering a variety of co-operation with German companies for theproduction of automatic assembly equipment and + Seals AB, SwedenSkegaABwasfoundedin1932andatthatti meitwasoneproductonly.

3 1948 the O-Ring was introduced on the SwedishmarketwhenSkegastartedthemanufact uringofspecialO-RingsfortheSwedishAirFor ce, fundamentalpart ofthebusiness for several years. Since 1989 the addition to the ISO 9001 requirements, the qualitysystem has since 1999 been third party approved beone ofthemost important issues, which means that theenvironmental effects of the business are constantlyreduced, from the choice of material and all the waythroughtheproductionlinetotheendofthe product material groups are handled in the laboratory, , low temperature materials according production is mainly focused on O RingsDowty O Rings was set up in 1961 to produce highvolumes of elastomeric O-Rings.

4 With 40 years ofexperience in producing premium quality elastomericO-Rings, Dowty O Rings produces and sells over sexpertiseliesinprovidingcustomisedsolut ionsfor an extensive range of automotive and industrialapplicationsincluding:Automoti veHFuelInjectionSystemsHFuelLineConnecto rsHAntilockBrakingSystemsHAirConditionin gSystemsHDieselsystemsHSteeringandTransm issionSystemsIndustrialHHydraulicsandPne umaticsHWaterandGassupplysystemsHCompres sorsandVacuumSystemsWithastrongreputatio nbuiltonperformance,reliability& value, together with QS 9000 & ISO 140001accreditation,DowtyORingsiscommitt edtocontinuousimprovement, , company is committed to lean manufacturinginitiativesinitsdriveforzer odefectqualitysupplies.

5 Whilstoffering better service reliability at an Ring7A General DescriptionO-Rings offer the designer an efficient and economicalsealing element for a wide range of static or production methods and its ease of use havemade the O-Ring the most widely used wide choice of elastomer materials for both standardand special applications allow the O-Ring to be used toseal practically all liquid and gaseous are vulcanised in moulds and are characterisedby their circular form with annular cross section. Thedimensions of the O-Ring are defined by the insidediameter d1 and the cross section d2 (Figure 1).

6 Cross sections of approx. to 40 mm and insidediameters up to 5,000 mm and more are 1 O-Ring dimensioningAdvantagesCompared with other sealing elements, the O-Ring hasa wide range of advantages:-Simple, one piece groove design reduces hardwareand design costs-Compact design allows smaller hardware-Easy, foolproof installation reduces risk-Applicable to a wide range of sealing problems, static,dynamic, single or double acting-Wide compound choice for compatibility with mostfluids-Ex stock availability of many sizes worldwide for easymaintenance and ApplicationO-Rings are used as sealing elements or as energising el ements for hydraulic slipper seals and wipers and thuscover a large number of fields of application.

7 There areno fields of industry where the O-Ring is not used. Froman individual seal for repairs or maintenance to a qualityassured application in aerospace, automotive or O-Ring is used predominantly for staticsealing applications:-As a radial static seal, for bushings, covers, pipes,cylinders-As an axial static seal, for flanges, plates, in dynamic applications are recommended onlyfor moderate service conditions. They are limited by thespeed and the pressure against which they are to seal:-For low duty sealing of reciprocating pistons, rods,plungers, sealing of slowly pivoting, rotating or spiral move ments on shafts, spindles, rotary transmission lead throughs, Method of operationO-Rings are double acting sealing elements.

8 The initalsqueeze, which acts in a radial or axial directiondepending on the installation, gives the O-Ring its initialsealing capability. These forces are superimposed by thesystem pressure to create the total sealing force whichincreases as the systeme pressure increases (Figure 2).Under pressure, the O-Ring behaves in a similar way toa fluid with high surface tension. The pressure istransmitted uniformly to all 2 O-Ring sealing forces with and withoutsystem pressureO Ring9B Technical ElastomersEquipment manufacturers and end users expect sealingsystems to operate leak free and to maintain long servicelife.

9 Reliability is crucial to effective low maintenance costoperations. To find the perfect sealing solution in eachindividual case both material performance and sealdesign are critically important. One of the main usedmaterial groups for sealings are the elastomers. Theyshow good properties like elasticity or good following tables provide a summary of the variouselastomer material groups. B + S can offer a largenumber of materials within each group. If no particularspecifications are given for the material, standard NBR(Nitrile Rubber) in 70 Shore A will be supplied (seechapter " Standard compounds").

10 Table I ElastomersDesignationTrade Name*AbbreviationISO 1629 ASTM 1418B + SAcrylonitrile Butadiene Rubber(Nitrile Rubber)Europrene Krynac Nipol N Perbunan NTBreon NBRNBRNH ydrogenated Acrylonitrile Butadiene RubberTherban Zetpol HNBRHNBRHP olyacrylate RubberNoxtite Hytemp Nipol AR ACMACMAC hloroprene RubberBaypren Neoprene CRCRWCE thylene Propylene Diene RubberDutral Keltan Vistalon Buna EP EPDMEPDMES ilicone RubberElastoseal Rhodorsil Silastic Silopren VMQVMQSF luorosilicone RubberSilastic FVMQFVMQFT etrafluorethylene Propylene Copolymer ElastomerAflas FEPMTFE / P**WTButyl RubberEsso Butyl IIRIIRWIS tyrene Butadiene RubberBuna S Europrene Polysar S SBRSBRWBN atural RubberNRWRWRF