{"id":1648,"date":"2026-11-03T17:14:00","date_gmt":"2026-11-03T09:14:00","guid":{"rendered":"https:\/\/www.bosssealing.com\/?p=1648"},"modified":"2026-11-03T17:14:00","modified_gmt":"2026-11-03T09:14:00","slug":"wat-is-in-backup-ring","status":"publish","type":"post","link":"https:\/\/www.bosssealing.com\/fy\/what-is-a-backup-ring\/","title":{"rendered":"Wat is in stipe-ring? Anyti-ekstr\u00fazje-\u00fbntwerp, materialen en wannear't jo ien nedich hawwe"},"content":{"rendered":"<p>In reserve-ring is in flakke, stive ring dy't njonken in elastomeer-seel oan 'e leechdrukside sit en foarkomt dat it seel yn 'e spalte tusken de metalen dielen twongen wurdt. Hy seelje sels net. Hy hat gjin knip, gjin lip en gjin elastysk \u00fbnth\u00e2ld. Syn hiele taak is om de \u00fatstjittingsspalte te sluten, sadat de O-ring d\u00earefter nea yn in romte lytser as himsels streamje hoecht.<\/p>\n<p>De measte yngenieurs komme it \u00fbnderdiel foar it earst tsjin nei in falen: in O-ring mei ien r\u00e2ne \u00f4fknage, in gland fol rubberkr\u00fbmels, en in \u00fbnderh\u00e2ldsteam dat itselde seel elke pear wiken ferfangt. De oplossing is meastentiids in ring dy't minder kostet as de O-ring dy't er beskermet.<\/p>\n<h2>Wat \u00fatstjitting eins is<\/h2>\n<p>In elastomeer \u00fbnder druk gedraacht him foar in part as in floeistof. As 200 bar in O-ring tsjin 'e speling tusken in suiger en in boarring drukt, wurdt it materiaal net gewoan gearperst; it streamt nei it paad fan minste wjerst\u00e2n, dat is de spalte. De spalte op in nije silinder kin 0,15 mm w\u00eaze. Op in fersliten ien kin er 0,5 mm berikke. By dy grutte sil in NBR O-ring fan 80 \u00b0C by 200 bar binnen oeren in sichtbere tonge rubber yn 'e speling triuwe.<\/p>\n<p>Sadree't in tonge foarme is, skuort it bewegende diel dy der\u00f4f. De skuorde r\u00e2ne wurdt in lekpaad, it lek ferheget de pleatslike temperatuer, en de skea ferspriedt him om 'e omtrek. De einst\u00e2n is in oanknaude, flakke ring en in lek dat gjin oanheljen mear stopje kin.<\/p>\n<p>In reserve-ring \u00fbnderbrekt dy searje troch de spalte te besetten mei in materiaal dat by de bedriuwstemperatuer net streamt. It is in meganyske stop, gjin seel.<\/p>\n<h2>W\u00ear't de ring sit<\/h2>\n<p>De posysje is net \u00fbnderhannelber: de reserve-ring giet oan 'e kant fan it haadseel \u00f4f fan 'e druk, nei de \u00fatstjittingsspalte ta. Yn in stanggl\u00e2n dat fan 'e boarringkant \u00f4f \u00fbnder druk stiet, wurdt de O-ring nei de b\u00fbtenr\u00e2ne fan it gl\u00e2n laden en sit de reserve-ring tusken de O-ring en dy r\u00e2ne.<\/p>\n<p>Yn in d\u00fbbelwurkjende silinder wikselt de druk, sadat in inkele reserve-ring mar ien rjochting beskermet. Set twa, ien op elk flak fan 'e O-ring. Twa ringen betsjutte ek dat de groef breed gen\u00f4ch w\u00eaze moat: in standert O-ringgroef dy't allinnich foar de O-ring \u00f4fmjitte is, sil in twadde ring net akseptearje s\u00fbnder de knip sa te ferminderjen dat it seel by lege druk lekt. Groefbreedte, net ringdikte, is wat de mooglikheden foar efter\u00f4f ynbou beheint.<\/p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.bosssealing.com\/wp-content\/uploads\/2023\/07\/Large-size-o-ring-back-up-ring.png\" alt=\"Large diameter rubber O-ring with a PTFE backup ring fitted against one face\" \/><figcaption>In PTFE-reserve-ring op it leechdrukflak fan in grutte O-ring: de ring sl\u00fat de spaltespalte, de O-ring docht it seeljen<\/figcaption><\/figure>\n<h2>De fiif standertkonfiguraasjes<\/h2>\n<p>ISO 3601-4 groepearret anty-\u00fatstjittingsringen yn fiif geometryen. De ferskillen geane oer hoe't de ring op 'e stang of yn 'e groef komt s\u00fbnder snien te wurden, en hoefolle trochgeande stipe er ienris ynstallearre jout.<\/p>\n<table>\n<thead>\n<tr>\n<th>Type<\/th>\n<th>Snijstyl<\/th>\n<th>Ynstallaasje<\/th>\n<th>W\u00ear't it br\u00fbkt wurdt<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>T1<\/td>\n<td>Spiraalsnien (trochgeande rol)<\/td>\n<td>Wrapset oer in stang of yn in groef s\u00fbnder de gearstalling te demontearjen<\/td>\n<td>Fjildreparaasje, grutte diameters, efter\u00f4f ynbou op gearstalde silinders<\/td>\n<\/tr>\n<tr>\n<td>T2<\/td>\n<td>Hoeksnien (sjerp)<\/td>\n<td>Iepenet en klikt oer de stang; einen oerlaapje \u00fbnder druk<\/td>\n<td>Algemien hydraulysk gebr\u00fbk, sawol statysk as dynamysk<\/td>\n<\/tr>\n<tr>\n<td>T3<\/td>\n<td>F\u00east, net snien<\/td>\n<td>Fereasket folsleine tagong; glidet oer it ein fan 'e stang of suiger<\/td>\n<td>Hegste \u00fatstjittingswjerst\u00e2n, loftfeart en hegedrukstatyske ferbiningen<\/td>\n<\/tr>\n<tr>\n<td>T4<\/td>\n<td>Konkaaf hoeksnien<\/td>\n<td>Sjerpsnien mei in profilearre binnenflak<\/td>\n<td>Presyzje-glannen w\u00ear't de ring nau oanslute moat by de O-ringkromme<\/td>\n<\/tr>\n<tr>\n<td>T5<\/td>\n<td>Konkaaf f\u00east<\/td>\n<td>Folsleine tagong fereasket; profilearre binnenflak<\/td>\n<td>Hegedrukglnnen mei krap axiaal romte<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Yn 'e praktyk is T2 wat de measte yndustri\u00eble silinders br\u00fbke, T1 is wat \u00fbnderh\u00e2lds\u00f4fdielingen op 'e planke h\u00e2lde foar needgefal, en T3 wurdt spesifisearre w\u00ear't it gl\u00e2n folslein demontearre wurde kin en de druk de gearstallingsswierrichheid rjochtfeardiget. In T3-ring dy't mei in skroevedraaier oer in stang twongen wurdt, is in ferneatige ring; de snijstilen besteane krekt om dy operaasje te foarkommen. Distrib\u00fasjekatalogussen lykas <a href=\"https:\/\/www.sealsales.com\/backup-rings\" rel=\"nofollow noopener\">Seal Sales reserve-ringen<\/a> litte deselde fiif famyljes sjen mei foarriedmjitten, wat in flugge manier is om te sjen wat \u00fat 'e foarried te krijen is foar't in bewurke \u00fbnderdiel besteld wurdt.<\/p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.bosssealing.com\/wp-content\/uploads\/2023\/07\/L-type-back-up-ring.jpg\" alt=\"L type backup ring machined from engineering plastic for hydraulic glands\" \/><figcaption>In ring mei L-profil foar in stanggl\u00e2n: it profil moat by de groefbreedte passe, d\u00earom wurde efter\u00f4f-ynbou-ringen meastentiids bewurke ynstee fan getten<\/figcaption><\/figure>\n<h2>Materiaalkar<\/h2>\n<p>De ring moat hurder w\u00eaze as de O-ring by bedriuwstemperatuer, mar net sa hurd dat er de boarring krast. Trije famyljes dekke hast elke tapassing.<\/p>\n<table>\n<thead>\n<tr>\n<th>Materiaal<\/th>\n<th>Temperatuer<\/th>\n<th>Drukfermogen<\/th>\n<th>Sterkten<\/th>\n<th>Beheiningen<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Suver PTFE<\/td>\n<td>\u2212200 oant +260 \u00b0C<\/td>\n<td>Goed oant ~250 bar mei krape speling<\/td>\n<td>Leechste wriuwing, brede gemyske wjerst\u00e2n, leechste kosten<\/td>\n<td>K\u00e2ldfloei \u00fbnder oanh\u00e2ldende lading; ferfoarmet yn grutte spalten<\/td>\n<\/tr>\n<tr>\n<td>Folle PTFE (gl\u00eas, koalstof, br\u00fbns)<\/td>\n<td>\u2212200 oant +260 \u00b0C<\/td>\n<td>Goed oant ~400 bar<\/td>\n<td>Hegere druksterkte, bettere slitaazje, minder kruip<\/td>\n<td>Br\u00fbnzen folmiddel kin korrodearje yn guon media; wat mear abrasyf<\/td>\n<\/tr>\n<tr>\n<td>PEEK (net folle of mei koalstof\/grafyt folle)<\/td>\n<td>\u221260 oant +250 \u00b0C kontinu<\/td>\n<td>Oant 600 bar en heger<\/td>\n<td>Hegste stivens en kruipbestindigens, h\u00e2ldt grutte spalten<\/td>\n<td>Hegere kosten, minder foarmber, fereasket in goed oerflak\u00f4fwurking<\/td>\n<\/tr>\n<tr>\n<td>Nylon \/ POM<\/td>\n<td>\u221240 oant +100 \u00b0C<\/td>\n<td>Oant ~250 bar<\/td>\n<td>Goedkeap, stiif, maklik te bewurkjen<\/td>\n<td>Swelt yn wetter en guon glycolen; beheind gemysk berik<\/td>\n<\/tr>\n<tr>\n<td>PU (hege hurdens)<\/td>\n<td>\u221230 oant +80 \u00b0C<\/td>\n<td>Oant ~300 bar<\/td>\n<td>Abrasyfbestindich, tolerearret minne oerflak\u00f4fwurking<\/td>\n<td>Min by hege temperatuer; net foar agressive fluids<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Twa seleksjefallen binne it neamen wurdich. Unfolle PTFE-backupringen kruipen: \u00fbnder in oanh\u00e2ldende statyske lading fan 300 bar by 80 \u00b0C wurdt de ring stadichoan tinner en iepenet de spalt him wer. Folle PTFE of PEEK lost dat op, mar tsjin in priis. De oare fal is nylon yn wetterbasearre fluid. Nylon absorbearret wetter, groeit en kin f\u00eastr\u00fbnje yn de groef, d\u00earom br\u00fbke wetterhydraulika en wetter-glycolsystemen PTFE of PEEK ynstee.<\/p>\n<p>It elastomeer dat beskerme wurdt is like wichtich as de ring. In 70 Shore A-mingsel skreaun neffens <a href=\"https:\/\/www.astm.org\/standards\/d2000\">ASTM D2000<\/a> line-notaasje is in oar ekstr\u00fazjerisiko as in 90 Shore A-mingsel yn deselde groef, en de ringdikte moat de s\u00eaftere fan de twa folgje.<\/p>\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.bosssealing.com\/wp-content\/uploads\/2023\/07\/Carbon-PEEK-back-up-ring-2.jpg\" alt=\"Carbon filled PEEK backup ring for high pressure hydraulic glands\" \/><figcaption>Koalstoffolle PEEK-ringen h\u00e2lde har foarm d\u00ear't unfolle PTFE kruipen soe, tsjin twa oant fjouwer kear de \u00fbnderdielkosten<\/figcaption><\/figure>\n<h2>Wannear't jo ien nedich binne<\/h2>\n<p>Der is gjin inkelde drukdrompel yn hokker standert dan ek, om't ekstr\u00fazje \u00f4fhinget fan de kombinaasje fan druk, spalt, temperatuer en hurdens fan it elastomeer. De wurkbere besl\u00fatregel br\u00fbkt alle fjouwer.<\/p>\n<table>\n<thead>\n<tr>\n<th>Betingst<\/th>\n<th>Oanbefelling<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Under 100 bar, spalt binnen ISO 5597-limiten, 70 Shore A O-ring<\/td>\n<td>Gjin ring nedich<\/td>\n<\/tr>\n<tr>\n<td>100\u2013160 bar, standertspalt<\/td>\n<td>Opsjoneel; set ien op de drukside as fersekering by skokbelaste systemen<\/td>\n<\/tr>\n<tr>\n<td>160\u2013250 bar, of spalt boppe standert<\/td>\n<td>Ien ring op de leechdrukside, folle PTFE<\/td>\n<\/tr>\n<tr>\n<td>Boppe 250 bar<\/td>\n<td>Ien ring standert; PEEK boppe 400 bar of d\u00ear't it spalt 0,3 mm grutter is<\/td>\n<\/tr>\n<tr>\n<td>D\u00fbbelwurkjend, boppe 160 bar<\/td>\n<td>Twa ringen, ien op elk flak fan de O-ring<\/td>\n<\/tr>\n<tr>\n<td>Elke druk mei spalt boppe 0,4 mm<\/td>\n<td>Reparearje earst it spalt; in ring allinnich kompensearret net foar in fersliten boarring<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>De spalt-helte fan dy tabel is wichtiger as de druk-helte. In silinder by 150 bar mei in spalt fan 0,5 mm ekstrudearret flugger as ien by 300 bar mei in spalt fan 0,1 mm. As jo kieze tusken it tafoegjen fan in backupring en it ferfangen fan in fersliten liedbushing, ferfange dan de bushing. Us <a href=\"https:\/\/www.bosssealing.com\/fy\/produkt-kategory\/liedende-eleminten\/\">liedeleminten<\/a> besteane krekt foar dy taak: se h\u00e2lde de suiger konsintrysk sadat it spalt binnen it berik bliuwt d\u00ear't de sealing foar \u00fbntwurpen is.<\/p>\n<h2>Untwerpdetalen dy't beslisse oft it wurket<\/h2>\n<p><strong>Groefbreedte.<\/strong> In inkele backupring hat sawat 1,2\u20131,5 mm ekstra aksjale romte nedich, \u00f4fhinklik fan de ringdikte. Twa ringen hawwe d\u00ear it d\u00fbbele fan nedich. As de groef allinnich foar in O-ring snien is, binne de opsjes in tinnere ring, in bewurke ring dy't de romte fan de O-ring dielt, of in hiel oar sealprofyl. De h\u00fasf\u00eastingskonvinsjes efter dy sifers binne dy't publisearre binne troch <a href=\"https:\/\/www.hallite.com\/en\/hydraulic-seals\/\">Hallite<\/a> foar hydraulyske stang- en suigersealen, en se binne de referinsje d\u00ear't de measte Jeropeeske silinderbouwers fan \u00fatgeane.<\/p>\n<p><strong>R\u00e2neradius.<\/strong> In skerpe groefhoeke skaaf in PTFE-ring by de ynstallaasje en lit resten yn de gland efter. In radius fan 0,2\u20130,4 mm op de groefyngong is normale praktyk en kostet neat yn de bewurkingsfaze.<\/p>\n<p><strong>Oerflak\u00f4fwurking.<\/strong> De boarring of stang \u00fbnder de ring moat net r\u00fbger w\u00eaze as sawat Ra 0,4 \u00b5m foar dynamyske tsjinst. PTFE tolerearret in r\u00fbger oerflak as PEEK; in PEEK-ring dy't op in skansearre boarring rint, sil de boarring slite.<\/p>\n<p><strong>Termyske \u00fatsetting.<\/strong> PTFE expands roughly ten times as much as steel per degree. Rings above 200 mm diameter need a diametral clearance allowance in the groove, or they will close up at 80 \u00b0C and grip the rod.<\/p>\n<h2>Installation Checks<\/h2>\n<p>Four checks catch nearly every backup ring installation error we see in returned parts:<\/p>\n<ul>\n<li>The ring is on the correct side. On a single-acting gland, the flat face of the ring faces the O-ring and the O-ring faces the pressure.<\/li>\n<li>The cut, if there is one, is offset from the O-ring&#8217;s own parting line and closed to a gap under 0.3 mm. A scarf joint that sits open at assembly stays open.<\/li>\n<li>The ring turns freely in the groove by hand. A ring that binds was machined to the wrong width or has absorbed fluid.<\/li>\n<li>The assembly was lubricated with system fluid, not grease that is incompatible with the elastomer. Lithium grease on an EPDM O-ring is a slow failure; on a PTFE ring it is harmless.<\/li>\n<\/ul>\n<h2>Adjacent Parts People Confuse With Backup Rings<\/h2>\n<p>Three parts get mixed up in requisitions, and ordering the wrong one wastes a cycle.<\/p>\n<p><strong>Slitringen<\/strong> (also called guide rings or guide bands) are radially loaded, carry side load, and are usually wider and thicker than a backup ring. They sit in their own groove, not next to the seal lip. <strong>Gaskets<\/strong> are flat static seals with no anti-extrusion function at all. <strong>Retaining rings<\/strong> are metal and hold parts in place, not fluid.<\/p>\n<p>The confusion is understandable because a filled PTFE wear ring and a filled PTFE backup ring can come out of the same press with the same compound. They differ in section, tolerance and groove. A backup ring used as a wear ring will fail in shear; a wear ring used as a backup ring will not close the gap. Distributors such as <a href=\"https:\/\/www.darcoid.com\/\" rel=\"nofollow noopener\">Darcoid<\/a> publish both families side by side, which makes the section differences easy to compare before ordering.<\/p>\n<p>For the sealing side of the assembly, our <a href=\"https:\/\/www.bosssealing.com\/fy\/produkt-kategory\/pakking-ringen-stipe-ring\/\">gasket, washer and backup ring range<\/a> covers the standard sections in PTFE, filled PTFE and PEEK, and the <a href=\"https:\/\/www.bosssealing.com\/fy\/produkt-kategory\/rubber-o-ringx-ring\/\">O-ring- en X-ringberik<\/a> covers the elastomer these rings protect. Machined PEEK and PTFE parts outside standard sections come through our <a href=\"https:\/\/www.bosssealing.com\/fy\/produkt-kategory\/produkten-fan-technyske-plestik\/\">engineering plastics<\/a> line, which is usually the faster route for retrofit rings on obsolete equipment.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<p><strong>Can I fit a backup ring to an existing groove without machining?<\/strong><br \/>Sometimes. If the groove already has 1.2 mm or more of axial space beyond the O-ring, a thin ring fits. If not, a machined ring with a reduced section can share the groove, but check that O-ring squeeze stays above about 8% before you commit. Below that, the assembly leaks at low pressure and the ring is irrelevant.<\/p>\n<p><strong>Does a backup ring increase friction?<\/strong><br \/>It adds a small amount on the pressure side, and only while pressure is applied. In most cylinders the increase is not measurable against the rod seal&#8217;s own friction. In slow servo applications it matters, and a low-friction filled PTFE ring is the usual answer.<\/p>\n<p><strong>Why did my PTFE backup ring split after a few weeks?<\/strong><br \/>Three causes, in order of frequency: the ring was installed on the wrong side and took the full extrusion load itself; the groove was too narrow, so the ring had nowhere to expand; or the ring was virgin PTFE in a continuous high-load static joint and cold-flowed until it cracked.<\/p>\n<p><strong>Is a backup ring the same as a T-seal?<\/strong><br \/>No. A T-seal is a single part with an integral anti-extrusion profile, used where axial space is too tight for an O-ring plus two rings. It solves the same problem by a different route.<\/p>\n<p><strong>What is the cost difference between PTFE and PEEK rings?<\/strong><br \/>For a 50 mm ring, expect PEEK at roughly two to four times the price of a filled PTFE ring. On a cylinder that runs 250 bar with a well-maintained bore, filled PTFE is the correct choice and PEEK is money spent on capability you will not use. Above 400 bar, or where clearance cannot be tightened, the PEEK ring is cheaper than the failures it prevents.<\/p>","protected":false},"excerpt":{"rendered":"<p>Hoe stipe-ringen O-ringekstr\u00fazje stopje: ISO 3601-4-typen, PTFE, folle PTFE en PEEK-materiaalfergeliking, seleksjeregels foar romte en druk, en kontr\u00f4les by ynstallaasje.<\/p>","protected":false},"author":1,"featured_media":497,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1648","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"How backup rings stop O-ring extrusion: ISO 3601-4 types, PTFE vs filled PTFE vs PEEK materials, and when high-pressure hydraulic glands need one.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"boss\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.bosssealing.com\/fy\/what-is-a-backup-ring\/\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.5\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"BOSS Sealing Solutions - Hydraulic seal and pneumatic seal factory\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"What Is a Backup Ring? 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