spiral. Figure 7-15, view A, shows how to changethe direction of the spiral. The ring is thenstretched slightly, as shown in view B prior toinstallation into the groove. While the TFE ringis being inserted into the groove, rotate thecomponent in a clockwise direction. This will tendto expand the ring diameter and reduce thepossibility of damaging the ring.When TFE spiral rings are being installed inexternal grooves, the ring should have a left-handspiral. As the ring is being inserted into thegroove, rotate the component in a clockwisedirection. This action will tend to contract the ringdiameter and reduce the possibility of damagingthe ring.In applications where a leather backup ringis called for, place the smooth-grained side of theleather next to the ring. Do not cut leather backuprings. Use a leather backup ring as one continuousring and lubricate the ring prior to installing it,particularly the smaller sizes. If stretching isnecessary for proper installation, soak the backupring in the system fluid or in an acceptablelubricant at room temperature for at least 30minutes.or two backup rings, depending upon the specificseal groove application and width. The Quad-Ring® seal works well in, both hydraulic andpneumatic systems.Many Quad-Ring® seal sizes have beenassigned NSNs and are stocked in the FederalSupply System. Quad-Ring® seals in manu-facturer’s sizes designated as Q1 through Q88 areinterchangeable with O-rings conforming toAN6227. Likewise, Quad-Ring® seals in com-mercial sizes Q101 through Q152 are inter-changeable with O-rings conforming to AN6230in the respective dash sizes from –1 through–52.Therefore, the Quad-Ring® seal stock partnumber uses the AN standard O-ring designationsAN6227 and AN6230 and the commercial Q dashnumber designation. For example, NSNs arefound under such reference part numbers asAN6227Q10 and AN6230Q103. If the letter Qdoes not follow AN6227 or AN6230, the partnumber is an O-ring not a Quad-Ring® seal.If Quad-Ring® seals are not available formaintenance actions, appropriate sized O-ringscan be installed and they work satisfactorily.QUAD-O-DYN® SEALSQUAD-RINGSThe Quad-Ring® seal is a special configura-tion ring packing, manufactured by the MinnesotaRubber. As opposed to an O-ring, a Quad-Ring® seal has a more square cross-sectionalshape with rounded corners (fig. 7-16). The Quad-Ring® seal design offers more stability than theO-ring design and practically eliminates thespiraling or twisting that is sometimes encounteredwith the O-ring.Quad-Rings® seals are completely inter-changeable with O-rings in the sizes offered bythe manufacturer. They may be installed with oneThe Quad-O-Dyn®, also manufactured byMinnesota Rubber, is a special form of theQuad-Ring. The Quad-O-Dyn differs from theQuad-Ring in configuration (fig. 7-17), is harder,is subject to greater squeeze, and is made of adifferent material. The Quad-O-Dyn® seal alsoworks well in O-rings glands.The Quad-O-Dyn® is used in relatively fewapplications. However, for difficult dynamicsealing applications, the Quad-O-Dyn® canperform better than the Quad-Ring. Quad-O-Dyn® rings are installed in submarine hydraulicsystems plant accumulators.Figure 7-16.—Quad-Ring.7-15Figure 7-17.—Quad-O-Dyn® seal.
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