The regulator of my AIr Arms FTP900 has failed and one of the four O-rings inside is found to be very hard. That O-ring is black in color. I am not sure if the hardness is due to aging or the original material is harder than usual ( e.g. NBR 90 ). May I know if regulators require harder O-rings because there are moving parts inside ?
Air Arms What type of O-rings is best for regulators ?
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Looking at Dreamliner diagrams, the little o-rings in their regulators are NBR 90, but all the other ones around the regulator are 70. Which would be the moving part o-rings.
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There SHOULD be a diagram showing all the parts including o-rings & their hardness rating that you can access. Have you gone to Air Arms website & looked for schematics?
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The user manual has an exploded diagram of the rifle and a parts list but the internals of the regulator is not shown
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Go to Air Arms, click Service in the drop downs, then Support & Dowloads, then find your gun & click. Manuals that come with guns rarely go too deeply into internals. You'll have to click on Discontinued Models to find your gun but there IS a chart that lists parts (I just looked).
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Just an fyi-
If you use a urethane o-ring of the same hardness-90 durometer, it should last a bit longer(wear-wise and chemical resistance-wise) than butyl rubber(nbr).
If you use a urethane o-ring of the same hardness-90 durometer, it should last a bit longer(wear-wise and chemical resistance-wise) than butyl rubber(nbr).
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Hardening of the O-ring at the small end of the regulator’s piston is a result of thermal stress. For adjustable regulators, the same occurs with the O-ring on the adjuster screw.
An elastomer with better high-temperature properties will last longer. Viton, or its generic material callout FKM, is a good example.
www.airgunnation.com
An elastomer with better high-temperature properties will last longer. Viton, or its generic material callout FKM, is a good example.
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