33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
Accumulator seals fail for a different reason than percussion seals — they fail from nitrogen, not from hydraulic oil. The high-pressure accumulator is charged to 50–90 bar N₂ on the gas side. The diaphragm or piston seal separates that g...
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At 200 bar and above, standard Shore 90 PU seals experience a failure mode that doesn't appear at lower pressures: extrusion into the backup ring gap. At 160–185 bar, the seal deforms elastically under pressure and recovers on the return stroke...
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The manufacturers' catalogs will say no. The dimensional reality is more nuanced — and understanding exactly where dimensions converge and diverge prevents both false economies and unnecessary rejections. Atlas Copco and Sandvik percussion bore...
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Most seal kit complaints trace back to a simple problem: the kit didn't include everything the application actually requires. A kit labeled 'complete' for an RD18U that omits the accumulator diaphragm isn't complete — it's a partial kit with a ...
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Every aftermarket supplier claims OEM equivalence. The difference shows up at 250 hours, not at installation. OEM seals are manufactured to groove geometry specifications that are specific to each model — the lip angle, the backup ring clearanc...
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A seal kit that looks right and measures wrong causes the same failure as one that never fit at all — it just takes 200 hours to show it. The cross-section dimension tolerance matters most: a 0.2 mm oversize cross-section in an NBR O-ring gener...
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The question is wrong — and the wrong answer costs money. NBR and FKM aren't competitors for the same application; they perform in different temperature and chemical windows. NBR lasts longer in standard mineral oil circuits below 100°C. FK...
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Dust environments don't kill seals through direct abrasion — they kill them through a three-step cascade that takes 80–120 hours to complete. Step one: dust particles above 15 μm bypass the wiper seal because the wiper lip has softened...
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Seal fracture within the first 100 operating hours almost always points to installation error. Seal degradation that begins after 150–200 hours and accelerates toward 300 hours almost always points to wrong material selection. The timeline is t...
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The two failure modes produce the same symptom — pressure loss, reduced percussion energy, rising oil temperature — but they require completely different repairs. Trying to diagnose internal leakage without distinguishing the source resul...
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Control valve seal leaks behave differently from percussion bore leaks — they show up in the wrong place at the wrong time. A percussion bore leak appears during drilling, under load. A control valve seal leak typically appears at idle, or duri...
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The problem isn't cold itself — it's the transition from cold to operating pressure. NBR compound at −20°C has a Shore hardness approximately 15–18 points higher than its rated value at 20°C. When a drill starts percussion a...
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Welcome to HOVOO, a Chinese seal factory. Production of PU, Rubber and PTFE seals. The seals include O-ring, piston seal, rod seal, Gray ring and gas seal.
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