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]
A reversed lip seal doesn't leak immediately. It seals the wrong direction — and that's the dangerous version of the failure. A percussion seal installed with the lip facing away from the high-pressure side seals adequately at idle but allows b...
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The lubricant used during seal installation isn't just an assembly convenience — it's the first fluid that contacts the seal compound, and using the wrong one degrades the seal before it sees a single percussion cycle. Petroleum-based greases s...
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Skipping the flush and installing new seals into a contaminated circuit is the second most expensive mistake in rock drill maintenance — second only to not changing the seals at all. The contamination that caused the previous seal failure doesn...
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The single most expensive measurement mistake in seal ordering isn't measuring the wrong dimension — it's measuring the installed seal rather than the groove. An installed seal is compressed; its cross-section and inner diameter are both smalle...
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Impact mechanism seals and feed mechanism seals operate in completely different regimes and fail for completely different reasons — yet both are lumped into 'seal kit' ordering without distinguishing them. The impact mechanism seal runs at 40&n...
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They use the same seal types but not the same specifications — and the distinction matters in the percussion circuit above all other circuits. Mining drills in production drilling applications run continuous percussion for 25–35 minutes p...
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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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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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