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A full-series seal assembly for the Atlas Copco RD22U is the definitive answer to a supply chain problem that affects every operation running this drifter globally: the decision, made under time pressure at a remote maintenance event, about which components to include in the current service. The percussion seal is obviously included. The O-rings—maybe. The wiper ring—often forgotten. The guide ring—not in the standard aftermarket kit. The accumulator check valve O-ring—almost never thought of until it causes a post-service bypass event. A full-series assembly resolves the decision by making it once, at procurement, rather than per event, under pressure.
The RD22U full-series seal assembly contains every elastomeric component that should be replaced at a 450–500 hour percussion service: percussion bore seals, flushing box seals, O-ring set for all valve block and housing interfaces, wiper ring, piston guide ring, and accumulator circuit O-rings. These components are dimensioned to the same bore geometry reference—matched cross-sections, matched durometers, matched lip geometries for the dynamic positions. The operational value of the matched assembly is that the technician installs the kit and closes the circuit with confidence that every sealing interface is at design specification. There are no components left over from a previous service, no substitutions from general stock, no uncertainty about whether the O-ring from last month's supply order fits this month's valve block.
Global Compound Selection for RD22U Full-Series Seal Assembly
|
Region / Condition |
Percussion Seals |
Flushing Seals |
O-Rings |
Supply Example |
|
Standard mineral oil, <75°C |
PU Shore 92 |
NBR lip seal |
NBR |
Sweden, Germany general mining |
|
High temperature (>80°C oil) |
HNBR |
HNBR |
HNBR |
Saudi Arabia, deep Australian sites |
|
Aggressive flushing water |
PU standard |
PTFE-backed |
NBR |
Norway tunnels, NZ quarry, Indonesia |
|
Coal mine HFA-E fluid |
HNBR |
PTFE-backed |
FKM/HNBR |
Canada coal; Elk Valley BC |
|
Cold climate (<−20°C startup) |
PU low-temp validated |
NBR cold-grade |
NBR |
Finland, Russia Siberia, Canada Nunavut |
The RD22U full-series seal assembly is supplied by HOVOO with compound selection guided by the site's operating parameters—hydraulic fluid type, flushing water chemistry, ambient temperature range, and percussion hours per year—rather than as a one-compound-fits-all catalog item. A site in Saudi Arabia receives HNBR throughout; a Norwegian tunneling project receives PTFE-backed flushing seals; a Finnish hard-rock mine receives cold-temperature validated PU percussion seals. The assembly isn't a catalog commodity. It's a configured product matched to the operating environment. Full global supply references at hovooseal.com.
