RKA-SS Stainless Steel Solid Shaft Pumps — High-Flow Industrial Performance

If your operation needs more water on target—without sacrificing durability in harsh environments—the AR North America RKA-SS Series deserves a look. These stainless-steel triplex plunger pumps pair AISI 316L heads with bronze connecting rods and Viton® O-rings for long life in chemical, marine, and heavy washdown duty. Running at 1750 RPM on a 24 mm solid shaft, RKA-SS strikes the balance between flow, pressure, and continuous-duty reliability.
Why stainless matters

• Corrosion resistance that lasts: 316L heads shrug off salt, caustics, sanitizers, and solvents.
• Stable performance at temperature: Viton seals maintain integrity under heat and chemical exposure.
• Lower lifetime cost: Fewer head swaps, longer intervals between seal/valve service.

Key features at a glance for RKA-SS Stainless Steel Solid Shaft Pumps

• AISI 316L stainless head for superior corrosion resistance.
• Bronze connecting rods for strength under continuous load.
• Aluminum crankcase + 15 oz oil capacity to keep things cool and lubricated.
• 24 mm solid shaft, 1750 RPM for direct-couple or pulley drives.
• Viton O-rings to handle heat, oils, and aggressive cleaners.

RKA-SS Stainless Steel Solid Shaft Pumps – Model highlights (flow • pressure • EBHP)

• RKA-SS2.3G15N — 2.3 GPM • 3000 PSI • ~4.7 EBHP
•  Compact, sanitary washdown and precision cleaning skids.
• RKA-SS3G15N — 3.0 GPM • 3000 PSI • ~6.2 EBHP
•  Small OEM frames where stainless is mandatory.
• RKA-SS3.6G12N — 3.6 GPM • 3000 PSI • ~7.4 EBHP
•  Step-up flow for CIP rinse and tool cleaning.
• RKA-SS4.2G15N — 4.2 GPM • 3000 PSI • ~8.6 EBHP
•  Versatile plant washdown and equipment bays.
• RKA-SS7G22N — 7.0 GPM • 2200 PSI • ~10.6 EBHP
•  High-volume sanitation lines and wide-coverage rinse.

Motor sizing tip: Match motor HP to EBHP with 10–20% margin for plumbing losses, temperature, and duty cycle.

Where RKA-SS Stainless Steel Solid Shaft Pumps thrives

• Food & Beverage / USDA — corrosion-proof heads, consistent sanitation.
• Pharma — reliable washdown in controlled environments.
• Marine & Offshore — stainless construction vs. salt and spray.
• Chemical plants — compatible with detergents/solvents; check media.
• Municipal & wastewater — high-flow rinse, facility sanitation.
• Industrial contractors — rugged, continuous-duty washdown rigs.

Selecting your RKA-SS Stainless Steel Solid Shaft Pumps

1. Start with duty: Do you need 3000 PSI spot power or 2200 PSI wide-area flow?
2. Size by nozzle set: Match GPM to tip selection and desired impact.
3. Drive method: Direct-couple at 1750 RPM or pulley with correct ratio and alignment.
4. Environment: For hot water/chemicals, confirm system components (hoses, valves, sealants) match temperature and chemistry.
5. Instrumentation: Add a gauge and pulsation dampener at discharge for smoother flow and quicker setup.

Service & maintenance for RKA-SS Stainless Steel Solid Shaft Pumps
Field-serviceable kits keep uptime high:

• Valve kit (AR2514) — restores check valve performance.
• Piston kit Ø18 (AR2552) — refreshes plunger group.
• Water seals Ø18 Viton (AR2516) — heat/chemical-resistant sealing.
• Oil seals (AR2528) — protect the crankcase.
• Support rings Ø18 (AR1829) — maintain piston alignment.

RKA-SS Stainless Steel Solid Shaft Pumps Routine best practices

• Keep suction plumbing short, straight, and oversized to prevent cavitation.
• Filter inlet water; flush after chemical use.
• Respect temperature/pressure limits for seals and heads.
• Follow oil intervals; verify level through the sight glass.

FAQs
How is RKA-SS different from RK-SS?
 RKA-SS extends flow capability (up to 7 GPM) while keeping the stainless head and continuous-duty design.
Can I run hot water?
 Yes—within seal and pump temperature limits. Confirm downstream components are hot-water rated.
What motor frame works best?
 Most builds use 1750 RPM industrial motors sized to the model’s EBHP; verify shaft coupling, base, and alignment.

Bottom line: If you need stainless durability with higher flow in a 1750 RPM, continuous-duty package, the RKA-SS Series delivers. From food and pharma to marine and municipal sanitation, these pumps provide the corrosion resistance, serviceability, and output that keep critical cleaning operations running day after day.

For additional industry standards and technical resources, visit: https://www.pumps.org/