Stainless steel casting 2BV pump Impeller

What Is a 2BV Pump Impeller?The 2BV series impeller is the core rotating component of a liquid ring vacuum pump (LRVP). It operates by eccentric rotation within the pump casing, creating a liquid ring that forms compression chambers to evacuate air and non-condensable gases from process systems. The 2BV model is one of the most widely adopted liquid ring vacuum pump designs globally, used across chemical processing, pharmaceutical manufacturing, food packaging, paper making, and power plant condenser evacuation.Zibo Geluobao manufactures 2BV pump impellers through investment casting, offering stainless steel and duplex alloy options that deliver significantly longer service life and better corrosion resistance than conventional sand-cast iron or bronze impellers — especially in wet, acidic, or chloride-containing gas environments where standard impellers fail within months.Why Investment Casting for Impellers?Key AdvantagesPrecision blade geometry — Ceramic shell process achieves CT5–CT7 accuracy on blade profiles, maintaining design hydraulic efficiencySmoother blade surfaces — Ra 3.2–6.3 μm as-cast reduces turbulence loss and improves vacuum efficiency vs sand cast Ra 25+ μmNo porosity / no sand inclusion — Eliminates pitting corrosion initiation sites common in sand-cast impellers operating in corrosive gas streamsNear-net-shape blades — Minimal machining required; only bore, keyway, and balance holes need finishingMaterial Selection GuideCF8M (316SS) — General purpose: air/water vapor mixtures, mildly corrosive off-gasDuplex 2205 — Chloride-containing gas streams, seawater vapor, wet CO₂ environmentsSuper Duplex 2507 — Aggressive acid gas service, offshore platforms, high-chloride HCl/Cl₂ traces17-4PH — High-stress applications requiring hardness + corrosion resistance (shaft-mounted designs)SpecificationsCompatible Models2BV 2060 / 2070 / 2071 / 5110 / 5111 / 5121 / 6110 / 6121 / 6131 — or custom per your drawing/specificationCasting ProcessSilica Sol Lost Wax preferred for blade precision; Lost Foam available for larger diametersImpeller Diameter RangeØ80 mm – Ø450 mm (covers full 2BV series range)Weight Range0.5 kg – 35 kg per impellerNumber of Blades8–24 blades depending on model; straight or curved profile per customer specHub DesignSingle-sided hub (most common) or double-sided hub with center bore + keywayMaterial GradesCF8M / CF3M (304L/316L) · Duplex S32205 (2205) · Super Duplex S32750 (2507) · 17-4PH (S17400)Post-Casting ServicesCNC Bore Machining Dynamic Balancing Heat Treatment Pickling & Passivation PT InspectionBalance GradeG2.5 or G6.3 per ISO 1940-1 — dynamic balancing included before shipmentInvestment Casting vs Sand Casting — Impeller ComparisonAttributeInvestment Casting (Ours)Sand CastingBlade Profile Accuracy±0.15–0.30 mm — matches CAD closely±0.8–2.0 mm — manual trimming neededSurface Finish (Blade)Ra 3.2–6.3 μm as-castRa 25–100 μm (requires machining)Blade Uniformity (Batch)Variation <0.05 mm piece-to-pieceVariation 0.3–1.0 mm — balancing inconsistentSand Inclusion / PorosityVirtually zero (ceramic shell)Common defect, especially at thin blade rootsFirst Article Lead Time2–3 weeks from approved drawing5–8 weeks (pattern plate + core boxes)Tooling Cost (New Design)$150–400 (wax pattern)$1,500–5,000 (pattern + cores)Minimum Order1 piece acceptedEconomical MOQ 10+ piecesQuality AssuranceChemical AnalysisOES spectrometer every heat — Cr/Ni/Mo/N verified; ferrite check for duplex grades (target 35–65%)Dimensional CheckCMM verification of bore Ø, blade tip diameter, hub face parallelism, blade pitch consistencySurface InspectionLiquid Penetrant (PT) on all blade surfaces and pressure boundaries — detects micro-cracks invisible to naked eyeDynamic BalanceISO 1940-1 G2.5/G6.3 balancing machine test — certificate provided per batchDocumentationEN 10204 3.1 material cert + balance report + dimensional inspection reportApplicationsOur investment-cast 2BV impellers are used in these industries:Chemical Process Vacuum Systems Pharmaceutical Drying & Degassing Food Packaging Vacuum Forming Paper Making De-aeration Power Plant Condenser Evacuation Oil Refining Vacuum Distillation Plastics Extrusion DegassingLiquid Ring Pump Compatibility: Our 2BV impellers are designed to be direct drop-in replacements for original equipment. If you have an existing 2BV pump and need a spare impeller in a better material (e.g., upgrading from cast iron to 316 or Duplex), send us your old part photo or OEM part number — we'll match dimensions exactly.