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Stainless steel casting 2BV pump Impeller
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Stainless steel casting 2BV pump Impeller
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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 Advantages
- Precision blade geometry — Ceramic shell process achieves CT5–CT7 accuracy on blade profiles, maintaining design hydraulic efficiency
- Smoother blade surfaces — Ra 3.2–6.3 μm as-cast reduces turbulence loss and improves vacuum efficiency vs sand cast Ra 25+ μm
- No porosity / no sand inclusion — Eliminates pitting corrosion initiation sites common in sand-cast impellers operating in corrosive gas streams
- Near-net-shape blades — Minimal machining required; only bore, keyway, and balance holes need finishing
Material Selection Guide
- CF8M (316SS) — General purpose: air/water vapor mixtures, mildly corrosive off-gas
- Duplex 2205 — Chloride-containing gas streams, seawater vapor, wet CO₂ environments
- Super Duplex 2507 — Aggressive acid gas service, offshore platforms, high-chloride HCl/Cl₂ traces
- 17-4PH — High-stress applications requiring hardness + corrosion resistance (shaft-mounted designs)
Specifications
Compatible Models 2BV 2060 / 2070 / 2071 / 5110 / 5111 / 5121 / 6110 / 6121 / 6131 — or custom per your drawing/specification Casting Process Silica Sol Lost Wax preferred for blade precision; Lost Foam available for larger diameters
Impeller Diameter Range Ø80 mm – Ø450 mm (covers full 2BV series range) Weight Range 0.5 kg – 35 kg per impeller Number of Blades 8–24 blades depending on model; straight or curved profile per customer spec Hub Design Single-sided hub (most common) or double-sided hub with center bore + keyway Material Grades CF8M / CF3M (304L/316L) · Duplex S32205 (2205) · Super Duplex S32750 (2507) · 17-4PH (S17400) Post-Casting Services CNC Bore Machining Dynamic Balancing Heat Treatment Pickling & Passivation PT Inspection
Balance Grade G2.5 or G6.3 per ISO 1940-1 — dynamic balancing included before shipment Investment Casting vs Sand Casting — Impeller Comparison
Attribute Investment Casting (Ours) Sand Casting Blade Profile Accuracy ±0.15–0.30 mm — matches CAD closely
±0.8–2.0 mm — manual trimming needed
Surface Finish (Blade) Ra 3.2–6.3 μm as-cast Ra 25–100 μm (requires machining) Blade Uniformity (Batch) Variation <0.05 mm piece-to-piece Variation 0.3–1.0 mm — balancing inconsistent Sand Inclusion / Porosity Virtually zero (ceramic shell)
Common defect, especially at thin blade roots
First Article Lead Time 2–3 weeks from approved drawing 5–8 weeks (pattern plate + core boxes) Tooling Cost (New Design) $150–400 (wax pattern) $1,500–5,000 (pattern + cores) Minimum Order 1 piece accepted Economical MOQ 10+ pieces Quality Assurance
Chemical Analysis OES spectrometer every heat — Cr/Ni/Mo/N verified; ferrite check for duplex grades (target 35–65%) Dimensional Check CMM verification of bore Ø, blade tip diameter, hub face parallelism, blade pitch consistency Surface Inspection Liquid Penetrant (PT) on all blade surfaces and pressure boundaries — detects micro-cracks invisible to naked eye
Dynamic Balance ISO 1940-1 G2.5/G6.3 balancing machine test — certificate provided per batch Documentation EN 10204 3.1 material cert + balance report + dimensional inspection report
Applications
Our 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 Degassing
Why Geluobao Impellers? No tooling. No minimum order. Send us your 3D drawing — first article in 2-4 weeks. - Replicast CS process: zero carbon defects, near-wrought density - Blade precision: ±0.15 mm profile accuracy, Ra 3.2-6.3 μm as-cast - Materials: CF8M (316), 2205 Duplex, 2507 Super Duplex, 17-4PH - Balance: ISO 1940-1 G2.5/G6.3 — dynamic balancing included - single piece or production runs
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Questions? Talk to us directly. Email: sales@globalmetalcasting.com WhatsApp: +86-19577716682 Or simply send your drawing for a free casting feasibility review — we'll respond within 24 hours.
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