The Great Wall SHB-B95T Circulating Water Vacuum Pump

Overview

The Great Wall SHB-B95T Circulating Water Vacuum Pump is an oil-free, water-sealed vacuum system engineered for stable, corrosion-resistant operation in academic, pharmaceutical, and industrial R&D laboratories. It operates on the principle of liquid-ring vacuum generation: rotating water within the pump chamber forms a dynamic seal that compresses and evacuates gas from connected apparatus—enabling continuous vacuum generation without lubricating oils or hydrocarbon contamination. Unlike mechanical or diaphragm pumps, this design eliminates oil backstreaming, making it ideal for solvent-sensitive applications such as rotary evaporation, vacuum filtration, and distillation under reduced pressure. Its 304 stainless steel pump body and fluoropolymer-coated internal components ensure long-term resistance to acidic, alkaline, and organic vapors commonly encountered during extraction, concentration, and purification workflows.

Key Features

• Corrosion-Resistant Construction: 304 stainless steel pump housing and impeller; copper ejectors and suction nozzles with PTFE coating; fluororubber (FKM) motor shaft seals prevent ingress of aggressive vapors into the motor compartment.
• Multi-Port Flexibility: Five independently controllable suction ports with unified vacuum gauge display—supporting simultaneous or sequential vacuum application across multiple instruments (e.g., parallel rotary evaporators or filtration manifolds).
• Integrated Safety & Stability: Built-in check valves prevent backflow of water or condensate into upstream equipment; elevated water tank capacity (57 L) extends operational runtime and thermal stability.
• Mobility & Ergonomics: Equipped with locking casters for repositioning within shared lab spaces; compact vertical footprint (450 × 350 × 820 mm) optimizes bench-to-floor space utilization.
• Thermal Management: Designed for ambient operation between 5–35 °C; periodic water replacement maintains consistent vapor pressure and avoids vacuum decay due to temperature-induced water saturation.

Sample Compatibility & Compliance

The SHB-B95T is compatible with standard laboratory glassware interfaces (e.g., 10/15/19/24 standard taper joints) and supports vacuum levels sufficient for common unit operations including solvent removal (rotary evaporation up to 50 L), vacuum-assisted crystallization, and coarse-to-fine filtration (≥10 L Buchner or Hirsch funnels). As a water-sealed system, it complies with ISO 8573-1:2010 Class 4 purity requirements for non-oil-lubricated vacuum sources and meets general safety provisions outlined in IEC 61010-1 for laboratory electrical equipment. While not intrinsically rated for hazardous area use, its fluororubber seals and stainless-steel wetted parts align with GLP-compliant maintenance protocols requiring traceable material compatibility records.

Software & Data Management

This analog-operated vacuum pump does not incorporate digital controllers or embedded software. All operational parameters—including vacuum level (monitored via single analog gauge), flow distribution, and duty cycle—are manually managed by the user. However, its robust mechanical architecture supports integration into validated systems governed by FDA 21 CFR Part 11 when paired with external data loggers (e.g., calibrated pressure transducers and time-stamped acquisition modules). Maintenance logs—including water replacement intervals, seal inspection dates, and performance verification against baseline ultimate vacuum (≤0.098 MPa)—are recommended for audit readiness in GMP-regulated environments.

Applications

• Vacuum distillation and solvent recovery using 5–50 L rotary evaporators
• Simultaneous vacuum filtration across multi-port manifolds (e.g., parallel sample workup)
• Pressure-controlled drying of heat-sensitive compounds in vacuum ovens
• Gas-phase purging and inert atmosphere preparation prior to air-sensitive reactions
• Support vacuum for double-jacketed reactors (≥10 L volume) during exothermic or reflux processes

FAQ

What is the maximum recommended operating temperature of the circulating water?
Water temperature should be maintained below 25 °C during continuous operation; exceeding 30 °C significantly reduces achievable vacuum due to increased vapor pressure.
Can this pump be used with aggressive solvents like chloroform or THF?
Yes—provided the solvent vapor is condensed upstream (e.g., via cold traps), as the PTFE-coated wetted parts and fluororubber seals provide broad chemical resistance per ASTM D1418 guidelines.
How often should the water be replaced?
For routine daily use, replace water every 8–12 hours; for high-boiling-point solvent applications, replace after each batch to prevent dissolved residue accumulation and vacuum drift.
Is the SHB-B95T suitable for cleanroom environments?
It is not certified for ISO Class 5+ cleanrooms due to open water reservoir design and lack of HEPA filtration, but may be deployed in controlled ambient labs supporting non-sterile synthesis and purification.
Does the pump require calibration?
No formal calibration is required; however, periodic verification of ultimate vacuum (using a traceable digital manometer) and visual inspection of seal integrity are essential for quality assurance compliance.