The Great Wall SHB-IV Dual-A Double-Sided Circulating Water Vacuum Pump

Overview

The Great Wall SHB-IV Dual-A is an oil-free, circulating water vacuum pump engineered for stable, low-maintenance vacuum generation in academic, pharmaceutical, and industrial laboratory environments. Unlike mechanical or diaphragm vacuum pumps, it operates on the principle of water-ring vacuum generation: a rotating impeller creates a liquid ring inside the pump chamber, forming sealed cavities that expand to draw in gas and contract to expel it—enabling continuous vacuum production without lubricating oils or hydrocarbon contamination. This design ensures intrinsic chemical compatibility with acidic, alkaline, and organic vapors commonly encountered during rotary evaporation, vacuum filtration, distillation, and degassing procedures. Its dual-sided configuration supports symmetrical water circulation and balanced thermal load distribution, enhancing long-term operational stability under continuous duty cycles.

Key Features

• Four independently isolated vacuum ports, each equipped with a calibrated analog vacuum gauge for real-time, localized pressure monitoring—ideal for multi-station setups such as parallel rotary evaporators or manifold-based filtration systems.
• Integrated acoustic fluid silencer reduces turbulence-induced noise by dampening gas–liquid shear at the inlet stage, achieving typical sound pressure levels below 55 dB(A) under full-load operation.
• Corrosion-resistant wetted components: stainless steel impeller and housing interface, combined with PP (polypropylene) reservoir and tubing connections—ensuring reliable performance when handling mildly aggressive solvents, HCl fumes, or basic aqueous solutions.
• Automatic anti-siphon protection via precision-engineered check valves prevents backflow of coolant into connected apparatus upon shutdown—a critical safeguard for condenser integrity and sample containment.
• Energy-efficient 250 W induction motor delivers consistent torque across voltage fluctuations (220–240 V, 50 Hz), rated for >10,000 hours MTBF under standard laboratory ambient conditions (15–30 °C, <70% RH).

Sample Compatibility & Compliance

The SHB-IV Dual-A is compatible with glassware assemblies conforming to ISO 3585 (borosilicate 3.3) and ASTM E438 Type I Class A specifications. Its oil-free operation eliminates risk of downstream contamination—making it suitable for applications governed by USP Analytical Instrument Qualification and aligned with GLP-compliant vacuum-dependent workflows. While not certified to IEC 61000-6-3 (EMC) or UL 61010-1 out-of-the-box, its electrical architecture complies with GB 4793.1–2007 (Chinese national standard equivalent to IEC 61010-1), and all plastic components meet RoHS Directive 2011/65/EU material restrictions. Users performing regulated work are advised to implement periodic verification of ultimate vacuum (e.g., using a traceable digital manometer per ISO 2533) and log coolant replacement intervals per internal SOPs.

Software & Data Management

This model operates as a standalone analog instrument with no embedded microcontroller or digital interface. Vacuum level observation relies exclusively on four front-panel analog gauges (0–0.1 MPa scale, ±1.5% FS accuracy). For integration into automated lab environments, optional external pressure transducers (e.g., Honeywell ASDX series) may be installed downstream of individual ports and interfaced via RS-485 or 4–20 mA loops to SCADA or LIMS platforms. Audit trails for maintenance—including water change logs, motor current readings, and vacuum decay tests—must be manually recorded per institutional GLP/GMP documentation requirements.

Applications

• Routine solvent removal via rotary evaporation (R-210/R-300 series rotovaps)
• Vacuum-assisted gravity and pressure filtration (Büchner and Hirsch funnels)
• Short-path and fractional distillation under reduced pressure
• Lyophilizer pre-freezing and primary drying support (as auxiliary vacuum source)
• Gas-phase extraction and inert atmosphere purging in Schlenk line configurations
• Teaching labs requiring demonstrable vacuum principles without oil-handling hazards

FAQ

What is the recommended coolant replacement interval?
Under continuous operation at ambient temperatures ≤25 °C, replace the PP reservoir water every 48–72 hours; increase frequency to every 24 hours if pumping warm or volatile solvents generating significant vapor load.
Can this pump handle acetone or ethyl acetate vapors?
Yes—provided condensation traps are installed upstream and coolant temperature remains below 15 °C to minimize vapor saturation; prolonged exposure to high-concentration chlorinated solvents is not advised due to potential PP swelling.
Is the 0.0947–0.098 MPa ultimate vacuum value achievable at all ambient temperatures?
No—this specification assumes circulating water temperature between 6–25 °C; vacuum degrades approximately 1.2 kPa per 1 °C rise above 25 °C due to increased water vapor pressure.
Does the pump include overload protection?
Yes—an integrated thermal cutout interrupts power to the motor if winding temperature exceeds 130 °C, resetting automatically after cooldown.
Are spare parts such as impellers or seals available separately?
Yes—The Great Wall supplies OEM-certified stainless steel impellers (P/N: SHB-IV-IMP-SS), PP gasket kits (P/N: SHB-GSK-PP), and acoustic silencer assemblies (P/N: SHB-SIL-FLUID) through authorized international distributors.