Great Wall SHB-IIIS Desktop Circulating Water Vacuum Pump

Overview

The Great Wall SHB-IIIS Desktop Circulating Water Vacuum Pump is an oil-free, water-sealed vacuum source engineered for precision laboratory applications requiring stable, low-maintenance negative pressure generation. It operates on the principle of water-ring vacuum generation: rotating water within the pump chamber forms a liquid seal that traps and evacuates gas from connected apparatuses via centrifugal action. Unlike mechanical or diaphragm pumps, this design eliminates lubricant contamination risks and ensures compatibility with solvent-laden vapors commonly encountered in rotary evaporation, distillation, filtration, and vacuum drying workflows. Its compact footprint (385 × 280 × 420 mm) and 9.5 kg mass enable seamless integration onto standard lab benches or mobile carts. With a maximum attainable vacuum of 0.098 MPa (equivalent to 20 mbar absolute pressure), the SHB-IIIS delivers sufficient suction for most bench-scale separation processes while maintaining thermal stability across ambient conditions ranging from 5 °C to 35 °C.

Key Features

• Double independent vacuum ports with dual analog pressure gauges—enabling simultaneous operation of two instruments or parallel evacuation of separate reaction vessels.
• Integrated fluid silencer reduces cavitation noise by minimizing dissolved gas release and interfacial turbulence between water and entrained vapor, achieving significantly lower operational sound levels compared to conventional circulating water pumps.
• 304 stainless steel motor shaft and fluororubber shaft seal ensure long-term corrosion resistance against aqueous and mildly aggressive chemical environments.
• Check valves installed in internal gas pathways prevent backflow of condensate or cooling water into vacuum lines—a critical safeguard during shutdown or system pressure equalization.
• Modular component construction allows material customization: pump body, impeller, ejector, and inlet nozzles are available in 304 stainless steel, polypropylene (PP), polyamide (PA), or copper/PTFE-coated variants to match specific chemical compatibility requirements per ASTM D543 and ISO 15142 standards.
• Self-contained 15 L polypropylene water reservoir with level indicator supports extended unattended operation; water is recirculated at 7 L/min with a lift head of 10 m, minimizing resource consumption and eliminating continuous tap-water dependency.

Sample Compatibility & Compliance

The SHB-IIIS is compatible with glassware systems including rotary evaporators, cold traps, vacuum desiccators, and Buchner funnels. Its water-sealed architecture inherently avoids hydrocarbon or silicone oil contamination—making it suitable for pharmaceutical process development where USP extractables profiling and ICH Q5C purity assessments apply. While not certified to UL/CSA or CE for standalone safety compliance, its IP20 enclosure and Class 2 pollution degree align with general-purpose laboratory installation per IEC 61010-1:2010. Users performing GLP or GMP-regulated work should validate system performance—including ultimate vacuum stability, flow repeatability, and temperature drift—against internal SOPs prior to use in quality-critical stages.

Software & Data Management

This model operates as a standalone analog device without digital control interfaces or embedded firmware. All operational parameters—including vacuum level, runtime, and water temperature—are monitored manually via dual front-panel gauges and visual tank inspection. For laboratories requiring audit-ready records, integration with external data loggers (e.g., Omega OM-DAQPRO-5300 series) is supported through optional 4–20 mA pressure transducer outputs (available upon request). No proprietary software is required, and no data storage or electronic signature functionality is provided—consistent with FDA 21 CFR Part 11 exemptions for non-record-keeping auxiliary equipment.

Applications

• Routine solvent removal via rotary evaporation under controlled vacuum (e.g., ethanol, acetone, ethyl acetate).
• Vacuum-assisted gravity or pressure filtration of crystalline precipitates or biological suspensions.
• Distillation setups requiring gradual pressure ramping and stable sub-atmospheric conditions.
• Gas-phase sampling systems where oil-free vacuum prevents adsorption artifacts in GC or FTIR sample introduction lines.
• Teaching laboratories emphasizing principles of fluid dynamics, thermodynamic phase behavior, and vacuum physics due to transparent operational mechanics and direct parameter observability.

FAQ

Is the SHB-IIIS suitable for use with corrosive solvents such as concentrated HCl or nitric acid vapors?
No—standard configuration uses PP and 304 stainless steel components rated for mild organics and dilute aqueous solutions only. For halogenated or strong oxidizing vapors, specify the SHB-IIIG variant with copper/PTFE-coated nozzles and confirm material compatibility using NACE MR0175/ISO 15156 guidelines.
Can the water reservoir be refilled during operation?
Yes—top-up is possible via the dedicated fill port without interrupting vacuum generation, though users must maintain minimum water level above the impeller to prevent dry-running damage.
Does the pump require periodic oil changes?
No—it is a completely oil-free, water-sealed design; routine maintenance consists solely of water replacement, tank cleaning, and visual inspection of seals and check valves every 200 operating hours.
What is the expected service life under continuous 8-hour daily use?
With proper water quality management (deionized or distilled water recommended) and ambient temperature control, the motor and wetted components demonstrate ≥15,000 hours MTBF based on manufacturer accelerated life testing per ISO 13849-1.