The Great Wall SHB-B95 Series Circulating Water Vacuum Pump

Overview

The Great Wall SHB-B95 Series Circulating Water Vacuum Pump is an oil-free, water-sealed vacuum generation system engineered for stable, low-maintenance operation in academic laboratories, pharmaceutical QC environments, and chemical synthesis workflows. It operates on the principle of liquid-ring vacuum generation: rotating water within the pump chamber forms a dynamic seal and compresses entrained gas, enabling continuous evacuation without lubricating oil or mechanical contact between moving parts. This design eliminates hydrocarbon contamination risks—critical for solvent-sensitive applications such as rotary evaporation, vacuum filtration, and vacuum drying—and ensures compliance with GLP-aligned laboratory practices where trace organic residue must be avoided. Unlike dry scroll or diaphragm pumps, the SHB-B95 leverages thermally stable water circulation to sustain consistent vacuum levels under variable load conditions, provided coolant temperature remains within specification (≤30 °C). Its 5-port manifold architecture supports simultaneous multi-vessel evacuation while maintaining independent pressure control per port via individual stopcocks.

Key Features

• Five independently controllable suction ports with single analog vacuum gauge—enabling flexible configuration for parallel or sequential vacuum tasks
• Corrosion-resistant wetted components: 304 stainless steel pump body and impeller; copper or PTFE-coated ejectors and check valves; polypropylene (PP) or fluororubber (FKM)-lined gas pathways
• Hermetically sealed motor assembly: 304 stainless steel shaft paired with FKM elastomer O-rings prevents ingress of corrosive vapors (e.g., HCl, SO₂, organic solvents) into the motor housing
• Integrated non-return (check) valves in all gas lines to prevent backflow of water or condensate during power interruption or shutdown
• Large-capacity 57 L polyethylene (PE) water reservoir with thermal mass sufficient for extended operation at ambient temperatures up to 35 °C
• Mobile base with industrial-grade casters and locking brakes—facilitates repositioning across benchtop, fume hood, or central utility zones
• IP20-rated enclosure suitable for indoor laboratory environments with controlled humidity (≤70% RH) and no direct water exposure

Sample Compatibility & Compliance

The SHB-B95 series is compatible with standard laboratory glassware (e.g., Büchner funnels, evaporating flasks, Schlenk lines) and interfaces seamlessly with common vacuum-requiring instruments including rotary evaporators (e.g., Heidolph, IKA), vacuum ovens (e.g., Memmert), and filtration manifolds. Its water-mediated vacuum generation inherently excludes particulate or oil carryover, making it suitable for ISO 8573-1 Class 4 compressed air–equivalent cleanliness requirements in non-critical vacuum applications. While not certified to specific ISO/IEC 17025 or FDA 21 CFR Part 11 standards as a standalone device, its construction materials (304 SS, FKM, PE, PP) meet USP Class VI biocompatibility thresholds for incidental contact with pharmaceutical intermediates. Operation adheres to IEC 61000-6-3 (EMC emission limits) and IEC 61000-6-2 (immunity) for laboratory equipment. Users are advised to monitor reservoir water conductivity (<500 µS/cm) and replace water every 24–48 h under continuous use to maintain specified ultimate pressure (0.098 MPa).

Software & Data Management

The SHB-B95 is a manually operated, analog-control vacuum pump with no embedded microprocessor, digital interface, or data logging capability. Vacuum level is monitored exclusively via a calibrated Bourdon-tube analog gauge (0–0.1 MPa scale). As such, it does not generate electronic records, require firmware updates, or support network connectivity. This architecture aligns with laboratories operating under simplified quality systems (e.g., ISO 9001, basic GLP) where audit trails are maintained manually via logbooks. For environments requiring electronic data capture, integration with external pressure transducers (e.g., Validyne DP15, Omega PX409) and SCADA-compatible DAQ systems is feasible via the pump’s mechanical vacuum output port.

Applications

• Vacuum-assisted rotary evaporation of heat-labile compounds in synthetic organic chemistry
• Multi-point vacuum filtration of crystalline APIs under inert atmosphere conditions
• Evacuation of desiccators and vacuum drying ovens for moisture-sensitive hygroscopic materials
• Supporting vacuum distillation setups with fractional condensers and cold traps
• Gas sampling and purging in analytical sample preparation (e.g., headspace vial conditioning)
• Low-vacuum degassing of polymer precursors and coating formulations prior to casting

FAQ

What is the recommended water replacement interval for optimal vacuum performance?
Under continuous operation at ambient temperatures ≤25 °C, replace reservoir water every 48 hours; at 30–35 °C, replace every 24 hours or monitor water temperature rise exceeding 5 °C above inlet temperature.
Can the SHB-B95 be used with aggressive solvents such as acetone or chloroform?
Yes—provided wetted components match the selected variant (e.g., SHB-B95T with PTFE-coated ejectors and FKM seals); however, solvent-saturated water must be disposed of per local hazardous waste regulations.
Is external cooling required for sustained operation?
Not mandatory, but recommended when ambient temperature exceeds 30 °C or when pumping high-vapor-pressure solvents; auxiliary chillers (e.g., 10–15 °C supply) improve ultimate vacuum stability.
How does ambient humidity affect pump performance?
Relative humidity >70% may accelerate corrosion of non-stainless external surfaces and promote condensation in unheated gas lines—housing should remain in climate-controlled lab spaces.
Does the pump comply with RoHS or REACH directives?
Yes—the Great Wall SHB-B95 series conforms to EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with full material declarations available upon request from technical support.