Hebei Heping SHZ-CB Stainless Steel Circulating Water Vacuum Pump

Overview

The Hebei Heping SHZ-CB Stainless Steel Circulating Water Vacuum Pump is an oil-free, water-cooled vacuum generation system engineered for continuous, low-maintenance operation in analytical, synthetic, and preparative laboratory environments. Unlike mechanical or diaphragm vacuum pumps, the SHZ-CB operates on the principle of water ring vacuum generation: a rotating stainless steel impeller eccentrically mounted within a partially water-filled casing creates a dynamic water ring that seals inter-blade chambers and compresses gas during rotation. This mechanism enables stable vacuum development without lubricating oil—eliminating hydrocarbon contamination risks and simplifying maintenance protocols. With an ultimate vacuum of 0.098 MPa (equivalent to ~20 mbar absolute pressure), the SHZ-CB supports common vacuum applications including rotary evaporation, vacuum filtration, vacuum drying ovens, and suction filtration setups. Its integrated 50 L reservoir sustains thermal stability during extended use, while the dual-function design—simultaneously serving as both vacuum source and coolant recirculator—reduces external plumbing complexity and conserves tap water.

Key Features

• Triple independent vacuum ports (3 × 10 L/min nominal pumping speed each), configurable for individual or parallel operation—ideal for multi-station workflows such as simultaneous rotary evaporators or parallel filtration manifolds.
• Corrosion-resistant construction: polypropylene (PP) housing resists organic solvents, acids, and alkalis; internal wetted components—including impeller, distributor, and pump body—are fabricated from AISI 304 stainless steel (1Cr18Ni9) for long-term durability under aggressive chemical exposure.
• Oil-free, closed-loop water circulation system eliminates solvent vapor condensation issues and prevents cross-contamination between experiments—critical for GLP-compliant sample preparation and pharmaceutical QC labs.
• Thermally stabilized operation: built-in 50 L reservoir with overflow protection and level indicator ensures consistent water temperature and flow rate (80 L/min total circulation capacity), minimizing vacuum fluctuation caused by thermal drift.
• Low-noise engineering: optimized impeller geometry and vibration-dampened mounting reduce operational noise to ≤62 dB(A) at 1 m distance—suitable for shared lab spaces and ISO 14644-classified cleanroom-adjacent environments.
• Energy-efficient 370 W induction motor with thermal overload protection, rated for continuous duty at 220 V / 50 Hz—meets IEC 60034-1 efficiency class IE2 standards.

Sample Compatibility & Compliance

The SHZ-CB is compatible with standard ground-glass jointed glassware (e.g., B-24, B-29, NS 29/32), Buchner funnels, Hirsch funnels, and rotary evaporator condensers. Its solvent-resistant PP housing and stainless steel internals support exposure to aqueous solutions, ethanol, acetone, ethyl acetate, dichloromethane, and dilute mineral acids (≤10% HCl, ≤5% HNO₃). It is not recommended for use with strong oxidizers (e.g., concentrated HNO₃, perchloric acid) or halogenated solvents above 60 °C due to potential polymer degradation. While not certified to UL/CSA or CE for medical device use, the pump complies with general-purpose electrical safety requirements per GB 4706.1–2005 (Chinese national equivalent of IEC 60335-1). Its oil-free architecture inherently satisfies ISO 8573-1 Class 0 air purity requirements for vacuum lines feeding sensitive instrumentation.

Software & Data Management

The SHZ-CB is a standalone analog-operated instrument with no embedded microcontroller, firmware, or digital interface. It features a manual on/off switch and three independent vacuum port valves with calibrated needle-type flow control. As a non-networked, non-data-logging device, it requires no software installation, driver configuration, or cybersecurity validation. This design ensures deterministic behavior, zero firmware-related failure modes, and full compatibility with legacy laboratory infrastructure—including older vacuum manifolds and analog pressure gauges. For laboratories operating under FDA 21 CFR Part 11 or EU Annex 11, the absence of electronic records means no audit trail, electronic signature, or data integrity controls are required—reducing validation burden in regulated QC/QA settings where vacuum is a utility rather than a critical process parameter.

Applications

• Rotary evaporation of heat-sensitive compounds under reduced pressure (e.g., natural product isolation, polymer synthesis workups).
• Vacuum-assisted gravity filtration using sintered glass or membrane filters for particulate removal in environmental water analysis (EPA Method 160.1) or pharmaceutical suspension clarification.
• Desiccation of hygroscopic solids in vacuum desiccators equipped with P₂O₅ or silica gel.
• Gas sampling and trapping via vacuum-driven bubblers or impingers in air quality monitoring (NIOSH Method 0500).
• Supporting vacuum distillation columns and short-path distillation systems requiring stable sub-atmospheric pressure control.
• Integration into custom-built reaction manifolds for Schlenk-line–style inert atmosphere manipulation when paired with appropriate gas regulators and shut-off valves.

FAQ

What is the maximum allowable water temperature for continuous operation?
The unit is designed for inlet water temperatures between 5 °C and 30 °C. Sustained operation above 35 °C may reduce vacuum stability and accelerate PP housing aging. Use of a chiller or recirculating cooler is recommended for ambient temperatures >32 °C.
Can the SHZ-CB be used with volatile organic solvents in the vacuum line?
Yes—provided vapors are fully condensed upstream (e.g., via dry ice/acetone cold traps or coil condensers). Uncondensed solvent vapors may saturate the water reservoir and reduce vacuum performance over time; periodic water replacement is advised after extended organic solvent use.
Is the pump suitable for vacuum oven applications requiring deep vacuum?
No—the SHZ-CB achieves 0.098 MPa (~20 mbar), which is sufficient for most drying applications but insufficient for high-vacuum ovens (<1 mbar) requiring diffusion or turbomolecular pumping stages.
How often should the circulating water be replaced?
Under normal aqueous use, replace water every 3–5 days. When handling organics or salts, inspect reservoir clarity daily and replace immediately if discoloration, cloudiness, or precipitate formation occurs.
Does the pump require regular lubrication or filter changes?
No—being oil-free and filterless, routine maintenance is limited to visual inspection of water level, hose integrity, and port valve function. Annual impeller clearance check (per manufacturer’s service manual) is recommended for labs operating >2000 hr/year.