Shideng SHB-III Benchtop Circulating Water Vacuum Pump

Overview

The Shideng SHB-III Benchtop Circulating Water Vacuum Pump is an oil-free, water-cooled vacuum source engineered for reliable, low-maintenance operation in academic laboratories, R&D centers, and pilot-scale chemical processing environments. It operates on the principle of water-jet aspiration—using a controlled circulating water stream to generate vacuum via the Venturi effect within a precision-machined ejector assembly. Unlike mechanical or diaphragm pumps, this design eliminates lubricants, hydrocarbon contamination, and wear-prone moving parts in the vacuum path, making it ideal for applications requiring chemically inert, dry, and particle-free vacuum conditions. Its closed-loop water circulation system ensures consistent thermal stability during extended operation, while the integrated fluid silencer dampens cavitation-induced noise and suppresses entrained air bubbles—directly enhancing ultimate vacuum performance and operational reproducibility. Designed for integration with rotary evaporators, vacuum filtration manifolds, and cold traps, the SHB-III delivers stable vacuum down to 20 mbar (0.098 MPa) with dual independent suction ports, enabling simultaneous or isolated vacuum control across multiple apparatuses.

Key Features

• Dual independent vacuum inlets with individual analog vacuum gauges—enabling concurrent use with two instruments or selective isolation for pressure-sensitive processes.
• Corrosion-resistant wetted components: pump body and impeller constructed from AISI 304 stainless steel; ejector and suction nozzles available in PP, 304 SS, or copper/PTFE-coated variants per application compatibility requirements.
• Integrated fluid silencer reduces hydraulic noise by >15 dB(A) and minimizes dissolved gas nucleation in the recirculating water, improving vacuum stability and extending service intervals.
• Stainless steel 304 motor shaft sealed with fluorocarbon (FKM) elastomer—providing resistance to water, organic solvents, and mild acids across the 5–35 °C operating range.
• Check valve installed in the gas path prevents backflow of condensate or process liquids into the pump chamber, safeguarding internal components during shutdown or pressure transients.
• Compact benchtop footprint (385 × 280 × 420 mm) and lightweight construction (11 kg) support flexible lab layout and easy repositioning without floor mounting.

Sample Compatibility & Compliance

The SHB-III is compatible with aqueous, polar organic, and moderately aggressive solvent systems commonly encountered in extraction, distillation, and lyophilization workflows. Its water-jet vacuum generation mechanism inherently avoids oil vapor backstreaming, eliminating risk of sample contamination—a critical requirement for GLP-compliant analytical preparation and USP sterile compounding support systems. While not certified to ISO 22870 or IEC 61000-6-3 for EMC immunity, its IP20 enclosure and Class 2 pollution rating align with standard laboratory environmental classifications per IEC 60529 and IEC 60664-1. The unit complies with GB/T 22987–2008 (Chinese national standard for circulating water vacuum pumps) and meets CE-marked safety prerequisites for low-voltage equipment (220 V~, 50 Hz). For regulated environments, audit-ready documentation—including factory calibration records and material traceability for wetted parts—is available upon request.

Software & Data Management

The SHB-III is a standalone analog instrument with no embedded microcontroller or digital interface. Vacuum level monitoring is performed via dual front-panel Bourdon-tube gauges calibrated to ±5% full scale (0–0.1 MPa range). As a utility-grade vacuum source, it does not generate electronic data logs or support USB/RS-232 connectivity. However, its stable output and mechanical simplicity ensure high repeatability across manual protocols, supporting 21 CFR Part 11–aligned paper-based logbook entries when paired with time-stamped procedural records. Optional external digital vacuum sensors (e.g., MKS Baratron series) may be integrated upstream for automated pressure logging in validated systems.

Applications

• Rotary evaporation of heat-sensitive compounds under controlled vacuum (e.g., essential oils, pharmaceutical intermediates).
• Vacuum-assisted filtration of crystalline precipitates or biological suspensions using Buchner funnels or Hirsch filters.
• Short-path distillation and fractional crystallization setups requiring stable sub-atmospheric pressure profiles.
• Deaeration of solvents prior to chromatography mobile phase preparation or electrochemical cell filling.
• Support vacuum for freeze-drying shelves during primary drying phase in small-scale lyophilizers.
• Gas-phase extraction and headspace sampling in environmental and food safety testing labs.

FAQ

What is the maximum continuous duty cycle for the SHB-III?

The pump is rated for intermittent operation up to 8 hours per day at ambient temperatures ≤30 °C. Continuous 24/7 operation is not recommended due to thermal accumulation in the water reservoir; periodic water replacement or external chiller integration is advised for extended runs.
Can the SHB-III be used with corrosive vapors such as HCl or Cl₂?

No—standard configuration is unsuitable for strongly oxidizing or halogenated gases. For such applications, specify the SHB-IIIG variant with copper/PTFE-coated nozzle and PP housing, and verify chemical compatibility using ASTM D543 guidelines.
Is distilled water required for operation?

Deionized or softened water is strongly recommended to prevent scale buildup in the ejector throat and water jacket. Tap water with hardness >150 ppm CaCO₃ requires quarterly descaling with 5% citric acid solution.
How often should the water be changed during routine use?

Under typical 4–6 hour daily use, replace water every 2–3 days. In high-humidity environments or when handling volatile solvents, monitor water temperature rise (>5 °C above ambient) as an indicator for immediate replacement.
Does the SHB-III meet FDA requirements for pharmaceutical lab use?

While the pump itself is not FDA-listed, its oil-free, non-contaminating operation and stainless steel/PP wetted path satisfy core GMP Annex 15 and EU GMP Chapter 3 expectations for ancillary vacuum utilities in non-sterile API synthesis and QC testing environments.