YUHUA SHZ-D(III) Circulating Water Vacuum Pump

Overview

The YUHUA SHZ-D(III) Circulating Water Vacuum Pump is an engineered solution for reliable, low-maintenance vacuum generation in academic, pharmaceutical, and industrial laboratory environments. Operating on the principle of water-ring vacuum generation, it utilizes a rotating impeller within a partially filled, eccentrically mounted water chamber to create a sealed, variable-volume cavity—generating vacuum through compression and displacement of air. Unlike oil-sealed mechanical pumps, this water-cooled design eliminates hydrocarbon contamination risks, making it ideal for solvent evaporation, rotary evaporation, vacuum filtration, and suction filtration applications where sample purity and operator safety are critical. Its compact footprint (400 × 280 × 420 mm) and lightweight construction (15 kg) address space constraints common in modern teaching labs and QC facilities without compromising performance stability.

Key Features

• Dual independent suction ports with individual vacuum gauges—enabling simultaneous operation of two vacuum-dependent instruments (e.g., one rotary evaporator and one vacuum oven) or differential pressure monitoring across separate lines.
• Corrosion-resistant housing options: high-performance polymer composite for general-purpose use or electropolished 1Cr18 stainless steel for enhanced durability in aggressive chemical environments (e.g., HCl, HNO₃, or organic acid vapors).
• Integrated ice-addition port in the transparent, chemically inert water reservoir—facilitating rapid temperature stabilization during extended vacuum operations to minimize vapor pressure drift and improve condensation efficiency.
• Modular vacuum regulation: optional inline vacuum control valve allows fine-tuned adjustment of suction pressure (0.01–0.098 MPa range), supporting method-sensitive protocols such as gentle solvent removal from thermolabile compounds.
• Low-noise operation (<55 dB(A) at 1 m) achieved via balanced impeller dynamics and vibration-damping mounting—ensuring compatibility with noise-sensitive analytical suites and open-plan lab layouts.

Sample Compatibility & Compliance

The SHZ-D(III) is compatible with aqueous, polar organic, and mildly corrosive solvents (e.g., ethanol, acetone, ethyl acetate, dilute acids/bases) when used with corrosion-resistant wetted materials. It is not intended for use with water-immiscible solvents (e.g., hexane, toluene) or highly oxidizing agents (e.g., concentrated H₂O₂, fuming nitric acid) unless paired with external cold traps and secondary scrubbers. While not certified to ISO 9001 or CE for medical device manufacturing, its construction adheres to GB/T 2828.1 (Chinese national standard for sampling procedures) and supports GLP-compliant workflows when integrated into documented vacuum system SOPs. The dual-gauge configuration enables real-time verification of line integrity—critical for USP environmental monitoring setups requiring vacuum consistency validation.

Software & Data Management

As a standalone analog vacuum source, the SHZ-D(III) does not incorporate embedded firmware or digital connectivity. However, its dual analog vacuum gauges provide immediate visual feedback suitable for manual process logging in paper-based or electronic lab notebooks (ELN). When deployed in regulated environments (e.g., GMP QC labs), users may integrate external pressure transducers (e.g., Validated Honeywell ST3000 series) with data acquisition systems compliant with FDA 21 CFR Part 11 for audit-trail-enabled vacuum parameter recording. The pump’s stable flow rate (60 L/min ±3% under rated load) and repeatable vacuum hold (<0.002 MPa/h decay at 0.095 MPa) support reproducible method transfer between instruments and laboratories.

Applications

• Rotary evaporation of heat-sensitive extracts in natural product isolation workflows.
• Vacuum-assisted filtration of precipitates in inorganic synthesis and catalyst recovery.
• Gas evacuation prior to Schlenk-line manifold purging in air-sensitive organometallic chemistry.
• Suction filtration in pharmaceutical tablet dissolution testing per USP .
• Supporting vacuum desiccators in moisture-content analysis (ASTM D1557, ISO 1183-1).
• Providing primary vacuum for benchtop mass spectrometry sample introduction systems requiring ≤0.1 MPa backing pressure.

FAQ

What is the maximum permissible operating temperature of the circulating water?
The unit is designed for continuous operation with tap water at 5–30 °C; for extended runs >2 hours, maintain inlet water temperature below 25 °C to ensure stable vacuum output and prevent thermal expansion-induced seal stress.
Can this pump be used with a rotary evaporator requiring precise vacuum ramping?
Yes—when equipped with the optional vacuum regulating valve, the SHZ-D(III) supports stepwise pressure reduction (e.g., 0.095 → 0.040 → 0.010 MPa) compatible with multi-stage evaporation protocols.
Is routine maintenance required beyond water replacement?
Monthly inspection of impeller clearance and annual replacement of the silicone rubber shaft seal (part no. YH-SEAL-D3) are recommended to sustain long-term vacuum integrity and flow consistency.
Does the pump meet international electrical safety standards?
It complies with GB 4706.1 (China’s household/medical equipment safety standard), but lacks UL/CSA or IEC 61010-1 certification; external isolation transformers are advised for integration into North American or EU lab power grids.
How does ambient humidity affect performance?
High ambient humidity (>80% RH) may reduce achievable vacuum by up to 5% due to increased water vapor partial pressure in the intake stream—use of a desiccant pre-scrubber is recommended in tropical or monsoon-prone regions.