YUHUA SHZ-95B Dual-Head Circulating Water Vacuum Pump

Overview

The YUHUA SHZ-95B is a dual-head circulating water vacuum pump engineered for reliable, oil-free vacuum generation in chemistry, biochemistry, and analytical laboratories. Unlike mechanical or diaphragm vacuum systems, this pump operates on the principle of water-ring vacuum generation—where rotating water within a sealed chamber creates negative pressure through centrifugal displacement and vapor-phase equilibrium. The SHZ-95B maintains stable suction under continuous operation by recirculating deaerated cooling water, eliminating the need for tap-water discharge and minimizing environmental impact. Its design targets space-constrained benchtop environments while preserving performance integrity: it achieves a maximum vacuum level of −0.098 MPa (equivalent to −735 mmHg), suitable for routine applications such as rotary evaporation, vacuum filtration, vacuum drying ovens, and gas aspiration in distillation setups. As an oil-free system, it ensures sample purity—critical for solvent-sensitive syntheses, pharmaceutical intermediate handling, and trace-level analytical workflows where hydrocarbon contamination must be avoided.

Key Features

• Dual independent suction ports with individual vacuum gauges—enables simultaneous operation of two instruments (e.g., one rotary evaporator and one filtration manifold) without cross-pressure interference.
• Corrosion-resistant composite housing and sealed stainless-steel impeller assembly—resists degradation from organic solvents (e.g., acetone, chloroform, ethyl acetate), acidic vapors, and aqueous condensates.
• Integrated 50 L transparent water reservoir with calibrated level indicator and dedicated ice-inlet port—facilitates rapid thermal stabilization during high-load evaporation or low-boiling-point solvent recovery.
• Modular vacuum regulation: optional vacuum control valve allows fine-tuned pressure adjustment between 0.01–0.098 MPa absolute, supporting gradient vacuum protocols required in fractional crystallization or controlled degassing.
• Benchtop-optimized footprint (450 × 340 × 870 mm) and ergonomic handle—designed for mobility across shared lab spaces without compromising structural rigidity or vibration damping.
• 370 W induction motor with thermal overload protection—engineered for continuous 8–12 hour operation at rated flow (10 L/min per port), validated per GB/T 26571–2011 endurance testing protocols.

Sample Compatibility & Compliance

The SHZ-95B is compatible with standard laboratory glassware interfaces (e.g., 10/15/19/24 standard taper joints) and supports vacuum-rated tubing (ID 6–10 mm). It meets national safety and performance benchmarks outlined in GB/T 26571–2011 for general-purpose laboratory vacuum equipment. While not certified to IEC 61000-6-3 (EMC) or UL 61010-1 out-of-the-box, its electrical architecture conforms to Class I protection requirements, including grounded chassis, reinforced insulation, and IP20-rated enclosure. For GLP/GMP-aligned labs, the pump’s consistent vacuum output and absence of lubricant migration support audit-ready documentation of process parameters—particularly when paired with external digital vacuum loggers compliant with FDA 21 CFR Part 11 data integrity requirements.

Software & Data Management

The SHZ-95B operates as a standalone analog instrument with no embedded microcontroller or digital interface. Vacuum monitoring relies on dual analog Bourdon-tube gauges (0–0.1 MPa scale, ±1.6% FS accuracy), ensuring electromagnetic immunity in NMR or mass spectrometry proximity zones. For laboratories requiring traceable vacuum records, third-party pressure transducers (e.g., Validyne DP15 or MKS Baratron series) can be installed inline with the suction ports and interfaced via USB/RS-485 to LIMS or ELN platforms. No proprietary firmware or vendor-specific drivers are required—data acquisition follows standard Modbus RTU or ASCII protocol conventions.

Applications

• Routine rotary evaporation of heat-labile compounds (e.g., natural product isolates, polymer precursors) under controlled sub-atmospheric conditions.
• Vacuum-assisted gravity filtration of fine particulates (e.g., catalyst residues, precipitated metal hydroxides) using Buchner or Hirsch funnels.
• Desiccation of hygroscopic reagents in vacuum desiccators equipped with phosphorus pentoxide or silica gel.
• Supporting vacuum-jacketed condensers in short-path distillation and Kugelrohr apparatuses.
• Gas scavenging in Schlenk line pre-evacuation cycles—when used in tandem with inert gas manifolds.

FAQ

Is the SHZ-95B suitable for use with aggressive solvents such as concentrated HCl or nitric acid vapors?
Yes—its corrosion-resistant shell and sealed impeller prevent direct exposure of metallic components to vapors; however, prolonged use with strong oxidizers requires periodic inspection of the water reservoir seals and gauge diaphragms.
Can the pump operate continuously for 24 hours?
It is rated for uninterrupted 12-hour operation under nominal load; extended runtime beyond this requires scheduled 30-minute cooldown intervals to maintain thermal stability of the motor windings.
Does the unit include a built-in water chiller?
No—the SHZ-95B relies on ambient or ice-enhanced water circulation; integration with external recirculating chillers (e.g., Huber Ministat) is possible via inlet/outlet adapters.
What maintenance intervals are recommended?
Water reservoir cleaning every 48 operating hours, impeller inspection every 500 hours, and gauge calibration annually—or per ISO/IEC 17025 accredited metrology schedules.
Is the vacuum level adjustable without the optional regulating valve?
No—base configuration provides fixed suction; precise pressure modulation requires installation of the factory-available vacuum control valve kit (Part No. VV-SHZ95B).