HKM ZKB-2A Oil-Free Piston Vacuum Pump

Overview

The HKM ZKB-2A Oil-Free Piston Vacuum Pump is a precision-engineered positive displacement vacuum source designed for clean, reliable, and maintenance-optimized operation in laboratory, analytical, and light industrial environments. Utilizing a reciprocating piston mechanism with non-lubricated cylinder walls and self-lubricating polymer seals, it achieves vacuum generation without oil contamination—eliminating vapor backstreaming, hydrocarbon residue, or condensable byproducts. Its operational principle follows classical volumetric displacement: during the suction stroke, the piston retracts to expand the cylinder volume, reducing internal pressure below ambient and opening the inlet check valve; during the compression stroke, the piston advances, increasing pressure and forcing gas out through the outlet check valve. This dual-stroke cycle delivers consistent flow and stable ultimate vacuum performance up to −98.6 kPa (equivalent to −700 mmHg), making it suitable for applications requiring moderate vacuum levels with strict cleanliness requirements.

Key Features

• Oil-free operation ensures zero hydrocarbon contamination—critical for sensitive analytical instrumentation, vacuum drying ovens, degassing systems, and sample preparation workflows where residual oil vapors would compromise data integrity or regulatory compliance.
• Acoustically optimized mechanical design achieves ≤56 dB(A) sound pressure level at 1 m distance, enabling quiet integration into shared lab spaces, QA/QC rooms, and automated benchtop platforms without acoustic shielding.
• Robust construction features hardened cylinder bores and wear-resistant piston rings made from engineered PTFE-composite materials, delivering extended service life under continuous duty cycles and minimizing scheduled maintenance intervals.
• Compact footprint (244 × 125 × 182 mm) and lightweight chassis (8.4 kg) support flexible placement on fume hoods, instrument racks, or mobile carts—ideal for space-constrained laboratories and modular system integration.
• Stable power input (220 V ±10%, 50 Hz) ensures compatibility with standard laboratory mains infrastructure across China and other 220–240 V / 50 Hz national grids without external voltage regulation.

Sample Compatibility & Compliance

The ZKB-2A is compatible with a broad range of vacuum-dependent equipment, including but not limited to rotary evaporators (with cold traps), vacuum filtration manifolds, desiccators, vacuum ovens, gas sampling systems, and semiconductor wafer handling modules. As an oil-free vacuum source, it meets fundamental requirements for ISO 8573-1 Class 0 compressed air purity when used as a vacuum exhaust stage, and supports GLP/GMP-aligned workflows where trace organic contamination must be excluded from process gases. While not certified to specific IEC/EN safety standards out-of-the-box, its electrical architecture complies with general-purpose low-voltage equipment safety principles applicable to Class I appliances in controlled laboratory settings. Users deploying this pump in regulated pharmaceutical or medical device manufacturing contexts should validate its integration per internal SOPs and relevant clauses of ISO 13485 or FDA 21 CFR Part 11—particularly concerning audit-trail-capable system logs if interfaced with supervisory control software.

Software & Data Management

The ZKB-2A operates as a standalone analog device with no embedded microcontroller, firmware, or digital communication interface (e.g., RS-232, USB, or Ethernet). It does not generate telemetry, store operational history, or support remote monitoring. For laboratories requiring data capture or automated control, external pressure transducers (e.g., capacitance manometers calibrated to 0–100 kPa absolute) and programmable logic controllers (PLCs) or LabVIEW-based acquisition systems may be integrated upstream to log vacuum level, runtime, or fault events. Such configurations enable alignment with electronic recordkeeping practices required under 21 CFR Part 11 when paired with appropriate validation documentation and user access controls.

Applications

• Evaporation and concentration of heat-sensitive solvents in rotary evaporation systems where oil-free vacuum prevents cross-contamination between batches.
• Vacuum-assisted filtration of biological suspensions, cell culture media, or nanoparticle dispersions where particulate or organic residue from oil-lubricated pumps could interfere with downstream analysis.
• Pre-conditioning of samples prior to XRD, SEM, or TGA analysis—ensuring surface integrity remains uncompromised by hydrocarbon adsorption.
• Actuation of pneumatic valves and vacuum grippers in automated liquid handling workstations and analytical robotics.
• Environmental air sampling calibration setups requiring stable, particle-free vacuum reference conditions compliant with EPA Method TO-15 or ISO 16000-6 protocols.

FAQ

What is the ultimate vacuum level achievable with the ZKB-2A?

The pump reaches a maximum vacuum of −98.6 kPa (−700 mmHg) under standard atmospheric conditions (25 °C, 101.3 kPa ambient pressure). Actual performance may vary slightly depending on ambient temperature, altitude, and system conductance.
Can this pump be used continuously for extended periods?

Yes—it is rated for intermittent and continuous operation within its thermal design envelope. For optimal longevity, ensure adequate ventilation around the motor housing and avoid operation in ambient temperatures exceeding 40 °C.
Is the ZKB-2A compatible with corrosive or solvent-laden gases?

No. The pump is constructed for clean, dry, non-corrosive gases only. Exposure to halogenated solvents, strong acids, alkalis, or condensable vapors will degrade seal materials and compromise performance and safety.
Does the pump require routine oil changes or lubrication?

No. It is fully oil-free and maintenance-free with respect to lubricants. Periodic inspection of intake filters and check valves is recommended per manufacturer guidelines every 500 operating hours.
What safety certifications does the ZKB-2A hold?

The unit complies with basic electrical safety expectations for Class I laboratory equipment but does not carry CE, UL, or CCC certification. End users are responsible for verifying local regulatory acceptance prior to deployment in certified facilities.