Ⅰ. Product Introduction
A gas sampling valve is a precision fluid control component designed for accurate, repeatable extraction and transfer of gas samples in analytical, industrial, and research scenarios. It serves as a core link between gas sources (e.g., industrial pipelines, environmental monitoring points, reaction chambers) and analytical instruments (e.g., gas chromatographs, mass spectrometers, infrared analyzers). By controlling the on/off and flow path switching of the valve core, it ensures that the gas sample is captured without contamination, dilution, or component loss, laying the foundation for reliable analytical results. It is widely used in petrochemical, environmental protection, food safety, pharmaceutical, and semiconductor industries.
Ⅱ. Product Features
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High Sampling Precision & RepeatabilityAdopts precision-machined valve core (e.g., ceramic, PTFE) and sealing structure, with sampling volume error ≤±0.5% and repeatability error ≤±0.2%. It avoids sample loss caused by internal dead volume, ensuring consistent results in batch sampling.
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Excellent Corrosion ResistanceValve body materials include 316L stainless steel (for general corrosive gases), Hastelloy (for strong acids/bases), and PTFE-lined materials (for ultra-corrosive media like chlorine, sulfur dioxide). Suitable for sampling of aggressive or high-purity gases without material degradation.
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Low Dead Volume DesignInternal flow path is optimized to minimize dead volume (≤0.1mL for small-size models), preventing cross-contamination between consecutive samples. Critical for trace gas analysis (e.g., ppb-level environmental pollutant detection).
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Wide Operating Condition Adaptability
- Temperature range: -40℃~200℃ (standard models); up to 400℃ for high-temperature customized versions.
- Pressure range: Vacuum (-0.1MPa) to high pressure (30MPa), compatible with low-pressure environmental sampling and high-pressure pipeline monitoring.
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Reliable Sealing PerformanceUses spring-loaded sealing rings or metal-to-metal sealing (for high-temperature/pressure), with leak rate ≤1×10⁻⁹ Pa·m³/s. Ensures no sample leakage or air ingress during sampling.
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Easy Integration & OperationSupports manual (handwheel) or automatic (pneumatic/electric) control; equipped with standard interfaces (e.g., 1/4″ VCR, Swagelok) for quick connection to instruments/pipelines. Automatic models can be linked to PLC systems for unattended continuous sampling.
Ⅲ. Technical Data
| Parameter | Specification (Standard Model) | Customizable Range |
|---|---|---|
| Sampling Volume | 0.5mL, 1mL, 5mL, 10mL | 0.1mL~100mL |
| Valve Body Material | 316L Stainless Steel | Hastelloy C-276, PTFE-lined, Monel |
| Valve Core Material | Ceramic (Al₂O₃) / PTFE | Zirconia, PEEK |
| Operating Pressure | -0.1MPa ~ 10MPa | -0.1MPa ~ 30MPa |
| Operating Temperature | -20℃ ~ 150℃ | -40℃ ~ 400℃ |
| Sampling Precision | ≤±0.5% | ≤±0.1% (high-precision version) |
| Repeatability | ≤±0.2% | ≤±0.05% (high-precision version) |
| Leak Rate | ≤1×10⁻⁹ Pa·m³/s (He test) | ≤1×10⁻¹¹ Pa·m³/s (ultra-low leak) |
| Control Mode | Manual (handwheel) / Pneumatic | Electric (stepper motor), PLC-linked |
| Connection Interface | 1/4″ Swagelok, 1/8″ VCR | Custom threads (NPT, BSPT) |
| Service Life | ≥100,000 cycles (standard use) | ≥500,000 cycles (heavy-duty version) |
