Porter Pressure Regulator Valve for Thermo LCQ Duo

Porter EPC-1020 Electronic Proportional Pressure Control Valve

The Porter EPC-1020 is a high-precision, electromagnetically actuated proportional control valve specifically designed for closed-loop gas pressure regulation in analytical instrumentation. Within the Thermo Finnigan LCQ Duo and LCQ Advantage mass spectrometry systems, this valve (often designated under part number DEMB3628028) manages the precise delivery of nitrogen sheath and auxiliary gases. By utilizing DC-driven proportional actuation, the EPC-1020 ensures a steady, pulse-free gas flow, which is fundamental to maintaining stable spray conditions and reproducible ionization in the Atmospheric Pressure Ionization (API) source.

Technical Performance and Design

• Proportional Control Precision: Features a DC-driven, normally closed architecture that allows for infinitely variable valve positioning, providing a dynamic range greater than 50:1 for ultra-fine pressure adjustments.

• Analytical Grade Cleaning: Specifically cleaned and validated for use in mass spectrometry and chromatography environments, ensuring no outgassing or particulate contamination enters the sensitive gas pathways.

• Bubble-Tight Shut-Off: Equipped with a high-durability elastomeric valve seat (typically Viton® or Kalrez®) to provide a reliable seal when the system is in standby, preventing gas waste and pressure drift.

• Low Power Dissipation: Engineered for high-efficiency operation (typically 0.8W), minimizing thermal transfer to the surrounding gas manifold and ensuring consistent gas density.

Product Specifications

• Catalog Number: EPC-1020

• Thermo Part Number Reference: DEMB3628028 (Valve Assembly)

• Valve Type: Electronic Proportional Control (EPC)

• Operating Pressure: Up to 200 PSIG

• Flow Capacity: Optimized for nitrogen nebulizing gas (Up to 10,000 SCCM depending on orifice configuration).

• Connection Interface: Standard 1/8" or 1/16" compression fittings (System dependent).

Key Benefits & Maintenance Applications

• Ionization Stability: The primary component for resolving "Fluctuating Sheath Gas" errors or erratic source pressure readouts that cause signal instability during ESI/APCI runs.

• Source Tuning Recovery: Essential for correcting issues where the instrument fails to reach the set gas flow units (e.g., Sheath Gas 80 units) during method initialization.

• Modular Manifold Repair: Designed for straightforward integration into the LCQ’s gas control manifold, allowing for the rapid replacement of sticking or leaking valves without full manifold overhauls.

• High Chemical Resilience: Constructed with black-anodized aluminum or stainless steel wetted parts to ensure long-term compatibility with industrial-grade nitrogen and auxiliary gas types.

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Removed from a working machine, in excellent condition.