Siemens Maxum II Veriflow Air-Actuated Valve 1671004-103

Overview: Reliable Sample Isolation for Process Gas Chromatography

The Siemens Maxum II Veriflow Air-Actuated Valve, part number 1671004-103, is a pneumatic diaphragm valve rated to 3.77 bar (40 psig), used within the Siemens Maxum Edition II process gas chromatograph as a sample shut-off valve. Diaphragm valve technology is widely used in process analyzer sampling systems because it isolates the actuating mechanism from the process fluid entirely, minimizing dead volume and contamination risk in the sample path that feeds the analyzer’s separation columns and detectors.

As an independent specialized supplier of Siemens Maxum Edition II analyzer spare parts, Seven Star LLC sources and supplies the Veriflow valve 1671004-103 to refineries, gas plants, and petrochemical complexes across Oman and the wider GCC. Because sample shut-off valve integrity is directly tied to safe, representative sample delivery, Seven Star LLC helps maintenance teams keep genuine replacement valves in stock for planned and unplanned sampling system service.

Working Principle: Air-Actuated Diaphragm Shut-Off

The Veriflow valve operates by using pneumatic actuation air to flex a diaphragm against a valve seat, physically isolating the flow path without any sliding stem seal in direct contact with the sample fluid. When actuation air pressure is applied, the diaphragm lifts away from the seat, allowing sample flow through the valve body; when actuation air is removed or reversed, the diaphragm returns to seal against the seat, shutting off flow. This diaphragm-based design eliminates the packing-gland leak paths associated with traditional stem-sealed valves, an important consideration for sample systems handling process streams that may be flammable, toxic, or otherwise hazardous.

Because the valve is air-actuated rather than solenoid-actuated directly at the valve body, it integrates cleanly with the Maxum Edition II’s centralized Solenoid Valve Control Module (SVCM) architecture, which routes pilot air to the diaphragm actuator on command from the analyzer’s system controller. This keeps electrical components away from the sample stream entirely, supporting safe operation in hazardous-area sampling system installations.

Engineering Design of the Veriflow Valve

The 1671004-103 valve is built to the 40 psig (3.77 bar) actuation pressure rating specified for Maxum Edition II sampling system service, with a compact body sized for direct integration into the analyzer’s sample conditioning and stream-selection manifold. Its diaphragm-based construction is chosen specifically for sample shut-off duty, where clean, repeatable isolation matters more than high-cycle-rate switching performance.

As with other pneumatically actuated valves in the Maxum II sampling system, correct installation depends on connecting the actuation air line to the appropriate SVCM output and verifying valve response during commissioning or after replacement, ensuring the shut-off function operates reliably as part of the analyzer’s overall sample safety interlock scheme.

Key Features

The Veriflow Air-Actuated Valve 1671004-103 provides dependable sample isolation for the Maxum Edition II sampling system. Key characteristics include:

• Diaphragm-based construction with no stem packing in contact with the sample fluid.
• Rated to 3.77 bar (40 psig) actuation pressure for standard Maxum II sampling system service.
• Air-actuated design compatible with the analyzer’s centralized SVCM pilot-air architecture.
• Used specifically as a sample shut-off valve within the sampling and stream-selection manifold.
• Genuine Siemens Maxum II part number for correct fit and safety-certified operation.

Industrial Applications

The Veriflow valve is used throughout Maxum Edition II sampling systems wherever a clean, leak-tight shut-off point is required in the sample conditioning path, including isolating the analyzer from the process stream during maintenance, supporting safety interlock logic that shuts off sample flow on fault conditions, and general sample stream management in refinery, gas processing, and petrochemical analyzer installations.

Seven Star LLC supports refinery instrumentation teams, gas processing operators, and petrochemical maintenance departments across Oman, Muscat, Sohar, and the broader GCC region with sourcing of Maxum Edition II sampling system valves, helping analyzer houses maintain safe, reliable sample delivery to their process gas chromatographs.

Technical Specifications

The table below summarizes the core specifications of the Siemens Maxum II Veriflow Air-Actuated Valve as supplied by Seven Star LLC.

Call To Action

Seven Star LLC is a dedicated supplier of Siemens Maxum Edition II process gas chromatograph spare parts and sampling system valves throughout Oman and the GCC. To request a formal B2B quotation, verify current stock availability, or confirm compatibility of the Veriflow Air-Actuated Valve 1671004-103 with your specific Maxum II sampling system, contact our instrumentation sourcing team today.