Brand: Siemens

Siemens Maxum II Veriflow Air-Actuated Valve 1671004-103

Name: Siemens Maxum II Veriflow Valve 1671004-103 | Seven Star
Brand: Siemens

Description

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.

Parameter	Specification
Model / Part Number	Veriflow Air-Actuated Valve, P/N 1671004-103
Valve Type	Air-actuated diaphragm valve
Function	Sample shut-off
Actuation Pressure	3.77 bar (40 psig)
Target Platform	Siemens Maxum Edition II Process Gas Chromatograph
Control Interface	Pilot air from Solenoid Valve Control Module (SVCM)
Hardware Condition	New, genuine Siemens part number

Why Choose Seven Star LLC for Maxum II Sampling System Valve Sourcing

A sample shut-off valve on a hazardous process stream is a safety-relevant component, not a routine wear part – verifying the exact actuation pressure rating and SVCM compatibility before ordering matters because a mismatched valve can either fail to seal properly or fail to respond correctly to the analyzer’s safety interlock logic. Seven Star LLC’s sourcing team confirms the Veriflow valve’s actuation pressure and SVCM wiring configuration against the customer’s specific Maxum II sampling system before the part ships, rather than assuming a generic diaphragm valve will integrate correctly. We also help refinery and gas plant instrumentation teams plan spare valve stock for sampling systems handling flammable or toxic streams across Muscat, Sohar, and the broader GCC, since a compromised sample shut-off point is not something a facility can leave unresolved between scheduled maintenance visits.

Request a Quote for Siemens Maxum II Veriflow Air-Actuated Valve 1671004-103

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 availability and lead time, or confirm compatibility of the Veriflow Air-Actuated Valve 1671004-103 with your specific Maxum II sampling system, contact our instrumentation sourcing team today.

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About brand

Most Siemens automation parts are bought by article number, the string beginning 6ES7, 6AV2 or 6GK5 printed on every module. Founded in 1847 and headquartered in Munich, Siemens builds the SIMATIC controllers, SCALANCE networks and SINAMICS drives that plant engineers meet on almost every site. Seven Star LLC, an independent supplier, lists Siemens PLC and I/O modules, HMI panels, industrial Ethernet switches, drives, protection relays, temperature transmitters and gas analyzer spare parts for projects in Oman and the GCC.

Siemens product families on this page

Controller hardware covers the SIMATIC S7-1200 (CPU 1214C with SM 1223 signal modules) and the S7-1500 (CPU 1515-2 PN), with ET 200SP and ET 200M distributed I/O and their IM 155-6 and IM 153-2 interface modules. Operator panels include the KTP700 Basic and TP700 Comfort. SCALANCE XC208 managed switches handle industrial Ethernet. Drives are represented by the SINAMICS G120C compact inverter and the G120X for pumps and fans. From the power side come the SIPROTEC 7SJ85 feeder protection relay and SIVACON S8 switchboards, and from process instrumentation the SITRANS TH320 head-mounted temperature transmitter.

Where Siemens equipment is used

SIMATIC controllers and ET 200 I/O run packaged units, skids and whole process lines in water treatment, oil and gas, cement, food and manufacturing plants. SINAMICS drives control pumps, fans and conveyors, SCALANCE switches form the control network, and SIPROTEC relays protect medium voltage feeders and motors.

Ordering Siemens parts: what we need

Send the complete article number, the functional status or version printed on the module and, for CPUs, the firmware version your project was written for. For drives add power, supply voltage, filter option and fieldbus version. For SIPROTEC relays the long order number or product code is required, because it fixes the hardware and function package. A nameplate photo answers most of these points at once.

Frequently Asked Questions

What function does the 1671004-103 Veriflow valve serve?

It functions as a sample shut-off valve within the Maxum Edition II sampling system, isolating the analyzer from the process sample stream when required.

Why is a diaphragm valve used for sample shut-off?

Diaphragm valves isolate the actuating mechanism from the process fluid entirely, eliminating stem-packing leak paths and minimizing dead volume in the sample path.

What actuation pressure does this valve require?

The valve is rated to 3.77 bar (40 psig) actuation pressure, matching the standard Maxum Edition II sampling system specification.

How is the valve controlled on the analyzer?

The valve is air-actuated, receiving pilot air from the analyzer's Solenoid Valve Control Module (SVCM) on command from the system controller, keeping electrical components away from the sample stream.

Does Seven Star LLC supply this part across the GCC?

Yes, Seven Star LLC sources and supplies the Siemens Maxum II Veriflow Air-Actuated Valve 1671004-103 to refinery, gas processing, and petrochemical customers across Oman and the wider GCC region.

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