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NAMUR

NAMUR is a European standards association — the Normenausschuss für Mess- und Regelungstechnik (Standards Committee for Measurement and Control Technology) — whose interface specifications are widely adopted in process automation. The NAMUR interface, often referred to as a NAMUR valve pattern, defines a standardized mounting footprint and port arrangement that allows solenoid valves to be mounted directly onto pneumatic actuators without additional piping. This direct-mount configuration reduces installation time, minimizes leak paths, and simplifies maintenance because the valve can be replaced without disturbing the actuator or process connection. The NAMUR standard also specifies signal levels and electrical characteristics for proximity sensors and solenoid drivers, which is why the term appears across valve, sensor, and control-system documentation.

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About NAMUR

NAMUR is a European standards association — the Normenausschuss für Mess- und Regelungstechnik (Standards Committee for Measurement and Control Technology) — whose interface specifications are widely adopted in process automation. The NAMUR interface, often referred to as a NAMUR valve pattern, defines a standardized mounting footprint and port arrangement that allows solenoid valves to be mounted directly onto pneumatic actuators without additional piping. This direct-mount configuration reduces installation time, minimizes leak paths, and simplifies maintenance because the valve can be replaced without disturbing the actuator or process connection. The NAMUR standard also specifies signal levels and electrical characteristics for proximity sensors and solenoid drivers, which is why the term appears across valve, sensor, and control-system documentation.

3G Electric supplies NAMUR-interface solenoid valves and related components from Bonomi, a manufacturer whose NMR Series covers both general-purpose and hazardous-location variants. The Bonomi NMR Series includes single-solenoid and double-solenoid configurations, with 3-port and 4-port options, all using 1/4 in NPT inlet and outlet connections. Coil voltages span 12V DC, 24V DC, 110V AC, and 220V AC, allowing integration with common control-panel supplies. General-purpose models use a DIN solenoid connector, while hazardous-location models use a conduit connector and carry FM Approvals for various Class I, II, and III divisions and groups. These ratings make the hazardous-location variants suitable for environments where flammable gases, combustible dust, or ignitable fibers may be present.

The product family is used primarily for pneumatic actuator control in industrial automation and process valve actuation. Typical applications include on/off control of quarter-turn valves, spring-return actuators, and double-acting actuators in chemical, petrochemical, pharmaceutical, and food-processing plants. The NAMUR mounting pattern allows the valve to be attached directly to the actuator's NAMUR pad, eliminating the need for tubing between the valve and actuator. This reduces assembly time and potential leak points. The 1/4 in NPT ports accept standard fittings, and the 3-port configuration is typically used for spring-return actuators, while the 4-port configuration supports double-acting actuators.

3G Electric maintains inventory of Bonomi NMR Series valves across the voltage and certification range, including models such as NMR1-D12, NMR1-EX2, NMR1-EX22, NMR3-EX22, NMR1-EX12, NMR3-EX2, NMR3-EX1, and DNMR-EX2. Each listing includes manufacturer part numbers, coil voltage, port count, connection size, and hazardous-location ratings where applicable. Datasheets and technical documentation are available to support specification and procurement. 3G Electric ships globally and provides logistics support for both standard and hazardous-location variants, helping plant engineers and maintenance teams source the correct NAMUR valve for their actuator and environment.

Common Applications

  • Chemical processing — Bonomi NMR Series single-solenoid valves (e.g., NMR1-D12) for on/off control of pneumatic quarter-turn valves on reactor feed lines.
  • Petrochemical plants — Bonomi NMR Series hazardous-location valves (e.g., NMR1-EX2, NMR3-EX2) for actuator control in areas classified for flammable gases or combustible dust.
  • Pharmaceutical manufacturing — Bonomi NMR Series valves with 24V DC coils (e.g., NMR1-EX2) for clean pneumatic actuation of diaphragm valves in batch processing.
  • Food and beverage — Bonomi NMR Series general-purpose valves (e.g., NMR1-D12) for sanitary valve actuation where washdown and frequent cycling are required.
  • Oil and gas — Bonomi NMR Series double-solenoid hazardous-location valves (e.g., DNMR-EX2) for fail-safe control of double-acting actuators on pipeline valves.
  • Power generation — Bonomi NMR Series valves with 110V AC or 220V AC coils (e.g., NMR3-EX1, NMR1-EX22) for actuator control in boiler and turbine auxiliary systems.

Frequently asked questions

Common questions about NAMUR from 3G Electric.

What is the NAMUR interface on a Bonomi NMR Series solenoid valve?

The NAMUR interface is a standardized mounting pattern defined by the NAMUR association (Normenausschuss für Mess- und Regelungstechnik). On Bonomi NMR Series valves, it consists of a flat mounting face with port openings arranged to match the NAMUR pad on pneumatic actuators. This allows the valve to be bolted directly to the actuator, eliminating external tubing between valve and actuator. The interface also standardizes the port function labeling (typically 1, 2, 3, 4, 5) and the electrical connection point. Bonomi NMR valves use this pattern with 1/4 in NPT inlet and outlet ports, and are available in 3-port and 4-port configurations for spring-return and double-acting actuators respectively.

What voltages are available for Bonomi NMR Series solenoid valves?

Bonomi NMR Series solenoid valves are available with 12V DC, 24V DC, 110V AC, and 220V AC coils. The specific voltage is indicated in the model number and product specifications. For example, NMR1-D12 uses a 12V DC coil, NMR1-EX2 uses 24V DC, NMR3-EX1 uses 110V AC, and NMR1-EX22 uses 220V AC. Both general-purpose and hazardous-location variants cover these voltages. When selecting a valve, confirm the available control-panel supply and whether the coil is AC or DC, as this affects the required power supply and wiring. 3G Electric lists the coil voltage for each SKU to simplify selection.

What hazardous-location ratings do Bonomi NMR Series valves carry?

Bonomi NMR Series hazardous-location solenoid valves carry FM Approvals for various Class I, II, and III divisions and groups. Specific ratings vary by model. For example, NMR1-EX2 is rated for Class III, Division II, Group A; NMR1-EX12 is FM Approved for Class II, Division I; NMR3-EX2 is rated Class III, Division I, Group F; and DNMR-EX2 is rated Class II, Division II, Group E. These ratings cover environments with flammable gases, combustible dust, or ignitable fibers. Always verify the specific rating required for your area classification and confirm it matches the valve's nameplate before installation.

What is the difference between single-solenoid and double-solenoid Bonomi NMR valves?

Single-solenoid Bonomi NMR valves have one solenoid operator and typically use a spring-return mechanism. When the solenoid is energized, the valve shifts to the actuated position; when de-energized, the spring returns it to the normal position. These are often used with spring-return actuators. Double-solenoid valves have two solenoid operators and no spring return. Energizing one solenoid shifts the valve, and it remains in that position until the other solenoid is energized. These are used with double-acting actuators that require positive control in both directions. Both types are available in the NMR Series, with double-solenoid models such as DNMR-EX2 offered in hazardous-location configurations.

What port sizes and configurations are available in the Bonomi NMR Series?

Bonomi NMR Series solenoid valves use 1/4 in NPT inlet and outlet ports. They are available in 3-port and 4-port configurations. The 3-port configuration is typically used for spring-return actuators, where one port supplies pressure, one exhausts, and one connects to the actuator. The 4-port configuration is used for double-acting actuators, providing pressure and exhaust to both sides of the piston. The NAMUR mounting face itself has standardized port openings that align with the actuator pad. All models in the NMR Series share the same 1/4 in NPT connection size, simplifying fitting selection and replacement.

How does 3G Electric support Bonomi NMR Series solenoid valve procurement?

3G Electric maintains inventory of Bonomi NMR Series solenoid valves across the voltage and certification range, including general-purpose and hazardous-location models. Each product listing includes the manufacturer part number, coil voltage, port count, connection size, and hazardous-location rating where applicable. Datasheets and technical documentation are available to support specification and verification. 3G Electric ships globally and provides logistics support for both standard and hazardous-location variants. For procurement, you can request a quote with the specific model numbers, quantities, and any required certification documentation. The team can assist with cross-referencing and identifying the correct NAMUR valve for your actuator and environment.