NAMUR Valves - Standard Temperature Applications -20 to 123 F (-29 to 50 C)

Product Overview

The Automatic Valve D20 Series NAMUR Valves for Standard Temperature Applications are solenoid pilot directional control valves designed for direct mounting to pneumatic valve actuators in process and industrial automation environments operating from -20 to 123 F (-29 to 50 C). Compliant with the NAMUR interface standard VDI/VDE 3845, these valves eliminate external tubing between the pilot valve and actuator, delivering a compact, standardized installation that reduces dead volume, minimizes leak points, and improves actuator response speed.

The D20 Series is available in two body height variants: the D2003 (1-1/4" body height) and the D2013 (1" body height), both with 1/4" NPT port size. Valve functions include 3/2 normally closed, 5/2 single or double solenoid, and 5/3 closed center, open center, and power center configurations. Maximum flow capacity is 1.8 Cv (1800 Nl/min) for 3/2 and 5/2 functions, and 1.4 Cv (1400 Nl/min) for 5/3 configurations.

The standard weather-proof DIN Form B coil provides hermetically sealed watertight protection for general industrial and outdoor process environments. The balanced spool construction with tapered Tee-Seal design has been validated to 20 million cycles per SAE specifications, establishing the D20 as the workhorse NAMUR valve for high-cycle general process automation. Port plugging enables field reconfiguration between 2-way and 3-way functions without replacing the valve body.

For procurement engineers, OEM control panel builders, and process plant engineers, the D20 Standard Temperature series provides a combination of high flow capacity, weatherproof electrical protection, long cycle life, and standardized NAMUR interface mounting that simplifies actuator specification, installation, and maintenance across rotating equipment, flow isolation, and process control applications.

Key Engineering Features

• Compact Balanced Spool Design - Balanced spool construction delivers compact size, low profile, and high performance in a direct-mount package, enabling installation on tight actuator assemblies typical of process plant valve trains and skids.
• Solenoid Pilot - Full Line Pressure Shifting - Three-way pilot uses full air line pressure (35-150 psig for internal supply) to shift the spool, providing fast and decisive actuation without intermediate pilot regulators or boosters.
• Weather-Proof Hermetically Sealed Coil - Solenoid coil is hermetically sealed as an integral watertight molded unit with NEMA 4X/IP65 protection, suitable for outdoor process installations, washing-down environments, and areas with high humidity or water splash.
• Tapered Tee-Seal - Eats Dirt - Bidirectional tapered Tee-Seal eliminates sticking problems by flexing to clean the spool on every stroke. Mechanically locked with no spiral twist or extrusion, it wipes away air line sediment and prevents spool binding even in contaminated or poorly filtered air systems.
• Push Non-Locking Manual Override - Standard push non-locking manual override provides manual valve actuation during power failure, commissioning, and troubleshooting without tools, reducing the time required to diagnose actuator and valve problems in the field.
• SAE Tested - 20 Million Cycle Durability - Proven reliable per SAE specifications with rust and water injected every 864,000 cycles across 20 million total cycles, validating consistent performance in high-cycle automation service without seal or spool wear-related failures.
• Field Convertible to External Pilot Supply - The pilot supply can be field converted from internal to external to accommodate applications where supply pressure is below 35 psig minimum or where independent pilot supply is required for fail-safe or isolation purposes.
• NAMUR Interface per VDI/VDE 3845 - Standardized direct-mount interface per VDI/VDE 3845 provides universal compatibility with pneumatic actuators from any compliant manufacturer, enabling multi-vendor sourcing, simplified spare parts management, and fast actuator swap-out during maintenance.
• Port-Pluggable Spool for 2-Way/3-Way Conversion - The balanced spool construction allows ports to be plugged for 2-way or 3-way function, or restricted for inexpensive cylinder exhaust speed control, providing configuration flexibility without additional valve bodies.
• Multiple Connection and Coil Options - Available with DIN Form B, 1/2" conduit, and molded lead coil connection options, plus dustproof coil variants, enabling integration with any plant wiring architecture from standard DIN to heavy-duty conduit installations.

Technical Specifications

General Specifications

Temperature Ratings

Standard temperature ratings apply to all D20 Series NAMUR variants with Buna-N seals and standard weather-proof coils. The temperature range covers the majority of general process automation and industrial manufacturing environments.

Important: For media temperatures below 40 F (4 C), compressed air must be free of water vapor to prevent ice formation inside the valve. Installations expecting temperatures below -20 F should consider the low-temperature series rated to -40 F.

Electrical Data (Solenoid Pilot Valves)

All solenoid coils are rated for continuous duty. The DIN Form B coil uses standard industrial connectors compatible with most process plant junction box wiring systems.

Electrical Connection Options

Flow Performance Data

Flow performance data for D20 Series NAMUR valves. Standard temperature operation from -20 to 123 F with Buna-N seals.

Certifications & Compliance

Typical Applications & Industries

Process Automation and Flow Control

• Automated ball valve, butterfly valve, and globe valve actuator pilot control throughout petrochemical refineries, chemical plants, and water treatment facilities where standardized NAMUR mounting simplifies valve skid construction and replacement.
• Modulating and on/off process valve actuator control in distillation columns, reactor feed systems, product transfer headers, and utility manifolds operating within the standard temperature range.
• Pipeline flow control and pig trap valve automation at gathering stations, compressor stations, and metering stations in moderate climate regions.
• Heat exchanger inlet and outlet valve automation where process streams are within the -20 to 123 F temperature range and reliable, high-cycle pilot valve performance is required.

Oil and Gas Upstream and Midstream

• Wellhead and production manifold valve actuator pilot control at onshore production facilities in temperate climate regions, where standardized NAMUR mounting reduces installation time and simplifies the valve assembly drawing package.
• Gas processing plant separator, scrubber, and dehydration unit valve automation using direct-mount NAMUR pilot valves to eliminate individual instrument tubing runs.
• Compressor station recycle, anti-surge, and block valve actuator control requiring reliable, high-cycle solenoid pilot performance at ambient conditions within the standard range.
• Refinery unit isolation, depressurization, and product routing valve automation where CSA/FM or explosion-proof certification is not required but weather-proof coil protection is specified.

Water and Wastewater Treatment

• Automated gate valve, butterfly valve, and plug valve actuator pilot control at water treatment plants, pumping stations, and distribution system interconnects requiring high-cycle, weather-resistant pilot valve performance.
• Digester gas and biogas valve control at wastewater treatment facilities where standard temperature operation and weather-proof coil protection meet all application requirements.
• Chemical dosing and disinfection system valve automation in water treatment where standard temperature ambient conditions apply and CSA/FM or intrinsic safety is not required.
• Sluice gate and diversion structure valve automation in dam and reservoir operations requiring long-service-life, maintenance-friendly NAMUR interface pilot valve designs.

Pulp, Paper, and Forest Products

• Automated valve control throughout pulp digester, bleaching, and washing circuits where process fluid temperatures and ambient conditions fall within the standard rating.
• Paper machine wet end valve automation including headbox, slice, and press section pneumatic actuator pilot control at standard operating temperatures.
• Recovery boiler black liquor valve and smelt tank isolation valve actuator control at kraft mills where general-purpose weather-proof coil protection is sufficient for the installation environment.
• Chip handling, screening, and knotting system pneumatic actuator control at standard mill ambient temperatures.

Pharmaceutical and Biotech Manufacturing

• Bioreactor and fermentation vessel inlet, outlet, and media transfer valve automation requiring reliable, high-cycle pilot valve performance in controlled ambient environments.
• Clean-in-place circuit valve control for sanitary process systems where NAMUR interface mounting enables compact, tube-free valve assembly designs that simplify CIP validation.
• Utility system valve automation including purified water, WFI, and clean steam distribution valve actuator pilot control at standard ambient conditions.
• Containment system valve automation in active pharmaceutical ingredient synthesis areas where standard ambient temperature conditions apply.

General Industrial and OEM Applications

• OEM machine builder integration for automated valve control on packaging machinery, bottle filling lines, material handling systems, and assembly automation where NAMUR interface direct-mount valves simplify actuator mounting and wiring.
• Conveying system divert valve, diverter gate, and sortation system pneumatic actuator control requiring high-cycle, reliable pilot valve performance at standard industrial ambient temperatures.
• Compressed air system pressure regulation, zone isolation, and safety shutoff valve actuator pilot control throughout manufacturing facilities.
• Automotive manufacturing plant pneumatic actuator control for welding fixture clamps, body-side lifts, and transfer line tooling requiring compact, reliable 5/2 or 5/3 NAMUR pilot valve solutions.

Ordering and Model Number Configuration

The Automatic Valve D20 Series NAMUR valve uses a structured model number system. Standard temperature configurations use Buna-N seals and standard weather-proof DIN or conduit coils. Key model examples include D2003AAWR, D2013AAWR (DIN coil, no voltage suffix = order separately), and D2003AAWR-DBCD (24VDC, 1/2" conduit with dustproof).

Standard temperature operation from -20 to 123 F applies to all D20 Series NAMUR valves with Buna-N seals and standard weather-proof coils. No special suffix is required to achieve this rating.

Voltage codes: DA = DC 12V, DB = DC 24V, AA = AC 120V 50/60 Hz, AB = AC 240V 50/60 Hz.

Body height suffix: 03 indicates 1-1/4" body height (D2003 series); 13 indicates 1" body height (D2013 series).

For dustproof coil protection, add D suffix (e.g., D2003AAWR-DBCD). For conduit installation, add C suffix (e.g., D2003AAWR-DBC).

Manual override options: Push Non-Locking (standard), Push Turn-Locking (suffix 1), Extended Turn-Locking (suffix 2), No Override (suffix 4).

Contact Automatic Valve at (248) 474-6761 for stainless steel body options, G (BSPP) port thread, transition plate configurations, and external pilot supply ordering codes.

Accessories

Solenoid Coil Assemblies

Replacement coils for D20 Series NAMUR valves are available in DIN Form B, 1/2" conduit, and molded lead configurations. All standard coils are rated for 123 F (50 C) ambient maximum. Specify voltage and coil type when ordering replacements.

Valve Conversion Kits

Valve conversion kits allow field reconfiguration between 4-way and 3-way functions, solenoid relocation (left/right), and internal to external pilot supply conversion. Refer to the Automatic Valve Valve Conversion Instructions document for procedures and part numbers.

Transition Plates

Transition plates (option P in model number) adapt the D2003 or D2013 NAMUR interface dimensions to specific actuator NAMUR mounting configurations. Confirm actuator interface compatibility with Automatic Valve before ordering transition plates.

Related Products & Accessories

• NAMUR Valves - High Temperature Applications - D20 Series NAMUR valves with CT coil option for 0 to 180 F high-temperature ambient service. https://www.automaticvalve.com/series/3008-namur-valves-high-temperature-applications
• NAMUR Valves - Low Temperature Applications - D20 Series NAMUR valves rated for low temperature operation down to -40 F (-40 C). https://www.automaticvalve.com/series/2987-namur-valves-low-temperature-applications
• NAMUR Valves - CSA/FM Standard Temperature - D20 Series NAMUR valves with CSA/FM explosion-proof certified solenoid coils for hazardous classified areas at standard temperatures. https://www.automaticvalve.com/series/2990-namur-valves-csafm-standard-temperature-applications
• NAMUR Valves - CSA/FM Low Temperature - D20 Series NAMUR valves with CSA/FM explosion-proof coils for hazardous area low-temperature service to -40 F. https://www.automaticvalve.com/series/2991-namur-valves-csafm-low-temperature-applications
• NAMUR Valves - ATEX Standard Temperature - D20 Series NAMUR valves with ATEX explosion-proof certified coils for European hazardous area installations. https://www.automaticvalve.com/series/2988-namur-valves-atex-standard-temperature-applications
• NAMUR Valves - Intrinsically Safe Standard Temperature - D20 Series NAMUR valves with intrinsically safe solenoid coils for Division 1/Zone 0 hazardous classified areas. https://www.automaticvalve.com/series/2992-namur-valves-intrinsically-safe-standard-temperature-applications

Frequently Asked Questions (FAQ)

Q: What is the temperature range for the standard temperature NAMUR series?

A: The standard temperature series operates from -20 to 123 F (-29 to 50 C) for both ambient and media conditions. This covers the majority of general process automation and industrial manufacturing applications in temperate climates.

Q: What is the difference between the D2003 and D2013 body variants?

A: Both variants use 1/4" NPT ports and share the same Cv rating of 1.8 (1800 Nl/min). The D2003 has a 1-1/4" valve body height and the D2013 has a 1" valve body height. Selection is based on which body height mates with the specific actuator NAMUR interface being used.

Q: What flow capacity does the D20 Series NAMUR valve provide?

A: The D20 Series delivers 1.8 Cv (1800 Nl/min) for 3/2 and 5/2 valve functions, and 1.4 Cv (1400 Nl/min) for 5/3 three-position functions. These values apply to both single and double solenoid 5/2 configurations.

Q: What is the minimum pilot supply pressure for internal pilot operation?

A: For 3/2 and 5/2 functions, internal pilot supply requires 35 to 150 psig (2.4 to 10.3 bar) at port 1. For 5/3 functions, the minimum pilot pressure is 50 psig (3.4 bar). Field conversion to external pilot supply is available when line pressure does not consistently meet these minimums.

Q: Can the 5/2 valve be reconfigured to 3/2 in the field?

A: Yes. The balanced spool construction allows exhaust or work ports to be plugged for 3-way or 2-way function in the field. Ports can also be restricted with a needle valve for inexpensive cylinder exhaust speed control without replacing the valve body.

Q: What does the Tapered Tee-Seal feature do for reliability?

A: The bidirectional tapered Tee-Seal flexes on every actuation stroke to physically clean the spool bore, removing air line sediment, particulates, and oxidation before they can accumulate and cause spool binding. The seal is mechanically locked to prevent spiral twist or extrusion failure. This self-cleaning action significantly extends time between preventive maintenance intervals in less-than-ideal air quality conditions.

Q: What is the cycle life rating of these valves?

A: The D20 Series has been validated per SAE specifications to 20 million cycles with rust and water injected every 864,000 cycles. In clean filtered air service, service life can substantially exceed this benchmark, making the D20 Series appropriate for high-cycle automation without planned valve replacement in normal service intervals.

Q: What coil connection types are available?

A: Coil connection options include DIN EN 43650 Form B (standard, blank suffix), 1/2" conduit with 30" leads (suffix C), high-temperature conduit rated to 180 F (suffix CT), dustproof coil (suffix D), and molded 18" leads (suffix G). All coils carry NEMA 4X/IP65 enclosure protection.

Q: Is the solenoid guaranteed against burnout?

A: Yes. The D20 Series solenoid is guaranteed against burnout under normal operating conditions. The coil is hermetically sealed as a watertight molded unit and is rated for continuous duty operation. Internal pilot using full line pressure ensures the coil operates well within its rated thermal envelope.

Q: What certifications does the standard temperature series carry?

A: The standard temperature D20 Series carries CSA (C22.2/UL STD 429) and Factory Mutual (FM) approval for solenoid components, CE marking for EU requirements, NEMA 4X/IP65 enclosure protection, and SAE 20-million-cycle durability validation. For hazardous area applications, see the CSA/FM, ATEX, or intrinsically safe series.

Q: What is the maximum operating pressure?

A: Maximum operating pressure is 150 psig (10.3 bar) for all D20 Series NAMUR valve functions. Minimum operating pressure varies by function: 35 psig for 3/2 and 5/2 internal pilot, 50 psig for 5/3 internal pilot.

Q: Is this valve compatible with non-lubricated air service?

A: Yes. The D20 Series NAMUR valves operate in both lubricated and non-lubricated air service. The Buna-N seals and stainless steel spool provide adequate lubricity and corrosion resistance for dry air applications.

Installation & Maintenance Guidelines

• Mount the valve directly to the pneumatic actuator NAMUR interface per VDI/VDE 3845. Verify O-ring condition and correct seating on the NAMUR interface face before tightening mounting fasteners.
• Torque mounting fasteners to the actuator manufacturer's specifications. Under-torquing will allow air leakage across the NAMUR interface O-ring faces; over-torquing can distort the aluminum body.
• Verify supply pressure at port 1 is within 35 to 150 psig for 3/2 and 5/2 functions, or 50 to 150 psig for 5/3 functions, under all expected operating conditions.
• Filter supply air to 40 microns or finer. The Tapered Tee-Seal self-cleans on every cycle, but contamination above 40 microns accelerates wear and reduces service life.
• For media temperatures below 40 F (4 C), ensure supply air dew point is below the minimum expected media temperature to prevent ice formation inside the valve.
• Test manual override function during commissioning to confirm spool actuates fully and the connected actuator responds correctly before energizing the solenoid.
• For DIN coil connection, use a compatible DIN EN 43650 Form B connector with appropriate cable and conduit entry gland for the installation environment.
• When using conduit coil option, ensure conduit is properly sealed at all entry points to maintain NEMA 4X/IP65 enclosure integrity.
• For 5/3 spring-center applications, verify that supply air pressure is consistently above 50 psig to ensure reliable centering force without pressure fluctuations causing incomplete center positioning.
• Verify exhaust ports are clear and unobstructed. Restricted exhaust prevents spool return and can cause actuator positioning errors. In dusty environments, periodically inspect and clean exhaust ports.

Warranty & Global Support

Automatic Valve provides a standard warranty on all D20 Series NAMUR valve products covering defects in material and workmanship from the date of purchase. Contact Automatic Valve for specific warranty terms.

Technical support and product configuration assistance is available by phone at (248) 474-6761 or through the Automatic Valve website at automaticvalve.com.

Automatic Valve is a global family member of ROSS Controls, with technical resources and distribution support available throughout the United States and internationally.

For complete technical data, dimensional drawings, operating instructions, valve conversion instructions, and the product catalog for NAMUR Interface Valves, visit the product series page at automaticvalve.com or contact the Automatic Valve team directly.

Product Catalog - NAMUR Interface Valves: https://www.automaticvalve.com/documents/5554/NAMUR_Interface_Valves_AV-NAMUR_en.pdf

Service Instructions - NAMUR Interface Solenoid Valves: https://www.automaticvalve.com/documents/408/NAMUR_Interface_Solenoid_Valves_Service_Form__AV-NAMUR-OI.pdf