Parker Lucifer 341N31 NAMUR Solenoid Valve

Overview

The Parker Lucifer 341N31 solenoid valve is a 5/2-way NAMUR valve for pneumatic actuators, from the Lucifer F-402 series with anodised aluminium body, as defined by the official Lucifer datasheet for 341N31-347N31. This example is the single solenoid (monostable) version, identified in the original listing as 24 V dc, 9 W, G1/4 ports, 5/2 function and 2-10 bar working pressure, with assembly reference 341N31-481865.

The 341N31 is a pilot operated spool valve that mounts directly on the NAMUR interface of pneumatic actuators, providing the 5/2-way pilot signal that drives the actuator in both directions. The function can be converted between 5/2 and 3/2 by rotating the mounting plate 180°, per the official datasheet.

Engineering & Design

The F-402 aluminium series valves are pilot operated with an integrated pilot, and the 341N31 solenoid valve provides a 5/2 function with a single solenoid (monostable, spring return). The valve has G1/4 NAMUR connections, a 4.0 mm passage diameter, a flow factor Qn of 400 L/min at 6 bar inlet with 1 bar differential pressure, and a working pressure range of 2 to 10 bar, per the official Lucifer F-402 datasheet.

The body is anodised aluminium with NBR seals, and the working temperature range is -25 °C to +80 °C depending on the coil version. The standard coil is the 481865 type with a 2P+T connector (EN 175301-803), insulation class F (155 °C) and IP65 protection, with Ex versions available (Ex db mb IIC T4 and Ex ia IIB T6 coils).

Key Features

• 341N31 solenoid valve, 5/2-way NAMUR, single solenoid, monostable
• Pilot operated, F-402 aluminium series, anodised aluminium body
• G1/4 NAMUR connections, 4.0 mm passage, Qn 400 L/min
• Working pressure 2-10 bar, NBR seals
• Function convertible between 5/2 and 3/2
• Coil 481865 with connector, IP65, insulation class F

Applications

• The 341N31 solenoid valve provides pilot control of pneumatic actuators with NAMUR interface
• On/off and fail-safe control of process valves
• Actuator control in chemical and process plants
• Replacement duty for existing 341N31 installations

Specifications

Compatibility & Integration

The 341N31 solenoid valve mounts directly on actuators with a NAMUR interface and connects to the plant control circuit through the solenoid coil connector. The function can be changed between 5/2 and 3/2 by rotating the mounting plate 180°, which gives maintenance teams flexibility without changing the valve, and Ex-rated coil versions are available for hazardous areas.

Before installation, confirm the required function, the actuator air consumption and the plant air supply pressure. Our team can confirm the configuration and function details against your application before dispatch.

Ordering Information

To order the Parker Lucifer 341N31 solenoid valve from Seven Star LLC, quote the model number, the valve function and the coil voltage. We confirm availability and delivery to your site in Oman or anywhere in the GCC, and we verify the configuration against your actuator before dispatch.

Why Seven Star LLC

Seven Star LLC supplies process control valves and pneumatic components to industrial customers across Oman and the wider GCC region. Every Parker Lucifer 341N31 valve we supply is checked against the model number and configuration before dispatch, and our team confirms the valve matches your application before you order.

FAQ

Identifying the Correct Replacement Valve

NAMUR valves from the Lucifer range look very similar, so a replacement should be matched from the markings rather than by appearance. On the valve body and coil, check the following:

• The valve reference 341N31, which identifies the monostable 5/2 aluminium version of the F-402 series.
• The coil reference, such as 481865, together with the voltage and power printed on the coil.
• Any Ex marking on the coil if the valve sits in a hazardous area, since the replacement must carry the same or a suitable approval.
• The port size and the mounting interface on the actuator.

Photographs of the valve label and the coil nameplate are usually enough for the Seven Star LLC team to confirm the part.

Mounting and Commissioning

Clean the NAMUR face of the actuator and fit new gaskets before mounting the valve. Check the orientation of the mounting plate: it defines whether the valve works as 5/2 for double-acting actuators or 3/2 for spring-return actuators, as described above. Connect a filtered, dry air supply within the working pressure range, fit silencers or exhaust protection, then energise the coil and stroke the actuator fully in both directions.

Maintenance and Troubleshooting

Most problems with a pilot operated NAMUR valve come from the air supply. A valve that does not switch may have insufficient pilot pressure; slow operation often points to blocked exhausts or undersized supply tubing; and continuous leakage usually means worn seals or dirt in the spool. Check the coil resistance and connector if the solenoid does not respond at all.

Applications in Oman and the GCC

On-off valve automation in oil and gas, water and power plants across the region often relies on this style of valve to control quarter-turn actuators. Seven Star LLC supplies the 341N31 solenoid valve and checks the coil and approval details before dispatch, so the 341N31 solenoid valve can be fitted without modification.

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