Description
ATEX Ex d NAMUR Poppet Solenoid Valve – Rotex 51424
The Rotex 51424 is an ATEX Ex d explosion-proof NAMUR solenoid valve featuring a poppet valve design for high-speed pneumatic actuator control in hazardous gas and dust environments.
Configurable for 3/2 or 5/2 way monostable operation, the 51424 can be used with single-acting or double-acting pneumatic actuators. Its single-solenoid design automatically returns the valve to its normal position when the electrical signal is removed.
Operating from 1 to 10 Bar, the valve combines a 6mm orifice, 12 L/min flow rate and hard-anodised aluminium construction with an ATEX Ex db / Ex tb enclosure rated IP66/IP67.
Valve Function & Operation
Function: 3/2 or 5/2 way monostable
Actuation: Single solenoid with return
Design: Poppet valve
The Rotex 51424 uses a poppet-style internal design intended for rapid pneumatic switching and high-speed cycling.
In 3/2 configuration, the valve can be used to control single-acting spring-return pneumatic actuators.
In 5/2 configuration, it can provide directional control for double-acting pneumatic actuators.
As a monostable valve, energising the solenoid switches the valve to its actuated position. When electrical power is removed, the valve automatically returns to its normal position.
Operating pressure: 1 to 10 Bar
NAMUR Mounting & Connections
The NAMUR mounting interface allows the Rotex 51424 to be installed directly onto a compatible pneumatic actuator, helping reduce external pneumatic tubing and simplifying actuator packages.
Connections:
1/4" BSP
1/4" NPT
Orifice: 6mm
Flow rate: 12 L/min
High-Speed Poppet Design
A key feature of the Rotex 51424 is its poppet construction, specifically intended for high-speed cycling applications.
This makes the valve particularly useful for automated pneumatic systems where rapid and repetitive actuator operation is required.
Unlike some of the other Rotex NAMUR valves in this range, the supplied specification does not state a maximum cycles-per-minute figure or mechanical life expectancy for the 51424, so I would not add the 500 cycles/min or >20 million cycle claims from the 51450 series to this page.
Construction & Materials
Body: Hard-anodised aluminium
Internals:
Aluminium
Stainless steel
Seat seal: NBR
Suitable media:
Air
Inert gases
Valve temperature range: -20°C to +80°C
This is a more focused pneumatic specification than the broader seal and construction choices available on some of the other Rotex NAMUR models.
Manual Override Option
An optional manual override is available for commissioning, maintenance and local actuator testing.
Push – momentary manual operation
Push and turn – retains the manually selected position
This allows the actuator to be operated locally without requiring an electrical control signal.
ATEX Ex d Explosion Protection
The Rotex 51424 uses an ATEX-certified explosion-proof solenoid enclosure with integrated electrical terminals.
ATEX certificate: TI22ATEX 278X
Marking: II 2GD
Gas protection:
Ex db IIC T6 / T5 Gb
Dust protection:
Ex tb IIIC T80°C / T95°C Db
Ingress protection: IP66 / IP67
Certified ambient ranges:
T6: -40°C to +60°C
T5: -40°C to +70°C
The valve itself has a stated operating temperature of -20°C to +80°C. The ATEX ambient limits above relate to the certified explosion-protected solenoid enclosure and its temperature classification.
Coil & Electrical Specification
Coil size: III 14mm
Power: 8 Watts
Insulation: Class H
Protection: IP66 / IP67
Available voltages:
12V DC
24V AC/DC
48V AC/DC
110V AC/DC
230V AC/DC
Voltage tolerance: ±20%
Except for 12V DC, the ATEX coils are rectified and accept either AC 50/60Hz or DC input at the specified voltage.
Explosion-Proof Enclosure
Enclosure options:
Aluminium
316 stainless steel
Conduit entry:
M20 × 1.5
1/2" NPT
Entry orientation: Horizontal
The enclosure incorporates integrated electrical terminals for a robust hazardous-area electrical connection.
Typical Applications
The Rotex 51424 is particularly suited to high-speed pneumatic actuator control, automated ball and butterfly valves, process machinery, oil and gas installations, petrochemical plants, chemical processing, refineries, process skids and other hazardous-area pneumatic automation systems.
The poppet design and 1–10 Bar operating range make this model particularly interesting where rapid actuator response is more important than the wider material and seal options offered by the 51450 series.
Why Choose the Rotex 51424?
The main differentiator of the Rotex 51424 is its high-speed poppet design combined with direct NAMUR mounting and ATEX Ex d protection.
It provides selectable 3/2 or 5/2 monostable operation, 1–10 Bar pressure capability, a 6mm orifice and IP66/IP67 hazardous-area protection in a compact actuator-mounted package.
For customers primarily searching for a fast-acting ATEX NAMUR solenoid valve, I think this page is worth positioning around the poppet/high-speed aspect rather than making it look too similar to the 51450V02-06 page.
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