Gas Reducer Ventrex Class B II E IV

The Ventrex OE A2424700407 pressure reducer is an electronic bistable component used in the methane systems of Mercedes vehicles. Certified according to ECE R110 regulations, it is designed to safely manage the high pressures of compressed natural gas (CNG), reducing them to a level compatible with the operation of the injectors (approximately 5–9 bar absolute).

Constructed from high-strength metal alloy, it features a series of functional connections:

• High-pressure methane inlet
• Outlet to the injector rail
• Two fittings for the cooling circuit
• Electrical connectors for the regulation solenoid valve (N372) and for the integrated pressure sensor (G400)

DIPA offers a range of original and aftermarket spare parts of equivalent quality.

Most common faults and defects

Despite its advanced architecture, the reducer may develop a series of problems over time. Below are the most frequently observed faults on this component:

Gas leakage or pressure drop

Although rubber membranes are less prone to rupture than mechanical models, seals and valve seats can degrade, causing leaks. Symptoms include:

• Detectable gas smell outside or inside the cabin
• Whistling sounds audible with the hood open
• Unusual transitions from methane to gasoline during acceleration
• Pressure drops during power demand

Freezing of the reducer

In cold environments or with a recently started engine, external ice buildup may indicate lack of coolant circulation. Causes include:

• Presence of air in the circuit
• Obstructions or malfunctions of the pump
• Degradation of seals due to low temperatures

Freezing can cause interruption of methane supply and forced switching to gasoline.

Failure of the regulation solenoid valve (N372)

The solenoid valve may become stuck in the closed position (no flow) or open (excessive pressure). Both conditions compromise system reliability and trigger a safety intervention by the control unit, which temporarily disables methane supply.

Integrated pressure sensor (G400)

This sensor detects the high-pressure side of the CNG circuit. In case of malfunction, it can:

• Generate incorrect readings of the methane level
• Activate the CNG warning light or engine warning light
• Store fault codes in the control unit

Signs to monitor

To prevent serious faults, it is important to pay attention to certain malfunction signals:

• Difficulty starting on methane, especially after long stops
• Uncommanded transitions to gasoline while driving
• Frost or ice on the reducer
• Persistent smell of methane
• Performance drop when cold

During maintenance, it is recommended to:

• Check the correct circulation of the coolant
• Visually inspect hoses and connections
• Periodically replace the gas filter, if present, to prevent circuit contamination

Conclusion

The Ventrex OE A2424700407 CNG reducer offers a modern and technologically advanced solution for Mercedes vehicles powered by CNG. Although it improves performance compared to previous mechanical systems, it requires attention and maintenance to ensure longevity and safety.

DIPA supports customers throughout the entire process, from order to after-sales assistance. Also inquire about the availability of new or refurbished components ready for quick replacements and reduced vehicle downtime.