Backflow Prevention for Natural Gas Vehicles & CNG Filling Stations
Wherever natural gas is intended to flow in only one direction, WEH® Check Valves provide a reliable solution. Whether in passenger cars, trucks, buses, or stationary systems – WEH CNG backflow preventers protect pipeline systems from unwanted reverse flow and enhance operational safety. Depending on the application, versions are available for both vehicle and fueling station integration. The valves are designed in accordance with DIN EN 736-1 and, depending on the model, meet the ECE approval requirements for use in road-licensed vehicles.
Compact, durable & flow-optimized
WEH® CNG Check Valves stand out with their robust stainless steel housing, intelligent seal configuration, and durable design. This ensures optimal protection of sealing components even in the presence of contaminated natural gas. The flow-optimized design allows for virtually silent opening and closing—maximizing operational safety while minimizing maintenance requirements. Thanks to various connection configurations, the valves can be flexibly integrated into existing systems—from fueling stations to onboard vehicle networks.
Compact, durable & flow-optimized
Robust stainless steel design
Corrosion-resistant, pressure-tight, and ideal for long-term use under high pressure
Quiet opening & closing
Optimized internal geometry for quiet operation – ideal for vehicles
High tightness for maximum operational safety
Reliable sealing protects the piping system – even under high pressure and in critical environments
Non-return stop in accordance with DIN EN 736-1
Reliable one-way media stop – prevents malfunctions and protects downstream components
ECE approval for road vehicles
Compliant for use in cars, trucks & buses – ideal for OEMs and system operators
The CNG refueling components at a glance
Additional components:
- Refueling components
- Service receptacle
- Defueling Nozzle
- Accessories
Typical Applications at a Glance
CNG refueling
Whether car, bus or truck – WEH® offers the right components for every CNG refueling system. From the filling station to the vehicle, our systems ensure smooth processes for all pressure levels and standards.
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Why WEH?
Quality You Can Rely On
Our products are manufactured to the highest standards. At WEH, quality is no coincidence – it’s our standard, ensured by 100% final inspection and certified processes.
Service You Can Rely On
By choosing a WEH® product, you’ve chosen long-lasting quality. And our service ensures it stays that way. Whether maintenance, inspection, repair, or original spare parts – our experienced team is committed to maximum safety, efficiency, and preserving the value of your equipment.
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Questions about application, technology, or spare parts? Our technical support team is here for you – direct, competent, and without detours. Personally available and globally reliable.