Introduction
The document discusses the importance and technical specifications of vapour recovery systems, particularly those manufactured by Dürr Technik in Germany. These systems are essential for petrol stations to comply with environmental regulations by preventing harmful petrol vapours from escaping into the atmosphere.

Regulatory Requirements
Since 2009, the EC Directive 2009/126/EC mandates the installation of Stage II vapour recovery systems in petrol pumps across many countries. These systems capture petrol vapours at the filling nozzle and return them to storage tanks, thus protecting health and the environment.

System Reliability
Legal requirements demand high reliability from vapour recovery systems. In Germany, if a system fails, the petrol pump must be shut down within 72 hours. A reliable vapour recovery pump with a constant flow volume is crucial for system efficiency.

Product Overview
Dürr Technik has been producing the MEX piston pump since 1994, designed specifically for vapour recovery. The pumps are known for their reliability and flexibility, with several hundred thousand units in operation worldwide.

Functionality
The system regulates the ratio of fuel pumped into the vehicle tank to the petrol vapour extracted, maintaining a 1:1 ratio using mechanical or electrical proportional valves.

Technical Specifications
The document provides detailed technical data for various models of MEX pumps, including flow volume, end pressure, motor power, and dimensions. The pumps are available with belt or direct drive systems and are certified according to ATEX, TÜV, QS, PTB, and PCEC standards.

Advantages
The MEX pumps offer several advantages, including maintenance-free operation, self-adjusting piston sealing, flame and explosion protection, and suitability for various environmental conditions. They are also service-friendly, with easily disassembled pump heads.

Conclusion
Dürr Technik's vapour recovery systems are robust, flexible, and designed to meet stringent regulatory requirements, ensuring safe and efficient operation in petrol stations worldwide.