| 摘要 |
The invention relates to a device for recovering hydrocarbon vapors in fuel delivery systems comprising a proportional throttle valve which is mounted in a vapor recovery line to a tank, with the valve being controlled by an error signal which is a function of the fuel volume flow and the vapor volume flow. Accordingly the vapor volume flow returned by a vacuum pump to the container is controlled. The invention further relates to the structure of the proportional throttle valve, including a tandem piston arrangement.
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