Conveying device for injecting fluid, particularly in exhaust gas system of internal combustion engine, has one-way valve and return line, which carry out outflow of operating fluid from dosing and injection module

摘要

The conveying device has a dosing and injection module (10), where a pump (8) is formed to promote an operating fluid (2) from a reservoir (4) to the dosing and injection module. A throttled overflow channel (9) is provided, which connects an output of the pump at an input. A one-way valve (15) and a return line (16) are provided in the overflow channel, where a switchable valve (14) is arranged. The one-way valve and return line carry out an outflow of the operating fluid from the dosing and injection module. An independent claim is also included for a method for operating a conveying device.