Stop valve, scr system, and method for detecting leaks and/or identifying variations in metered amounts

Abstract

Disclosed is a stop valve (100) comprising a magnetic yoke (101), a solenoid coil (102), a compression spring (107) and an armature (105) on which an elastic membrane (106) is arranged. The membrane (106) can be sealingly pressed onto at least one fluid connection (108, 109). The stop valve (100) further comprises a guide (111) and a guide pin (110) that is connected to the armature (105). Finally, the compression spring (107) is positioned in such a way as to surround the solenoid coil (102). Also disclosed is a method for detecting leaks and/or identifying variations in metered amounts. Said method, which is carried on in an SCR system comprising the stop valve (100), involves opening the stop valve (100), whereupon a pressurized line is filled with a reducing agent and the stop valve (100) is closed. A pressure is subsequently lowered upstream of the stop valve (100) by shutting off a pump. Finally, any leak is detected and/or variations in the metered amount are identified by having the pressure sensor monitor the pressure downstream

Dependencies are inferred from the claim text.