Patent ID: 8074673

Claim:
A freeze-resistant metering valve, comprising: a magnetic part and a hydraulic part; the magnetic part having an armature biased by a spring; the hydraulic part having an annular space for receiving and conveying a urea-water solution and a tappet facing a valve seat, the annular space extending along at least a portion of the tappet; and the valve seat having a nozzle opening, wherein: the metering valve is itself passively relieved during freezing of the urea-water solution; a length of the annular space is created such that the magnetic part is positioned in a markedly lower temperature range than an end piece of the hydraulic part of the valve; the urea-water solution is introduced into an exhaust gas stream without use of compressed air; and an outlet is provided as a further opening in a vicinity of the nozzle opening, the further opening enabling a constant circulation of the urea-water solution such that the hydraulic part is cooled by the urea-water solution.