Patent ID: 7278625

Claim:
A valve device for metering a fluid for the after treatment of exhaust gases from internal combustion engines, comprising a valve body ( 3 , 18 , 19 ; 21 ) having a working chamber ( 10 ; 22 ), and an outlet opening ( 9 ; 99 ), a valve plate ( 6 ; 66 ) movably supported in the working chamber in order to open and close the outlet opening ( 9 ; 99 ) of the working chamber, and a flexible wall ( 23 , 28 , 31 ) that flexes under pressure and/or contains at least one compressible element ( 7 ) at least partially bounding the working chamber so that the volume of the working chamber can change in the event that the fluid contained therein undergoes a phase change, further comprising a valve holder ( 2 ) movably supporting the valve body and connecting it to a line ( 17 ) in such a way that the valve body can execute a compensation movement to enlarge the line volume if the fluid contained in the line freezes, and further comprising a spring element fastened to the valve holder ( 2 ) for moving the valve body back toward the line as soon as the frozen fluid in the line melts.