Patent ID: 7748403

Claim:
A pressure-holding valve for a fuel injection system including at least one fuel valve device having a high-pressure region and a low-pressure region, the valve comprising a valve housing ( 20 ) having a first connection ( 23 ) connectable to the low-pressure region and a second connection ( 24 ) connectable to the return of a fuel injection valve device, a reciprocating valve cup ( 25 ) contained in the valve housing, a first spring device ( 29 ) prestressing the valve cup, a through opening ( 31 ) in the valve cup, means ( 32 ) for alternatively opening and closing the through opening; a second spring device ( 33 ) applying a prestressing force to the means for opening and closing the through opening in order to maintain the through opening normally closed and thus maintain a minimum pressure in the return, and a pressure relief device ( 35 , 36 , 37 , 38 ) contained in the valve housing between the first connection and the valve cup, the pressure relief device being operable from outside the valve housing so as to provide communication from the second connection to the first connection and thus relieve pressure in the return.