a novel valve , including a restoring spring which is pressed into a spring chamber opening and is held in the spring chamber opening by a radially oriented tension on one end of the spring ; the depth to which the restoring spring is pressed determines the magnitude of the spring force acting upon the valve closing part . by dispensing with an adjusting sheath , not only is the danger of chip formation in the press - fitting operation lessened , but the production cost of the valve is reduced substantially as well . the valve is used as a fuel injection valve for fuel injection systems .