A valve opening arrangement, comprising: a valve arrangement comprising a valve (53a, 53b), the valve (53a, 53b) being movable against a force from a first valve position to a second valve position, said valve arrangement further comprising a bridge connected to a valve stem (59a, 59b) associated with said valve (53a, 53b), said bridge comprising a contacting surface; a rocker shaft; and a hinged rocker arm comprising a first wing, the first wing comprising a circular first opening for receiving the rocker shaft so that the first wing is pivotably mounted on the rocker shaft, and a first contacting surface, and a second wing, the second wing comprising a circular second opening for receiving the rocker shaft so that the second wing pivotably mounted on the rocker shaft, and a second contacting surface, wherein the first opening and the second opening are coaxial when the first and second wings (23, 31) are mounted on the rocker shaft, the first contacting surface and the second contacting surface being adapted to contact each other and thereby transfer a force in a direction transverse to an axis of the rocker shaft such that a third contacting surface on the hinged rocker arm contacts the valve arrangement and moves the valve against the force from the first valve position to the second valve position, said valve opening arrangement comprising a second rocker arm pivotably mounted on the rocker shaft and comprising a fourth contacting surface, wherein the second rocker arm comprises a fifth contacting surface and the hinged rocker arm comprises a sixth contacting surface, the fifth contacting surface and the sixth contacting surface being arranged so that, when the second rocker arm pivots from the first second rocker arm position to the second second rocker arm position, the fifth contacting surface and the sixth contacting surface contact each other so that a second force in a direction transverse to the axis of the rocker shaft is transferred between the second rocker arm and the hinged rocker arm, characterized in that the second rocker arm is pivotable between a first second rocker arm position and a second second rocker arm position and being arranged to contact the bridge, with the fourth contacting surface contacting the contacting surface on the bridge, to move the valve against the force from the first valve position to the second valve position when the second rocker arm pivots from the first second rocker arm position to the second second rocker arm position. a valve arrangement comprising a valve (53a, 53b), the valve (53a, 53b) being movable against a force from a first valve position to a second valve position, said valve arrangement further comprising a bridge connected to a valve stem (59a, 59b) associated with said valve (53a, 53b), said bridge comprising a contacting surface; a rocker shaft; and a hinged rocker arm comprising a first wing, the first wing comprising a circular first opening for receiving the rocker shaft so that the first wing is pivotably mounted on the rocker shaft, and a first contacting surface, and a second wing, the second wing comprising a circular second opening for receiving the rocker shaft so that the second wing pivotably mounted on the rocker shaft, and a second a first wing, the first wing comprising a circular first opening for receiving the rocker shaft so that the first wing is pivotably mounted on the rocker shaft, and a first contacting surface, and a second wing, the second wing comprising a circular second opening for receiving the rocker shaft so that the second wing pivotably mounted on the rocker shaft, and a second contacting surface,