characterised by the provision of means for rotating lift valves, e.g. to diminish wear

Valve-gear or valve arrangements, e.g. lift-valve gear > characterised by the provision of means for rotating lift valves, e.g. to diminish wear

Valve-gear or valve arrangements, e.g. lift-valve gear (lift-valve and valve-seat assemblies per se F01L3/00; slide-valve gear F01L5/00; actuated non-mechanically F01L9/00; valve arrangements in working piston or piston rod F01L11/00; modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations F01L13/00) > characterised by the provision of means for rotating lift valves, e.g. to diminish wear