characterised by having means for effecting pressure equilibrium between two different cylinder spaces at idling

Full Title

Valve-gear or valve arrangements, e.g. with reciprocatory slide valves, other than provided for in groups F01L17/00 - F01L29/00 (valve drive or external valve-adjustment during operation, tripping-gear or tripping of valves F01L31/00) > characterised by having means for effecting pressure equilibrium between two different cylinder spaces at idling