of Meyer or Rider type, i.e. in which the expansion is varied at the expansion valve itself

Valve-gear or valve arrangements, e.g. with reciprocatory slide valves, other than provided for in groups > with valves other than cylindrical, sleeve, or part-annularly-shaped, e.g. flat D-valves > main valve being combined with auxiliary valve > of Meyer or Rider type, i.e. in which the expansion is varied at the expansion valve itself

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) > with valves other than cylindrical, sleeve, or part-annularly-shaped, e.g. flat D-valves > main valve being combined with auxiliary valve (of drag valve type F01L15/10) > of Meyer or Rider type, i.e. in which the expansion is varied at the expansion valve itself