"Slide" . "flat valves" . "balanced slide valves" . "Murdoch's D type slide valves" . . "Murdoch's D unbalanced slide valves" . . "unbalanced slide valves" . "D type balanced slide valves" . "sliding valves" . "Murdoch's D slide" . "balanced slide" . "slide valves" . . "slide-valve" . . . "Slide valve" . "Slide valve" . . "slide-valved" . "Slide valve#Balanced slide valve" . "slide" . "Richardson balanced slide" . "slide-valves" . "Slide valve#Murdoch's D slide valve" . "Richardson balanced slide valves" . "Slide_valve" . "Balanced slide" . "slide valve" . "Murdoch's D slide valves" .