Webster’s Revised Unabridged Dictionary · 1913
D valve
D′ valve′ (dē′ vălv′). (Mech.) A kind of slide valve. See Slide valve, under Slide.
Webster’s Revised Unabridged Dictionary · 1913
D′ valve′ (dē′ vălv′). (Mech.) A kind of slide valve. See Slide valve, under Slide.