Abstract: An improved air bleed or full air discharge control valve assembly for a sphygmomanometer cuff in which a stem of the valve extends through and, in idle condition of the valve, sealingly engages the central opening of a resilient O-ring and is manipulated to release air either by being manually tilted about its inner end against a restoring force to temporarily enlarge the opening and thus provide a transient gap between the opening and the valve stem for accurately controlled bleed of air from the cuff during blood pressure measurements as long as the stem is tilted, or by being shifted axially to assume and maintain a position in which it permits rapid total air egress from the cuff through a central axial bore in the stem and at least one transverse opening from the bore to the outer surface of the stem.