valves

valve

noun

{bc}any of numerous mechanical devices by which the flow of liquid, gas, or loose material in bulk may be started, stopped, or regulated by a movable part that opens, shuts, or partially obstructs one or more ports or passageways

ball valve

noun

{bc}a valve in which a ball regulates the aperture especially by its rise and fall due to fluid pressure, a spring, or its own weight

bicuspid valve

noun

{bc}{sx|mitral valve||}

butterfly valve

noun

{bc}a valve consisting of two semicircular clappers hinged to a cross rib that permits fluid flow in only one direction

check valve

noun

{bc}a valve that permits flow in one direction only

escape valve

noun

{bc}{sx|safety valve||}

mitral valve

noun

{bc}a cardiac valve consisting of two triangular flaps which allow only unidirectional blood flow from the left atrium to the left ventricle

safety valve

noun

{bc}a valve (as for a steam boiler) that allows gas or liquid under excessive pressure to escape in a controlled manner

semilunar valve

noun

{bc}either of two heart valves of which one occurs between the heart and the aorta and the other between the heart and pulmonary artery and that consist of three crescent-shaped flaps that are forced apart by pressure in the ventricles during systole and pushed together by pressure in the arteries during diastole and which prevent regurgitation of blood into the ventricles

slide valve

noun

{bc}a valve that opens and closes a passageway by sliding over a port