A valve permitting a fluid under pressure an easier avenue of escape than normally; specif., a valve, actuated by the governor, used in one system of marine-engine governing to connect both ends of the low-pressure cylinder as a supplementary control. [Webster 1913 Suppl.]

aortic valve, atrioventricular valve, ball valve, bicuspid valve, blow valve, butterfly valve, cardiac valve, clack valve, clapper valve, electrical shunt, escape valve, exhaust valve, foot valve, heart valve, ileocecal valve, intake valve, kingston valve, left atrioventricular valve, mitral valve, mitral valve prolapse, mitral valve stenosis, pilot valve, poppet valve, portacaval shunt, pulmonary valve, pyloric valve, rectifying valve, relief valve, right atrioventricular valve, safety valve, semilunar valve, shunt, shunt circuit, shunt winding, slide valve, sluice valve, thermionic valve, throttle valve, tricuspid valve, valve, valve rocker