slide valve(n = noun.artifact) - valve that opens and closes a passageway by sliding over a port;
is a kind of valve

N  stopper, stopple, plug, cork, bung, spike, spill, stopcock, tap, rammer, ram, ramrod, piston, stop-gap, wadding, stuffing, padding, stopping, dossil, pledget, tompion, tourniquet, cover, valve, vent peg, spigot, slide valve, janitor, doorkeeper, porter, warder, beadle, cerberus, ostiary.

aortic valve, atrioventricular valve, ball valve, bicuspid valve, blow valve, butterfly valve, cardiac valve, clack valve, clapper valve, escape valve, exhaust valve, foot valve, hair slide, heart valve, ileocecal valve, intake valve, kingston valve, lantern slide, left atrioventricular valve, let slide, microscope slide, mitral valve, mitral valve prolapse, mitral valve stenosis, pilot valve, poppet valve, pulmonary valve, pyloric valve, rectifying valve, relief valve, right atrioventricular valve, safety valve, semilunar valve, shunt valve, slide, slide action, slide back, slide by, slide down, slide fastener, slide projector, slide rule, slide trombone, sluice valve, thermionic valve, throttle valve, tricuspid valve, valve, valve rocker