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Despite much anticipation of valleytronics as a candidate to replace theageing CMOS-based information processing, its progress is severely hindered bythe lack of practical ways to manipulate valley polarization all-electricallyin an electrostatic setting. Here we propose a class of all-electric-controlledvalley filter, valve and logic gate based on the valley-contrasting transportin a merging Dirac cones system. The central mechanism of these devices lies onthe pseudospin-assisted quantum tunneling which effectively quenches thetransport of one valley when its pseudospin configuration mismatches that of agate-controlled scattering region. The valley polarization can be abruptlyswitched into different states and remains stable over semi-infinitegate-voltage windows. Colossal tunneling valley-pseudo-magnetoresistance ratioof over 10,000\% can be achieved in a valley-valve setup. We further propose avalleytronic-based logic gate capable of covering all 16 types of two-inputBoolean logics. Remarkably, the valley degree of freedom can be harnessed toresurrect logical-reversibility in two-input universal Boolean gate. The (2+1)polarization states -- two distinct valleys plus a null polarization --re-establish one-to-one input-to-output mapping, a crucial requirement forlogical-reversibility, and significantly reduce the complexity of reversiblecircuits due to the built-in nature of valley degree of freedom. Our resultssuggest that the synergy of valleytronics and digital logics may provide newparadigms for valleytronic-based information processing and reversiblecomputing.

Valleytronics in merging Dirac cones: All-electric-controlled valley filter, valve and universal reversible logic gate