Balanced zero regulator is a precise gas flow control regulator for all combustion systems. It features a rugged, large diaphragm actuated valve assembly, sensitively balanced at near zero pressure. Gas flow is initiated by a very small pressure differential across the main diaphragm. Gas supply is precisely modulated on system demand by negative or positive signals from suction mixers or controlled pressure from an external source. This regulator delivers gas at a precise pressure, even with slight inlet pressure variations. The regulator design assures highest accuracy over full flow range: with no friction between sensitively counterbalanced parts. It assures dependable, precise gas flow control on all types of combustion systems including proportioning premixers, nozzle mixers and mixing tees at positive or negative combustion chamber pressures.