The ZZV series self-acting micro-pressure regulating valve requires no external energy and uses the energy of the controlled medium for automatic regulation. It uses a balanced single-seat quick-opening regulating mechanism and provides stable pressure, high control accuracy for very low pressure, reliable sealing and an adjustable setpoint during operation. It is suitable for automatic micro-pressure regulation of fuel gases in industrial furnaces, protective gases for petroleum products or storage tanks, and heat-treatment protective gases.