ZZC self-operated differential pressure regulating valve is an energy-saving product without external energy, which uses the pressure change of the medium in the process pipeline to compare with the signal, so that the force of the regulated medium is balanced with the output force of the actuator to achieve stable pressure and differential pressure value. ZZCP-1 differential pressure valve, using balanced single-seat valve, stable pressure, high precision, good sealing, used to control small differential pressure. ZZCN-10 differential pressure valve adopts double-seat valve, large flow coefficient, positive and inverted valve core, can form two different varieties of regulating valve products. The product is suitable for controlling the mixing ratio flow of two fuels and gases in various industrial furnace combustion systems or used in hydrogen-cooled generator set sealing oil systems, and can also be used for automatic control of depressurization, stabilization or pressure relief of various industrial gases.