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1. Profile: ZZY/ZZC/ZZV series self-actuated pressure regulating valve can undertake automatic regulation by using the energy of the regulated medium itself, with no any outside power applied. Besides energy saving, the products also features the free regulating of pressure set value during operation, flow characteristics of quick open, flexible action, good sealing performance, stable medium pressure, high regulating precision, small leakage and other advantages. The products are widely used in the automatic control of pressure releasing and stabilizing (applied in the front of the valve) of mediums like gas, liquid and steam used for various equipments in different industries such as petroleum, chemical, electrical power, metallurgy, foods, light textile, machinery manufacturing and civil buildings, etc. The products can also be used in the control of two kinds of fuel gas mix ratio in industry furnace burning system, or in the micro-pressure automatic regulation of the seal oil system of hydrogen cooled generator units, the fuel gas in industry furnace burning system, the protection gas for petroleum in-process products, oil house and heat treatment, etc. This series product is divided into ZZY standard type (self-actuated pressure regulating valve), ZZYP-16B II type (pilot operated self-actuated pressure regulating valve), ZZC type (self-actuated pressure difference regulating valve), ZZV type (self-actuated micro-pressure nitrogen sealing regulating valve) and other types of products. Nominal pressure level: PN (MPA): 1.6, 4.0, 6.4, 10.0; Diameter range of valve body: DN (MM): 15 300; Leakage level: level IV, level V; Flow characteristics: quick open. 2. Features: The set value regulation is carried out without production stopping; No stuffing applied, no friction when valve rod moving up and down, absolutely reliable upper seal; With extremely sensitive components applied on the actuating structure, any tiny pressure change can be detected; The cross joint valve body structure is compatible to both K and B type valves.