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The ZZY type self-operated pressure control valve does not need external energy. It uses the energy of the regulated medium itself as the power source and introduces it into the actuator to control the position of the valve spool. By changing the pressure difference and flow at both ends, the pressure before (or after) the valve is stabilized. It has the advantages of sensitive action, good sealing performance, and small fluctuation of pressure setting points. It is widely used in the automatic control of pressure reduction and stabilization or pressure relief and stabilization of gases, liquids, and steam media.