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ZZY type self operated pressure regulating valve (referred to as pressure regulating valve) is an actuator product that utilizes the energy of the regulated medium to achieve automatic regulation. The biggest feature of this product is that it can work in places without electricity or gas, and is an energy-saving product. The pressure setting value can be adjusted freely during operation. Conventional products adopt fast opening flow characteristics, as well as linear and equal percentage flow characteristics. Sensitive in action, the pressure reduction ratio can generally reach a maximum of 10 and a minimum of 1.25. It is widely used in various industrial equipment such as petroleum, chemical, power, metallurgy, food, light textile, residential buildings, etc. for low pressure differential pressure reduction and stabilization (used to control the pressure behind the valve), or automatic control of pressure relief and stabilization (used to control the pressure before the valve).