The ZZYP-16K self-operated pre-valve pressure regulating valve is an automatic control device for pressure relief and stabilization (used for regulating pre-valve pressure), commonly referred to as a back pressure valve. It primarily senses changes in pre-valve pressure to adjust the opening of the valve core, thereby controlling the pre-valve pressure at the set point. The self-operated upstream pressure regulating valve consists of a control valve, an actuator, and a spring set to a predetermined pressure. It is suitable for non-corrosive liquids, gases, and steam, serving as an upstream pressure control device within system pipelines. When upstream pressure increases, the control valve opens.