Self-supporting regulating valve is a kind of equipment that can automatically control fluid flow and pressure. It has the characteristics of precise adjustment, sensitive response and wide control range. Its working principle is to achieve flow and pressure control through the opening and closing of the valve. When the system pressure or flow changes, the sensor will sense these changes and pass to the control valve, the control valve will adjust the opening of the valve in time, so that the system returns to the normal flow and pressure range.