self-actuated pressure regulating valve is kind of energy-saving product. self-actuated pressure regulating valve is kind of energy-saving product ,it uses the change of the medium to regulate the pressure of input and output for constant pressure or reducing pressure automatically.this kind of valve has high control precision ,it is suitable for the ooccasion of high precision control . 1.Valve body, valve cover: ZG230-450, ZGlCr18Ni9Ti ZG0Cr18NI12Mo2Ti 2.Spool, 1Cr18NiTi