200X Adjustable Pressure Reducing Valve

principle: The medium enters cavity of the body to push the disc upward and ,at the same time,enter the upper cavity of the diaphragm via the external control pipe of the main valve,where the pressure is adjusted by the pilot valve.the pressure difference between the upper cavity of the lower one of the body makes teh disc move up and down so as to change the outlet pressure .when the pressure of both are identical ,the disc stay at one place and outlet pressure will be kept