400X flow control valve is a multi-functional valve that adopts high precision pilot mode to control flow.It is suitable for piping which needs to control the flow and pressure of distribution pipe, keep the predetermined flow unchanged, limit the excessive flow to a predetermined value, and lower the upstream high pressure appropriately, even if the upstream pressure of Wang Valve changes, it will not affect the downstream flow of main valve.The valve changes the principle of using orifice plate or purely mechanical small drainage area in the conventional throttle valve, and USES the related guide valve to minimize the loss of energy in the throttling process.The 400XA flow control valve can completely shut off flow to avoid loss in case of emergency.High control sensitivity, safety and reliability, easy debugging, long service life.