I. Overview 
 400X flow control valve, is a high-precision multi-function pilot valves control the flow. Required for control of water distribution pipeline flow and pressure to maintain the same scheduled traffic, traffic restrictions will be too large in a predetermined value, and the upstream pressure appropriate decompression, even if the main valve upstream pressure changes, or will affect the flow downstream of the main valve. The throttle valve is changed to use regular plates, or purely mechanical reduction of energy losses in the throttling process. In case of emergency 400XA flow control valve can be completely cut-off traffic, to avoid losses. Control sensitivity, safety and reliability, debugging is simple, long service life. Widely used in industrial water supply, high-rise building water supply system directly from the pump to regulate the flow. Main valve part material as follows: 

 Part Name Material 
 Body, bonnet cast iron, cast steel, stainless steel 
 Bronze seat, stainless steel 
 Valve braided carbon steel, stainless steel + nitrile rubber 
 Stem aluminum bronze, chrome stainless steel 
 Nitrile rubber diaphragm 
 Diaphragm plate carbon steel, stainless steel 
 Stainless steel spring 


 Second, the main dimensions: 

 Nominal diameter size (mm) 
 DN (mm) L F1 F H1 H 
 20 150,136,292,247,342 
 25 160,136,292,247,342 
 32 180,136,292,247,342 
 40 200,155,330,278,395 
 50 203,155,330,278,395 
 65 216,165,350,298,405 
 80 241,175,365,313,430 
 100 270,195,410,350,510 
 125 300,220,455,365,560 
 150 330,230,475,420,585 
 200 400,255,530,450,675 
 250 480,300,623,470,730 
 300 550,340,700,490,760 
 350 622,415,840,526,840 
 400 685,430,880,570,910 
 450 750,430,880,570,910