... (150-1500Lb) Nominal Diameter DN: 50-700mm(2-28aa) CST42Y Automatic Re-Circulating CCirculatin Nominal Pressure PN: 1.6-25MPa(150 ... -1500Lb) Nominal Diameter DN: 50-700mm(2-28") CST42Y Automatic Re-Circulating Control Valve (reflux valve) is installed at the outlet of ... , nickel, zirconium, Hastelloy, Monel, 316,310,304,WC6 and etc. Automatic Recirculation Control Valve (Return Valve)