FA72W-10P Vacuum Negative Pressure Safety Valve, 304 Stainless Steel Flanged Vacuum Inhalation Valve for Storage Tank Vacuum Protection

**FA72W-10P vacuum negative pressure safety valve**, spring loaded vacuum inhalation safety valve. 304 stainless steel body(P), W metal hard seal, PN10 pressure rating, flanged connection. Working principle opposite to normal pressure relief safety valve: when excessive vacuum forms inside vessel, valve automatically opens to intake ambient air to counteract negative pressure and prevent tank collapse. Valve re-seats tightly once vacuum returns safe level. Widely used for tanks with steam condensation or vacuum pumping, absorption tower, distillation tower, reactor and storage vessel. GB, ASME, DIN, BS, JIS flanges optional. Opening vacuum value customizable. Corrosion resistant for mild corrosive media, max working temperature ≤200℃.