The VNA series is a universal 2 port valve used for controlling pneumatic systems or air-hydro circuits. Its balanced poppet design permits normal and reverse flow application.
effective area Q=11S P(P2+1.033).kg/h Equation in the domain of sonic flow Calculation by Cv factor Q=98.9Cv(p1+1.033).kg/h Calculation by effective area Q=5.51S(P1+1.033).kg/h 4.2-38 VND Flow Characteristics Water/VND 2 to 7 should be N.O. to suppress water hammer.