... 594, API 6DPRESSURE CLASSASME 125LB-1500LB(40A-1800A)BODY, PLATE MATERIALA126,A536,A216WCB,A351CF8,CF8M,CF3,CF3M,Duplex,Monel,CA15SPRING ... GenerationWater SystemGeneral Industry ADVANTAGEFace-to-face dimensions for Dual Plate Wafer Check Valves are about one fourth of a ... drop than Swing Check Valves because of little friction resistance.Dual Plate Wafer Check Valves are less expensive than Swing ...