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The Best Check Valve Quotes Ideas . Wafer check valves are becoming the preferred type of check valve for most applications, due to their compact design and relatively low cost. Compare check valve prices and specifications. Resilient Seated Swing Check Valve Flanged Table E from www.dewaterproducts.com.au Wafer check valves are becoming the preferred type of check valve for most applications, due to their compact design and relatively low cost. Wafer double disc, wafer silent & globe silent check valves. Min/norm/max flows flow coefficient or cv cv of 1 = 1 gallon per minute of 60° water with 1psi of pressure drop across the valve as control valve.