4" Cast Carbon Steel Flanged Swing Check Valve - 150# - Raised FaceWarren Valve 4V3155C 8R0G 4" Cast Carbon Steel Flanged Swing Check Valve 150# Raised Face The Warren Valve 4V3155C 8R0G is a 4" cast carbon steel flanged swing check valve engineered to stop reverse flow in commercial and industrial piping systems. Its swing type disc opens with forward flow and closes automatically when flow stops, protecting pumps, compressors, and downstream equipment from backflow damage. Built to 150 lb class standards with a