CHECK VALVES (64-Series)- Cipriani Harrison’s Spring Check Valves are made from forged 304L and 316L stainless steel, are highly polished and come standard with a PTFE o-ring and gasket. These ‘non return valves' are self draining in the vertical position. The newly designed ribbed stainless disc resists water hammer, minimizes there resistance to flow and serves as a guide to the valve plug. Available in sizes 1" - 4" with Sanitary Clamp, Butt-Weld and I-Line end connections as standard. Multiple springs are offered to allow for flexibility in design and use.These valves are 3A authorized.