The Swing-Flex check valve from Val-Matic has a nonclog design with only one moving part, and a short, 35-degree stroke provides fast closure to minimize slamming and slam-related surges. It is constructed of ductile iron with cold working pressures up to 250 psi, making it ideal for systems where traditional 125-pound valves were unsuitable and for those where surges may be a concern. The valves’ smooth, unrestricted flow path makes it a good choice for sludge and slurries. The valves are both NSF/ANSI 372 certified lead-free, NSF/ANSI 61 certified for drinking water, and are designed and manufactured to American Water Works Association C508. 630-941-7600; www.valmatic.com