Spence Strainers International, of Walden, New York, announces its cast iron, carbon steel and stainless steel flanged and wafer style silent check valves, ANSI Class 125, 150 and 300 lbs, for use in the HVAC, power, process, chemical, oil and gas, pulp and paper, metal and mining and water and waste industries. Designed for applications when silent operation and cost are of major concern, SSI silent check valves can be mounted vertically or horizontally to prevent flow reversal while eliminating water hammer and system surges normally associated with the sudden stoppage of a reverse flow. SSI Silent Flanged and Wafer Style Check Valves are available with bronze or stainless steel trim and metal to metal seats.