The U.S. Government requires the purchase and delivery of two new 18-inch Carbon Steel Globe Body Silent Check Valves to Lower Granite Dam. Quotes must be firm-fixed-price for new equipment only, with no remanufactured, refurbished, or gray market items accepted. The valves must meet strict technical specifications, including ASTM materials, a minimum pressure/temperature rating of 285 PSI at 100°F, ANSI Class 150 flanges, a cracking pressure below 1 PSI, and a metal-to-metal drop-tight seal. Mandatory physical dimensions include a 22.5-inch face-to-face, an overall diameter not exceeding 31 inches, a weight limit of 1,300 lbs, and specific Class 150 flange configurations. Performance is to occur at Lower Granite Dam; no budget or delivery timeline is specified.