The U.S. Government requires the purchase and delivery of two (2) new, 18-inch Carbon Steel Globe Body Silent Check Valves to Lower Granite Dam. Valves must be designed to prevent flow reversal, surge, and water hammer, with a cast carbon steel body, stainless steel trim, and strict compliance with ASTM codes. Operational parameters include a minimum pressure/temperature rating of 285 PSI at 100°F, ANSI Class 150 flanges, and a cracking pressure under 1 PSI. Physical dimensions are mandatory and non-negotiable: face-to-face exactly 22.5 inches, overall diameter max 31 inches, and weight not exceeding 1,300 lbs. Quotes must be firm-fixed-price for new equipment only; remanufactured or refurbished items will not be accepted.