Cornerstone Valve is a manufacturer of Custom Designed, Engineered Valve Solutions for a broad range of demanding applications. Our range of offerings includes Ball valves, Swing Check valves and Rotary Control valves for a vast spectrum of Liquid and High-pressure Gas media services. Over the past 31 years of operations, we established a market presence by deploying our expertise in providing customized, fit for purpose solutions meeting metal-seated, bubble tight leakage requirements. We serve Oil & Gas, Petrochemical, Aerospace and Power markets and have a massive installed base in well recognized global assets. We started as a supplier to the US Navy and have continued to supply to Defense and Aerospace applications. Many of our valve Solutions utilize metal-to-metal seating, solids proofing, and function reputably in the most challenging conditions such as Gas dehydration, sour services, and with loaded fluids. Delivered from and tagged with “Made in USA”, all of our raw materials are sourced domestically or from approved, vetted sources in Western Europe. We hold API 6D, API 6DSS, API 6A, API Q1 and ISO 9001-2000 certifications. We are 1 of 2 manufacturers in USA having API 6D-SS Monogramms for Subsea Valves. We are excited to carry on our traditions of success by offering Valve solutions for your most challenging needs. Proudly: "Our Valves Work!"