This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
American Railcar Industries manufactures the ARI 1626 vacuum relief for tank car service. Vacuum relief valves are used to equalize internal and external pressure and prevent the collapse of low-pressure, thin-shelled tanks. The ARI 1626 vacuum relief valve is available in either carbon or stainless steel and is AAR-approved.