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Farris Relief Valves, Series 3800, 2600 and 2700 Farris Relief Valves are ASME NB Certified for air, steam and water. These valve models are European CE Approved. They come in sizes 1 X 2-12 X 16. Series 3800 Farris Relief Valves actual orifice areas range from 0.15-109 square inches and can handle pressures from 20-6170 psig and handle -450° F-500° F. We also offer Farris valve parts, Worcester valve parts, and Worcester positioners. Contact us to find out more about our Farris and Worcester brands. You can also browse our catalog. The optional balanced bellows design isolates working parts and top-works from corrosion, and nullifies the effects of back pressure on valve performance. The "D" to "T" orifices of the Series 2600 Farris Relief Valves meet API Standard 526 covering orifice areas and center-to-face dimensions. Optional Farris Safety Valves construction materials include 316 stainless steel, Monel®, and Hastelloy® C. The Farris Safety Valves are available with Farris Valve Parts in compliance with NACE standards.