High Cv Diaphragm Back Pressure Regulating Valve The JBDL Series is a diaphragm operated, balanced trim, back pressure regulator. The 1.95 Cv (1,69 Kv) offers increased flows across its 1200 psi (83 bar) inlet range, while the DEL-F soft seat provides ANSI Class VI shutoff. Five set spring ranges and three soft seal options offer the customer flexibility in a number of applications and environments. USDA and FDA approved soft goods available upon request. Regulate a variety of gases and liquids in compressor control Process pressure control where high flows and low pressures are required