Piston Operated Pressure Regulating Valve The 1/4" JRPH Series and JRPL Series are piston operated pressure regulators that offer excellent control at Cv's of 0.20 (0,17 Kv) and lower. There are six set ranges for the JRPH Series and two set ranges for the JRPL Series. Elastomer seals are used throughout with Buna-N, EPDM and Viton being standard options. USDA and FDA approved soft goods available upon request. General, corrosive and specialty gases, water, acids and oils High pressure application