HPSL Series Valves provide superior leak integrity for critical gas/fluid systems with pressure ranges from vacuum to 3500 psig. FEATURES. BAR STOCK CONSTRUCTION. BODY OPTIONS: BRASS, NICKEL PLATED BRASS, 316L STAINLESS STEEL, MONEL® R405, OR NICKEL 200. SEAT: PCTFE. WETTED DIAPHRAGM: ELGILOY®. ACTUATOR HOUSING: NICKEL PLATED ALUMINUM. STEM: