CR-121 Two-Stage Pressure-Reducing Regulator

The CR-121 is a two stage pressure reducing regulator for calibration gas cylinders, for work where the outlet pressure has to stay constant as the cylinder empties rather than being delivered at a fixed flow. The two stages hold the setting steady across the whole cylinder life, and the outlet range is chosen at order from 0 to 1, 0 to 2, 0 to 4, 0 to 7 or 0 to 10 bar. The inlet is the 5/8 inch by 18 UN C10 cylinder thread rated to 83 bar, the outlet a 3/16 inch barb, and the stainless steel inlet gauge reads to 103 bar. Inside, the valve seat is PCTFE, the diaphragm 316 stainless steel and the seals Viton, with a brass piston, a nickel plated brass lock nut and an anodised aluminium control knob. This brass version is for non-reactive gases. It weighs 0.57 kg.