CBL Hot Water Boiler Dual Control ValveAll bronze construction, inbuilt stainless steel strainer screen, phosphor bronze diaphragms, nickel chrome-bronze seat, renewable relief seat disc. Includes an inbuilt check valve to retard reverse flow and an inbuilt bypass for rapid filling, high pressure tests and system purging. Reduced pressure setting of 14 psi and relief setting of 28 psi for two-story buildings; slightly higher setting for 3-, 4- or 5-story buildings. Maximum inlet working pressure is 200 psi. Combines a pressure reducing and regulating valve, positive relief valve and bypass valve into one compact unit.
NOTE: FOR BACKFLOW PREVENTION OF BOILER WATER INTO THE POTABLE WATER SUPPLY LINE, INSTALL A BFP VALVE.
When installed in a boiler water supply line, assures automatic filling and maintains boiler pressure between 14 and 30 psi.