APOLLO-FEED WATER REGULATOR SLDR/NPT 1/2" -35603BFSTC

The Apollo 35603BFSTC Feed Water Regulator is a combination boiler feed pressure regulator and dual-check backflow preventer designed for residential and commercial hot water boiler systems. Featuring a 1/2-inch solder union inlet and FNPT outlet, this bronze valve automatically maintains proper boiler fill pressure while protecting the potable water supply from backflow contamination. Factory preset to 15 PSI and adjustable from 10 to 25 PSI, the regulator includes a fast-fill purge lever, stainless steel internal strainer, and an in-line replaceable cartridge for simplified maintenance. Its durable bronze construction and ASSE-certified backflow protection make it ideal for closed-loop hydronic heating systems.

Cross References

• Apollo Valves — 35603BFSTC
• Apollo Valves — FFBSC-12
• Apollo Valves — 35-600-BF Series

Usage

The Apollo 35603BFSTC is installed on the cold-water supply feeding a closed-loop hydronic boiler system. It automatically regulates boiler make-up water pressure while preventing contaminated boiler water from flowing back into the potable water supply through its integrated dual-check backflow preventer. The fast-fill lever allows installers to rapidly fill and purge the system during commissioning or servicing. Typical applications include residential boilers, commercial hydronic heating systems, radiant floor heating, baseboard heating, fan coil units, and closed-loop HVAC systems where automatic pressure regulation and backflow protection are required.