dpw-ct
New Member
I am in New York city where a check valve or back flow preventer (3/4 BBFP) is required for domestic heating systems. I have a indirect hotwater tank attached to a gas boiler. My question is - What order should the back flow preventer be installed in A or B. We have had no problems but neighbors with the same set up have had a lot of leaks from the check valve
A. city water>BBFP>expansion tank>hot water tank
or B. city water>expansion tank>BBFP>hot water tank
Note: BBFP Dual Check Valves with Intermediate Atmospheric Vent prevent the reverse flow of hot or cold polluted water from entering into the potable water supply. It consists of a brass body with stainless steel internal parts, integral strainer, and two durable, tight-sealing, rubber check valves. Designed for continuous pressure, non-health hazard applications in smaller supply lines, such as laboratory equipment, processing tanks, sterilizers, dairy equipment, and specifically for boiler feed lines. Minimum Working Pressure: 25psi (172kPa), Maximum Working Pressure: 175psi (12.06 bar)
A. city water>BBFP>expansion tank>hot water tank
or B. city water>expansion tank>BBFP>hot water tank
Note: BBFP Dual Check Valves with Intermediate Atmospheric Vent prevent the reverse flow of hot or cold polluted water from entering into the potable water supply. It consists of a brass body with stainless steel internal parts, integral strainer, and two durable, tight-sealing, rubber check valves. Designed for continuous pressure, non-health hazard applications in smaller supply lines, such as laboratory equipment, processing tanks, sterilizers, dairy equipment, and specifically for boiler feed lines. Minimum Working Pressure: 25psi (172kPa), Maximum Working Pressure: 175psi (12.06 bar)