Watts 174A Bronze Boiler Relief Valve with Flood Sensor, 2 in., 150 psi

The Watts 174A (F278510) is a bronze pressure relief valve for hot water space heating boilers, set to open at 150 psi. It has 2 in. female NPTF inlet and outlet ports and comes fitted with a discharge line flood sensor using SentryPlus Alert technology.

The valve uses non-metallic disc-to-metal seating with non-mechanical seat-to-disc alignment, reseats automatically after relieving and has a test lever for routine checks. The flood sensor sits on the discharge drain line without restricting it and recognizes heavy discharge from the valve. Activating the sensor needs a separately purchased activation kit, which can tie into an existing building management system or the Watts Cellular Gateway.

Highlights

• 150 psi relief setpoint for hot water heating boilers

• 2 in. female NPTF inlet and outlet

• Bronze body with test lever and automatic reseating

• Nonrestrictive discharge line flood sensor with SentryPlus Alert

• Sensor activation requires a separate activation kit

Specifications

In the box

• Discharge line flood sensor