What device in a sprinkler system consists of a threaded nipple, discharge orifice, heat actuated plug that drops out, and a deflector?

What device in a sprinkler system consists of a threaded nipple, discharge orifice, heat actuated plug that drops out, and a deflector?

• A. Sprinkler
• B. Flow Hydrant
• C. Test Hydrant
• D. Pressure Reducing Valve

Answer: (A)

Sprinkler heads are the automatic release devices in fire sprinkler systems. They screw into the piping with a threaded nipple, and inside there’s a small discharge orifice that controls flow. A heat-activated plug holds the water back until the surrounding temperatures reach a set point, at which point the plug drops out and water is released. The water then hits a deflector that shapes and distributes the spray across the protected area. Flow hydrants, test hydrants, and pressure‑reducing valves serve other system functions and do not have a heat‑activated plug and deflector like a sprinkler head.

Sprinkler heads are the automatic release devices in fire sprinkler systems. They screw into the piping with a threaded nipple, and inside there’s a small discharge orifice that controls flow. A heat-activated plug holds the water back until the surrounding temperatures reach a set point, at which point the plug drops out and water is released. The water then hits a deflector that shapes and distributes the spray across the protected area. Flow hydrants, test hydrants, and pressure‑reducing valves serve other system functions and do not have a heat‑activated plug and deflector like a sprinkler head.