Pressure relief valve

Heating · Steam Controls · printed page 195 (PDF page 196)

Original page Sign in to save

Book index entries

Pressure Relief Valve – for Steam Heat Steam Heat – Pressure Relief Valve Steam Heat – Systems

Text in the illustration

the pressure relief valve is typically set to discharge steam pressure in excess of 15 PSI
radiator
supply main
equalizer pipe
returning condensate
F & T trap (steam trap)
main vent
Hartford Loop
wet return
burner
steam boiler
water
boiler water line
cross section

Generated explanation

The illustration shows a building cross section with a steam boiler below a radiator, connected by a steam supply main and condensate return piping. Red arrows indicate steam movement toward the radiator and along the supply main, while blue arrows indicate returning condensate. The return arrangement includes an F & T steam trap, main vent, wet return, equalizer pipe, and Hartford Loop near the boiler. A callout identifies the boiler pressure relief valve and states that it is typically set to discharge steam pressure in excess of 15 PSI. The boiler cutaway shows the water level and burner beneath the water-containing section.

Components

pressure relief valve steam boiler radiator supply main condensate return piping equalizer pipe F & T steam trap main vent Hartford Loop wet return burner boiler sight glass flue connector

Materials

metal piping

Related illustrations

0852

Pressure relief valve

· p. 143

Two simplified cross-sections show a boiler pressure relief valve in its closed and open states. On the left, spring force holds the poppet valve seated when water pressure is below the valve rating. On the right, pressu

0853

Pressure relief valve location

· p. 143

The illustration shows a boiler with a pressure relief valve mounted at its top and an exhaust flue extending upward. A dashed circle highlights the relief valve location. A discharge pipe connects to the valve and runs

1599

Temperature/pressure relief valve

· p. 279

The illustration shows a temperature/pressure relief valve installed near the top of an electric tank-type water heater, with a discharge pipe extending down to within 6 inches of the floor. Three simplified valve cross-

0854

Inspecting pressure relief valves

· p. 144

The illustration compares seven improper boiler pressure-relief valve conditions with a correct installation marked by a green check. Red prohibition symbols identify a missing discharge extension, a valve between the bo