Combined pressure reducing valve and pressure relief valve

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Pressure Relief Valve Combined Pressure Reducing Valve and Pressure Relief Valve on Boiler

Text in the illustration

exhaust flue
hot water
cold water return
pressure relief valve
pressure reducing valve
house water supply
boiler
if a pressure reducing valve and pressure relief valve are combined into one component, the pressure relief valve should be closer to the boiler

Generated explanation

The illustration shows a hot-water heating boiler with an exhaust flue, a hot-water supply riser, and a cold-water return pipe. The house water supply connects to the boiler return through a combined pressure reducing valve and pressure relief valve assembly. A dashed circle highlights the assembly, with the pressure relief valve positioned on the boiler side of the pressure reducing valve. A discharge pipe extends downward from the relief valve. The annotation specifies that the relief valve should be closer to the boiler when the two valves are combined into one component.

Components

boiler exhaust flue hot-water supply pipe cold-water return pipe house water supply pipe combined pressure reducing and pressure relief valve assembly pressure relief valve pressure reducing valve relief valve discharge pipe water supply shutoff valve