Non-Return Valve
Combustion shutoff and check valve that allows steam to pass out of the boiler, but a back flow of steam from a drop in pressure causes the valve to close.
Source: Johnston Boiler
Wikipedia: https://en.wikipedia.org/wiki/Check_valve
Combustion shutoff and check valve that allows steam to pass out of the boiler, but a back flow of steam from a drop in pressure causes the valve to close.
Source: Johnston Boiler
Wikipedia: https://en.wikipedia.org/wiki/Check_valve
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